1
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Luo H, Ouyang M, Li H, Nie S, Xu D, Zhao T. Concave Gold Nanocubes Exhibit Growth-Etching Behavior: Unexpected Morphological Transformations. Inorg Chem 2024; 63:13110-13116. [PMID: 38940642 DOI: 10.1021/acs.inorgchem.4c02346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/29/2024]
Abstract
Chemical equilibrium stands as a fundamental principle governing the dynamics of chemical systems. However, it may become intricate when it refers to nanomaterials because of their unique properties. Here, we invesitigated concave gold nanocubes (CGNs) subjected to an akaline Au3+/H2O2 solution, which exhibit both etching and growth in a monotonic solution. When CGNs were subjected to an increasingly alkaline Au3+/H2O2 solution, their dimensions increased from 107 to 199 nm and then decreased to 125 nm. Transmission electron microscopy (TEM) demonstrated that their morphology undergoes intricate alternations from concave to mutibranch and finally to concave again. Real-time ultraviolet-visible spectroscopy and time-dependent TEM also demonstrated reduction first and then oxidation in one solution. Among the nanomaterials, the obtained carpenterworm-like gold nanoparticles revealed the best catalytic performance in p-nitrophenol reduction by NaBH4, with a chemical rate that continues to increase until the reaction reaches completion. Growth leading to atomic dislocation, distortion, and exposure on nanoparticles and the redox of H2O2 plausibly account for the further etching due to the Ostwald ripening effect. Our study may spur more interest in the tuning of the properties, engineering, investigation, and design of new kinds of nanomaterials.
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Affiliation(s)
- Hongmei Luo
- National Engineering Laboratory for Rice and Byproducts Further Processing, Central South University of Forestry & Technology, Changsha 410004, China
| | - Min Ouyang
- National Engineering Laboratory for Rice and Byproducts Further Processing, Central South University of Forestry & Technology, Changsha 410004, China
| | - Hongchen Li
- National Engineering Laboratory for Rice and Byproducts Further Processing, Central South University of Forestry & Technology, Changsha 410004, China
| | - Saiqun Nie
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China
| | - Dong Xu
- National Engineering Laboratory for Rice and Byproducts Further Processing, Central South University of Forestry & Technology, Changsha 410004, China
| | - Tian Zhao
- School of Packaging and Materials Engineering, Hunan University of Technology, Zhuzhou 412007, China
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2
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Zhou D, Ge M, Wang Q, Sun J, Yao H, Deng Y, Xiao L, Wang J, Wei J. Gold Nanoparticles Confined in Mesoporous Bioactive Glass for Periodontitis Therapy. ACS Biomater Sci Eng 2024; 10:3883-3895. [PMID: 38700993 DOI: 10.1021/acsbiomaterials.4c00107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2024]
Abstract
Periodontitis is a chronic disease caused by bacterial infection and is characterized with alveolar bone resorption. Bone regeneration in periodontitis remains a critical challenge because bacterial infection induced an unfavorable microenvironment for osteogenesis. Therefore, it is necessary to design proper therapeutic platforms to control bacterial infection and promote bone regeneration. Herein, mesoporous bioactive glass (MBG) with different pore sizes (3.0, 4.3, and 12.3 nm) was used as an in situ reactor to confine the growth of gold nanoparticles (Au NPs), forming MBG@Au hybrids which combine the osteoconductivity of MBG and antibacterial properties of Au NPs. Upon near-infrared (NIR) irradiation, the MBG@Au NPs showed efficient antibacterial properties both in vitro and in vivo. Besides, the osteogenesis properties of MBG@Au also improved under NIR irradiation. Furthermore, the in vivo results demonstrated that MBG@Au can effectively promote alveolar bone regeneration and realize the healing of serious periodontitis.
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Affiliation(s)
- Dong Zhou
- School of Stomatology, Jiangxi Medical College, Nanchang University, Nanchang 330006, China
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, China
| | - Min Ge
- School of Stomatology, Jiangxi Medical College, Nanchang University, Nanchang 330006, China
- Jiangxi Province Key Laboratory of Oral Biomedicine, Nanchang 330006, China
- Jiangxi Province Clinical Research Center for Oral Diseases, Nanchang 330006, China
| | - QiHui Wang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry Chinese Academy of Sciences, Changchun 130022, China
| | - Jingru Sun
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry Chinese Academy of Sciences, Changchun 130022, China
| | - Haiyan Yao
- School of Stomatology, Jiangxi Medical College, Nanchang University, Nanchang 330006, China
- Jiangxi Province Key Laboratory of Oral Biomedicine, Nanchang 330006, China
- Jiangxi Province Clinical Research Center for Oral Diseases, Nanchang 330006, China
| | - Yunyun Deng
- School of Stomatology, Jiangxi Medical College, Nanchang University, Nanchang 330006, China
- Jiangxi Province Key Laboratory of Oral Biomedicine, Nanchang 330006, China
- Jiangxi Province Clinical Research Center for Oral Diseases, Nanchang 330006, China
| | - Lan Xiao
- School of Medicine and Dentistry, Griffith University, QLD 4222, Australia
| | - Jiaolong Wang
- School of Stomatology, Jiangxi Medical College, Nanchang University, Nanchang 330006, China
- Jiangxi Province Key Laboratory of Oral Biomedicine, Nanchang 330006, China
- Jiangxi Province Clinical Research Center for Oral Diseases, Nanchang 330006, China
| | - Junchao Wei
- School of Stomatology, Jiangxi Medical College, Nanchang University, Nanchang 330006, China
- School of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, China
- Jiangxi Province Key Laboratory of Oral Biomedicine, Nanchang 330006, China
- Jiangxi Province Clinical Research Center for Oral Diseases, Nanchang 330006, China
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3
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Daly R, Narayan T, Diaz F, Shao H, Gutierrez Moreno JJ, Nolan M, O'Riordan A, Lovera P. Electrochemical synthesis of 2D-silver nanodendrites functionalized with cyclodextrin for SERS-based detection of herbicide MCPA. NANOTECHNOLOGY 2024; 35:285704. [PMID: 38522104 DOI: 10.1088/1361-6528/ad373c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Accepted: 03/24/2024] [Indexed: 03/26/2024]
Abstract
Surface enhanced Raman spectroscopy (SERS) is a powerful analytical technique that has found application in the trace detection of a wide range of contaminants. In this paper, we report on the fabrication of 2D silver nanodendrites, on silicon chips, synthesized by electrochemical reduction of AgNO3at microelectrodes. The formation of nanodendrites is tentatively explained in terms of electromigration and diffusion of silver ions. Electrochemical characterization suggests that the nanodendrites do not stay electrically connected to the microelectrode. The substrates show SERS activity with an enhancement factor on the order of 106. Density functional theory simulations were carried out to investigate the suitability of the fabricated substrate for pesticide monitoring. These substrates can be functionalized with cyclodextrin macro molecules to help with the detection of molecules with low affinity with silver surfaces. A proof of concept is demonstrated with the detection of the herbicide 2-methyl-4-chlorophenoxyacetic acid (MCPA).
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Affiliation(s)
- Robert Daly
- Nanotechnology Group, Tyndall National Institute-University College Cork, T12 R5CP Cork, Ireland
| | - Tarun Narayan
- Nanotechnology Group, Tyndall National Institute-University College Cork, T12 R5CP Cork, Ireland
| | - Fernando Diaz
- Nanotechnology Group, Tyndall National Institute-University College Cork, T12 R5CP Cork, Ireland
| | - Han Shao
- Nanotechnology Group, Tyndall National Institute-University College Cork, T12 R5CP Cork, Ireland
| | - Jose Julio Gutierrez Moreno
- Materials Modelling for Devices Group, Tyndall National Institute, Lee Maltings, UCC, T12 R5CP Cork, Ireland
| | - Michael Nolan
- Materials Modelling for Devices Group, Tyndall National Institute, Lee Maltings, UCC, T12 R5CP Cork, Ireland
| | - Alan O'Riordan
- Nanotechnology Group, Tyndall National Institute-University College Cork, T12 R5CP Cork, Ireland
| | - Pierre Lovera
- Nanotechnology Group, Tyndall National Institute-University College Cork, T12 R5CP Cork, Ireland
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4
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Logan N, Cao C, Freitag S, Haughey SA, Krska R, Elliott CT. Advancing Mycotoxin Detection in Food and Feed: Novel Insights from Surface-Enhanced Raman Spectroscopy (SERS). ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2309625. [PMID: 38224595 DOI: 10.1002/adma.202309625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 12/20/2023] [Indexed: 01/17/2024]
Abstract
The implementation of low-cost and rapid technologies for the on-site detection of mycotoxin-contaminated crops is a promising solution to address the growing concerns of the agri-food industry. Recently, there have been significant developments in surface-enhanced Raman spectroscopy (SERS) for the direct detection of mycotoxins in food and feed. This review provides an overview of the most recent advancements in the utilization of SERS through the successful fabrication of novel nanostructured materials. Various bottom-up and top-down approaches have demonstrated their potential in improving sensitivity, while many applications exploit the immobilization of recognition elements and molecular imprinted polymers (MIPs) to enhance specificity and reproducibility in complex matrices. Therefore, the design and fabrication of nanomaterials is of utmost importance and are presented herein. This paper uncovers that limited studies establish detection limits or conduct validation using naturally contaminated samples. One decade on, SERS is still lacking significant progress and there is a disconnect between the technology, the European regulatory limits, and the intended end-user. Ongoing challenges and potential solutions are discussed including nanofabrication, molecular binders, and data analytics. Recommendations to assay design, portability, and substrate stability are made to help improve the potential and feasibility of SERS for future on-site agri-food applications.
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Affiliation(s)
- Natasha Logan
- National Measurement Laboratory, Centre of Excellence in Agriculture and Food Integrity, Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, UK
| | - Cuong Cao
- National Measurement Laboratory, Centre of Excellence in Agriculture and Food Integrity, Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, UK
- Material and Advanced Technologies for Healthcare, Queen's University Belfast, 18-30 Malone Road, Belfast, BT9 5BN, UK
| | - Stephan Freitag
- Department of Agrobiotechnology IFA-Tulln, Institute of Bioanalytics and Agro-Metabolomics, University of Natural Resources and Life Sciences, Konrad-Lorenz-Str. 20, Tulln, 3430, Vienna, Austria
- FFoQSI GmbH - Austrian Competence Centre for Feed and Food Quality, Safety and Innovation, Technopark 1C, Tulln, 3430, Austria
| | - Simon A Haughey
- National Measurement Laboratory, Centre of Excellence in Agriculture and Food Integrity, Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, UK
| | - Rudolf Krska
- National Measurement Laboratory, Centre of Excellence in Agriculture and Food Integrity, Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, UK
- Department of Agrobiotechnology IFA-Tulln, Institute of Bioanalytics and Agro-Metabolomics, University of Natural Resources and Life Sciences, Konrad-Lorenz-Str. 20, Tulln, 3430, Vienna, Austria
- FFoQSI GmbH - Austrian Competence Centre for Feed and Food Quality, Safety and Innovation, Technopark 1C, Tulln, 3430, Austria
| | - Christopher T Elliott
- National Measurement Laboratory, Centre of Excellence in Agriculture and Food Integrity, Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, 19 Chlorine Gardens, Belfast, BT9 5DL, UK
- School of Food Science and Technology, Faculty of Science and Technology, Thammasat University, 99 Mhu 18, Khong Luang, Pathum Thani, 12120, Thailand
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5
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Xie J, Zhang B, Gui X, Ma J, Chu J, Guo Z, Wang W, Qin W, Qin Z, Yao H, Bai J. Planting gold nanoflower for harvesting reproducible SERS substrate. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 308:123793. [PMID: 38141506 DOI: 10.1016/j.saa.2023.123793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 11/21/2023] [Accepted: 12/16/2023] [Indexed: 12/25/2023]
Abstract
Surface-enhanced Raman scattering (SERS) is an ultrasensitive analytical method which has been applied in many fields, and the reproducibility of the substrate is important for reliable SERS analysis. In present work, an innovative method inspired by the flower planting process is put forward to acquire gold nanoflower (AuNF) SERS substrate. Three steps (digging holes, sowing the gold nanoseeds and seeds grow into gold nanoflowers) are included in the substrate fabrication process, and the influence of preparing conditions (like reacting time and Na3Au(SO3)2 concentration) on the substrate morphology and SERS performance are investigated. The acquired AuNF substrate not only exhibits good SERS performance but also possesses excellent reproducibility while being used to detect the rhodamine 6G (R6G) molecular. The relative standard deviation (RSD) of Raman signals among substrates acquired in distinct batches (substrate-to-substrate) is as low as 6.67 %. Since the AuNF substrate is prepared by the wet chemistry route based on seed-mediated growth and there are no expensive reagents or complicated process used, the new process to obtain AuNF substrate is cost-effective and easy to scale up.
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Affiliation(s)
- Jianjun Xie
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Baitong Zhang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Xiaoyu Gui
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jingyi Ma
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jian Chu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China; School of Nuclear Science and Technology, Lanzhou University, Lanzhou, 730000, China
| | - Zaichao Guo
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Wentao Wang
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China
| | - Wei Qin
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhi Qin
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, 516000, China
| | - Huijun Yao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, 516000, China.
| | - Jing Bai
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Advanced Energy Science and Technology Guangdong Laboratory, Huizhou, 516000, China.
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6
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Khlebtsov BN, Burov AM, Zarkov SV, Khlebtsov NG. Surface-enhanced Raman scattering from Au nanorods, nanotriangles, and nanostars with tuned plasmon resonances. Phys Chem Chem Phys 2023; 25:30903-30913. [PMID: 37955312 DOI: 10.1039/d3cp04541b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2023]
Abstract
Electromagnetic theory predicts that the optimal value of the localized plasmon resonance (LPR) wavelength for the maximal SERS enhancement factor (EF) is half the sum of the laser and Raman wavelengths. For small Raman shifts, the theoretical EF scales as the fourth power of the local field. However, experimental data often disagree with these theoretical conclusions, leaving the question of choosing the optimal plasmon resonance for the maximal SERS signal unresolved. Here, we present experimental data for gold nanorods (AuNRs), gold nanotriangles (AuNTs), and gold nanostars (AuNSTs) simulating 1D, 2D, and 3D plasmonic nanostructures, respectively. The LPR wavelengths were tuned by chemical etching within 580-1020 nm at a constant concentration of the particles. The particles were functionalized with Cy7.5 and NBT, and the dependence of the intensity at 940 cm-1 (Cy7.5) and 1343 cm-1 (NBT) on the LPR wavelength was examined for laser wavelengths of 633 nm and 785 nm. The electromagnetic SERS EFs were calculated by averaging the product of the local field intensities at the laser and Raman wavelengths over the particle surface and their random orientations. The calculated SERS plasmonic profiles were redshifted compared to the laser wavelength. For 785 nm excitation, the calculated EFs were five to seven times higher than those for 633 nm excitation. With AuNR@Cy7.5 and AuNT@ Cy7.5, the experimental SERS was 35-fold stronger than it was with NBT-functionalized particles, but with AuNST@Cy7.5 and AuNST@NBT, the SERS responses were similar. With all nanoparticles tested, the SERS plasmonic profiles after 785 nm excitation were slightly blue-shifted, as compared with the laser wavelength, possibly owing to the inner filter effect. After 633 nm excitation, the SERS profiles were red-shifted, in agreement with EM theory. In all cases, the plasmonic EF profiles were much broadened compared to the calculated ones and did not follow the four-power law.
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Affiliation(s)
- Boris N Khlebtsov
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Saratov Scientific Centre of the Russian Academy of Sciences, 13 Prospekt Entuziastov, Saratov 410049, Russia.
| | - Andrey M Burov
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Saratov Scientific Centre of the Russian Academy of Sciences, 13 Prospekt Entuziastov, Saratov 410049, Russia.
| | - Sergey V Zarkov
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Saratov Scientific Centre of the Russian Academy of Sciences, 13 Prospekt Entuziastov, Saratov 410049, Russia.
| | - Nikolai G Khlebtsov
- Institute of Biochemistry and Physiology of Plants and Microorganisms, Saratov Scientific Centre of the Russian Academy of Sciences, 13 Prospekt Entuziastov, Saratov 410049, Russia.
- Saratov State University, 83 Ulitsa Astrakhanskaya, Saratov 410012, Russia
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7
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Di L, Thomas A, Switala L, Kalikasingh K, Lapping S, Nayak L, Maiseyeu A. Surface Geometry of Cargo-less Gold Nanoparticles Is a Driving Force for Selective Targeting of Activated Neutrophils to Reduce Thrombosis in Antiphospholipid Syndrome. NANO LETTERS 2023; 23:9690-9696. [PMID: 37884274 PMCID: PMC10636870 DOI: 10.1021/acs.nanolett.3c02075] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 10/11/2023] [Accepted: 10/12/2023] [Indexed: 10/28/2023]
Abstract
Antiphospholipid syndrome (APS) is an autoimmune disease characterized by recurrent arterial, venous, and microvascular thrombosis where activated neutrophils play a determinant role. However, neutrophils are challenging to target given their short lifespan in circulation and spontaneous activation. Screening of a small library of gold nanoparticles (AuNPs) led to the discovery of a formulation capable of targeting activated neutrophil attachment and has demonstrated that star-shaped, anti-PSGL-1-antibody-coated AuNPs (aPSGL-1-AuNPs) were more efficacious compared with other shapes of AuNPs. Our findings further revealed an exciting and safe targeting mode toward activated neutrophils in the APS mouse model induced by human-patient-derived antiphospholipid IgGs. Our studies demonstrate that targeting is dependent on the specific topographical features of the highly segregated PSGL-1 on the activated neutrophil surface for which a high affinity shape-driven nanomedicine can be designed and implemented. As such, star-shaped aPSGL-1-AuNPs serve as a promising nanoimmunotherapy for immunothrombosis associated with neutrophil adhesion in APS.
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Affiliation(s)
- Lin Di
- Department
of Biomedical Engineering, Case Western
Reserve University School of Engineering, Cleveland, Ohio 44106, United States
- Cardiovascular
Research Institute, Case Western Reserve
University School of Medicine, Cleveland, Ohio 44106, United States
| | - Asha Thomas
- Cardiovascular
Research Institute, Case Western Reserve
University School of Medicine, Cleveland, Ohio 44106, United States
- Division
of Hematology and Oncology, University Hospitals
Cleveland Medical Center, Cleveland, Ohio 44106, United States
| | - Lauren Switala
- Department
of Biomedical Engineering, Case Western
Reserve University School of Engineering, Cleveland, Ohio 44106, United States
- Cardiovascular
Research Institute, Case Western Reserve
University School of Medicine, Cleveland, Ohio 44106, United States
| | - Kenneth Kalikasingh
- Cardiovascular
Research Institute, Case Western Reserve
University School of Medicine, Cleveland, Ohio 44106, United States
- Division
of Hematology and Oncology, University Hospitals
Cleveland Medical Center, Cleveland, Ohio 44106, United States
| | - Stephanie Lapping
- Cardiovascular
Research Institute, Case Western Reserve
University School of Medicine, Cleveland, Ohio 44106, United States
- Division
of Hematology and Oncology, University Hospitals
Cleveland Medical Center, Cleveland, Ohio 44106, United States
| | - Lalitha Nayak
- Cardiovascular
Research Institute, Case Western Reserve
University School of Medicine, Cleveland, Ohio 44106, United States
- Division
of Hematology and Oncology, University Hospitals
Cleveland Medical Center, Cleveland, Ohio 44106, United States
| | - Andrei Maiseyeu
- Department
of Biomedical Engineering, Case Western
Reserve University School of Engineering, Cleveland, Ohio 44106, United States
- Cardiovascular
Research Institute, Case Western Reserve
University School of Medicine, Cleveland, Ohio 44106, United States
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8
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Yamada R, Kimura R, Kuwahara S. Depletion force optimization for high-purity gold nanotriangles prepared using different growth methods. RSC Adv 2023; 13:32143-32149. [PMID: 37928845 PMCID: PMC10620599 DOI: 10.1039/d3ra05955c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 10/26/2023] [Indexed: 11/07/2023] Open
Abstract
A homogeneous structural distribution in metal nanoparticle is commonly required for their application, and despite high-yield growth techniques, unavoidable structural heterogeneity remains a concern in metal nanoparticle synthesis. Gold nanotriangles (AuNTs) were synthesized using seed-mediated and seedless growth methods. Recent advancements in high-yield synthesis processes have enabled easy handling of AuNTs, which exhibit unique localized surface plasmon resonance characteristics due to their anisotropic triangular form. The flocculation and subsequent precipitation technique was used to purify AuNTs of different sizes synthesized using seed-mediated and seedless growth methods. The optimal conditions for obtaining high-purity AuNTs were explored by introducing a high concentration of cetyltrimethylammonium chloride. Additionally, the depletion force necessary for achieving high-purity AuNTs was calculated to reveal variations in the required depletion forces for AuNTs synthesized using different growth techniques. The alternations in the size distribution of AuNTs during the flocculation step were tracked using dynamic light scattering, and the surface charge of AuNTs synthesized through different growth methods was evaluated by ζ-potential. The high purity of the AuNTs produced using the seedless growth method required a larger depletion force than the seed-mediated grown AuNTs. The difference in the required depletion forces results from the difference in the electrostatic forces caused by the different growth methods.
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Affiliation(s)
- Ryuichi Yamada
- Department of Chemistry, Faculty of Science, Toho University Funabashi Chiba 274-8510 Japan
| | - Ryusei Kimura
- Department of Chemistry, Faculty of Science, Toho University Funabashi Chiba 274-8510 Japan
| | - Shota Kuwahara
- Department of Chemistry, Faculty of Science, Toho University Funabashi Chiba 274-8510 Japan
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9
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P N N, Mehla S, Begum A, Chaturvedi HK, Ojha R, Hartinger C, Plebanski M, Bhargava SK. Smart Nanozymes for Cancer Therapy: The Next Frontier in Oncology. Adv Healthc Mater 2023; 12:e2300768. [PMID: 37392379 DOI: 10.1002/adhm.202300768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 05/18/2023] [Indexed: 07/03/2023]
Abstract
Nanomaterials that mimic the catalytic activity of natural enzymes in the complex biological environment of the human body are called nanozymes. Recently, nanozyme systems have been reported with diagnostic, imaging, and/or therapeutic capabilities. Smart nanozymes strategically exploit the tumor microenvironment (TME) by the in situ generation of reactive species or by the modulation of the TME itself to result in effective cancer therapy. This topical review focuses on such smart nanozymes for cancer diagnosis, and therapy modalities with enhanced therapeutic effects. The dominant factors that guide the rational design and synthesis of nanozymes for cancer therapy include an understanding of the dynamic TME, structure-activity relationships, surface chemistry for imparting selectivity, and site-specific therapy, and stimulus-responsive modulation of nanozyme activity. This article presents a comprehensive analysis of the subject including the diverse catalytic mechanisms of different types of nanozyme systems, an overview of the TME, cancer diagnosis, and synergistic cancer therapies. The strategic application of nanozymes in cancer treatment can well be a game changer in future oncology. Moreover, recent developments may pave the way for the deployment of nanozyme therapy into other complex healthcare challenges, such as genetic diseases, immune disorders, and ageing.
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Affiliation(s)
- Navya P N
- Centre for Advanced Materials and Industrial Chemistry, School of Science, STEM College, RMIT University, Melbourne, 3000, Australia
| | - Sunil Mehla
- Centre for Advanced Materials and Industrial Chemistry, School of Science, STEM College, RMIT University, Melbourne, 3000, Australia
| | - Amrin Begum
- Centre for Advanced Materials and Industrial Chemistry, School of Science, STEM College, RMIT University, Melbourne, 3000, Australia
| | - Harit K Chaturvedi
- Head Surgical Oncologist, Max Institute of Cancer Care, Delhi, 110024, India
| | - Ruchika Ojha
- Centre for Advanced Materials and Industrial Chemistry, School of Science, STEM College, RMIT University, Melbourne, 3000, Australia
| | - Christian Hartinger
- School of Chemical Sciences, The University of Auckland, Auckland 1142, Private Bag, 92019, New Zealand
| | - Magdalena Plebanski
- Cancer, Ageing and Vaccines Research Group, School of Health and Biomedical Sciences, STEM College, RMIT University, Melbourne, 3000, Australia
| | - Suresh K Bhargava
- Centre for Advanced Materials and Industrial Chemistry, School of Science, STEM College, RMIT University, Melbourne, 3000, Australia
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10
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Xie X, van Huis MA, van Blaaderen A. Morphology-Controlled Growth of Crystalline Ag-Pt-Alloyed Shells onto Au Nanotriangles and Their Plasmonic Properties. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2023; 127:16052-16060. [PMID: 37609379 PMCID: PMC10441576 DOI: 10.1021/acs.jpcc.3c02897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 07/15/2023] [Indexed: 08/24/2023]
Abstract
The surface plasmon resonance of noble-metal nanoparticles depends on nanoscale size, morphology, and composition, and provides great opportunities for applications in biomedicine, optoelectronics, (photo)catalysis, photovoltaics, and sensing. Here, we present the results of synthesizing ternary metallic or trimetallic nanoparticles, Au nanotriangles (Au NTs) with crystalline Ag-Pt alloyed shells, the morphology of which can be adjusted from a yolk-shell to a core-shell structure by changing the concentration of AgNO3 or the concentration of Au NT seeds, while the shell thickness can be precisely controlled by adjusting the concentration of K2PtCl4. By monitoring the growth process with UV-vis spectra and scanning transmission electron microscopy (STEM), the shells on the Au NT-Ag-Pt yolk-shell nanoparticles were found to grow via a galvanic replacement synergistic route. The plasmonic properties of the as-synthesized nanoparticles were investigated by optical absorbance measurements.
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Affiliation(s)
| | - Marijn A. van Huis
- Soft Condensed Matter, Debye
Institute for Nanomaterials Science, Utrecht
University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
| | - Alfons van Blaaderen
- Soft Condensed Matter, Debye
Institute for Nanomaterials Science, Utrecht
University, Princetonplein 5, 3584 CC Utrecht, The Netherlands
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11
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Podlesnaia E, Gerald Inangha P, Vesenka J, Seyring M, Hempel HJ, Rettenmayr M, Csáki A, Fritzsche W. Microfluidic-Generated Seeds for Gold Nanotriangle Synthesis in Three or Two Steps. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2204810. [PMID: 36855325 DOI: 10.1002/smll.202204810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 01/23/2023] [Indexed: 06/02/2023]
Abstract
Nanoparticle synthesis has drawn great attention in the last decades. The study of crystal growth mechanisms and optimization of the existing methods lead to the increasing accessibility of nanomaterials, such as gold nanotriangles which have great potential in the fields of plasmonics and catalysis. To form such structures, a careful balance of reaction parameters has to be maintained. Herein, a novel synthesis of gold nanotriangles from seeds derived with a micromixer, which provides a highly efficient mixing and simple parameter control is reported. The impact of the implemented reactor on the primary seed characteristics is investigated. The following growth steps are studied to reveal the phenomena affecting the shape yield. The use of microfluidic seeds led to the formation of well-defined triangles with a narrower size distribution compared to the entirely conventional batch synthesis. A shortened two-step procedure for the formation of triangles directly from primary seeds, granting an express but robust synthesis is further described. Moreover, the need for a thorough study of seed crystallinity depending on the synthesis conditions, which - together with additional parameter optimization - will bring a new perspective to the use of micromixers which are promising for scaling up nanomaterial production is highlighted.
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Affiliation(s)
- Ekaterina Podlesnaia
- Department of Nanobiophotonics, Leibniz Institute of Photonic Technology (Leibniz-IPHT), Albert-Einstein-Straße 9, 07745, Jena, Germany
| | - Princess Gerald Inangha
- Department of Nanobiophotonics, Leibniz Institute of Photonic Technology (Leibniz-IPHT), Albert-Einstein-Straße 9, 07745, Jena, Germany
| | - James Vesenka
- Department of Nanobiophotonics, Leibniz Institute of Photonic Technology (Leibniz-IPHT), Albert-Einstein-Straße 9, 07745, Jena, Germany
- School of Mathematical and Physical Sciences, University of New England, 11 Hills Beach Road, Biddeford, ME, 04005, USA
| | - Martin Seyring
- Department of Metallic Materials, Otto Schott Institute of Materials Research (OSIM), Friedrich Schiller University (FSU), Löbdergraben 32, 07743, Jena, Germany
- Faculty of Electrical Engineering, Schmalkalden University of Applied Sciences, Blechhammer 4-9, 98574, Schmalkalden, Germany
| | - Hans-Jürgen Hempel
- Department of Metallic Materials, Otto Schott Institute of Materials Research (OSIM), Friedrich Schiller University (FSU), Löbdergraben 32, 07743, Jena, Germany
| | - Markus Rettenmayr
- Department of Metallic Materials, Otto Schott Institute of Materials Research (OSIM), Friedrich Schiller University (FSU), Löbdergraben 32, 07743, Jena, Germany
| | - Andrea Csáki
- Department of Nanobiophotonics, Leibniz Institute of Photonic Technology (Leibniz-IPHT), Albert-Einstein-Straße 9, 07745, Jena, Germany
| | - Wolfgang Fritzsche
- Department of Nanobiophotonics, Leibniz Institute of Photonic Technology (Leibniz-IPHT), Albert-Einstein-Straße 9, 07745, Jena, Germany
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12
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Chowdhury AA, Manohar N, Witek MA, Woldeyes MA, Majumdar R, Qian KK, Kimball WD, Xu S, Lanzaro A, Truskett TM, Johnston KP. Subclass Effects on Self-Association and Viscosity of Monoclonal Antibodies at High Concentrations. Mol Pharm 2023. [PMID: 37191356 DOI: 10.1021/acs.molpharmaceut.3c00023] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The effects of a subclass of monoclonal antibodies (mAbs) on protein-protein interactions, formation of reversible oligomers (clusters), and viscosity (η) are not well understood at high concentrations. Herein, we quantify a short-range anisotropic attraction between the complementarity-determining region (CDR) and CH3 domains (KCDR-CH3) for vedolizumab IgG1, IgG2, or IgG4 subclasses by fitting small-angle X-ray scattering (SAXS) structure factor Seff(q) data with an extensive library of 12-bead coarse-grained (CG) molecular dynamics simulations. The KCDR-CH3 bead attraction strength was isolated from the strength of long-range electrostatic repulsion for the full mAb, which was determined from the theoretical net charge and a scaling parameter ψ to account for solvent accessibility and ion pairing. At low ionic strength (IS), the strongest short-range attraction (KCDR-CH3) and consequently the largest clusters and highest η were observed with IgG1, the subclass with the most positively charged CH3 domain. Furthermore, the trend in KCDR-CH3 with the subclass followed the electrostatic interaction energy between the CDR and CH3 regions calculated with the BioLuminate software using the 3D mAb structure and molecular interaction potentials. Whereas the equilibrium cluster size distributions and fractal dimensions were determined from fits of SAXS with the MD simulations, the degree of cluster rigidity under flow was estimated from the experimental η with a phenomenological model. For the systems with the largest clusters, especially IgG1, the inefficient packing of mAbs in the clusters played the largest role in increasing η, whereas for other systems, the relative contribution from stress produced by the clusters was more significant. The ability to relate η to short-range attraction from SAXS measurements at high concentrations and to theoretical characterization of electrostatic patches on the 3D surface is not only of fundamental interest but also of practical value for mAb discovery, processing, formulation, and subcutaneous delivery.
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Affiliation(s)
- Amjad A Chowdhury
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Neha Manohar
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Marta A Witek
- Eli Lilly and Company, Indianapolis, Indiana 46225, United States
| | | | - Ranajoy Majumdar
- Eli Lilly and Company, Indianapolis, Indiana 46225, United States
| | - Ken K Qian
- Eli Lilly and Company, Indianapolis, Indiana 46225, United States
| | - William D Kimball
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Shifeng Xu
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Alfredo Lanzaro
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Thomas M Truskett
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
- Department of Physics, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Keith P Johnston
- McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States
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13
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Zorlu T, Correa-Duarte MA, Alvarez-Puebla RA. Composite nanoparticle-metal-organic frameworks for SERS sensing. J Chem Phys 2023; 158:2887549. [PMID: 37125707 DOI: 10.1063/5.0144695] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 04/12/2023] [Indexed: 05/02/2023] Open
Abstract
In recent years, metal-organic frameworks, in general, and zeolitic imidazolate frameworks, in special, had become popular due to their large surface area, pore homogeneity, and easy preparation and integration with plasmonic nanoparticles to produce optical sensors. Herein, we summarize the late advances in the use of these hybrid composites in the field of surface-enhanced Raman scattering and their future perspectives.
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Affiliation(s)
- Tolga Zorlu
- Department of Physical and Inorganic Chemistry, Universitat Rovira i Virgili, Carrer de Marcel∙lí Domingo s/n, 43007 Tarragona, Spain
- Department of Physical Chemistry, Center for Biomedical Research (CINBIO), Southern Galicia Institute of Health Research (IISGS) and Biomedical Research Networking Center for Mental Health (CIBERSAM), Universidade de Vigo, 36310 Vigo, Spain
| | - Miguel A Correa-Duarte
- Department of Physical Chemistry, Center for Biomedical Research (CINBIO), Southern Galicia Institute of Health Research (IISGS) and Biomedical Research Networking Center for Mental Health (CIBERSAM), Universidade de Vigo, 36310 Vigo, Spain
| | - Ramon A Alvarez-Puebla
- Department of Physical and Inorganic Chemistry, Universitat Rovira i Virgili, Carrer de Marcel∙lí Domingo s/n, 43007 Tarragona, Spain
- ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain
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14
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Chandran N, Janardhanan P, Bayal M, Pilankatta R, Nair SS. Development of PEGylated Cu nanoclusters: A nontoxic, multifunctional colloidal system for bioimaging and peroxide sensing. Biochim Biophys Acta Gen Subj 2023; 1867:130372. [PMID: 37127204 DOI: 10.1016/j.bbagen.2023.130372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 04/21/2023] [Accepted: 04/26/2023] [Indexed: 05/03/2023]
Abstract
This study introduces the development of blue-emitting colloidal Cu NCs through a novel and easy PEGylation method using different functional groups, including -SH and -COOH. The surface functionalization controls the size, cellular toxicity, and emission properties of Cu NCs. The combination of PEG, thiol, and carboxylic groups protects the particle surface from aggregation and oxidation. Among the samples, CAGP (Surface modified Cu NCs with -SH-COOH-PEG combination) emerges as an amazing candidate with the lowest toxicity and enhanced blue emission properties. The bright blue fluorescence emission from Hela cells after treatment with CAGP demonstrated this property. It also has excellent peroxide sensing potential, with a detection limit of 1.4 μM. Because of their excellent bioimaging and peroxide sensing properties, these Cu NCs could be a promising candidate for cellular oxidative stress sensing applications with high clinical relevance.
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Affiliation(s)
- Neeli Chandran
- Department of Physics, Central University of Kerala, Periye, Kasaragod, Kerala 671316, India
| | - Prajit Janardhanan
- Department of Biochemistry and Molecular Biology, Central University of Kerala, Periye, Kasaragod, Kerala 671316, India
| | - Manikanta Bayal
- Department of Physics, Central University of Kerala, Periye, Kasaragod, Kerala 671316, India
| | - Rajendra Pilankatta
- Department of Biochemistry and Molecular Biology, Central University of Kerala, Periye, Kasaragod, Kerala 671316, India.
| | - Swapna S Nair
- Department of Physics, Central University of Kerala, Periye, Kasaragod, Kerala 671316, India.
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15
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Charconnet M, Korsa MT, Petersen S, Plou J, Hanske C, Adam J, Seifert A. Generalization of Self-Assembly Toward Differently Shaped Colloidal Nanoparticles for Plasmonic Superlattices. SMALL METHODS 2023; 7:e2201546. [PMID: 36807876 DOI: 10.1002/smtd.202201546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 01/18/2023] [Indexed: 06/18/2023]
Abstract
Periodic superlattices of noble metal nanoparticles have demonstrated superior plasmonic properties compared to randomly distributed plasmonic arrangements due to near-field coupling and constructive far-field interference. Here, a chemically driven, templated self-assembly process of colloidal gold nanoparticles is investigated and optimized, and the technology is extended toward a generalized assembly process for variously shaped particles, such as spheres, rods, and triangles. The process yields periodic superlattices of homogenous nanoparticle clusters on a centimeter scale. Electromagnetically simulated absorption spectra and corresponding experimental extinction measurements demonstrate excellent agreement in the far-field for all particle types and different lattice periods. The electromagnetic simulations reveal the specific nano-cluster near-field behavior, predicting the experimental findings provided by surface-enhanced Raman scattering measurements. It turns out that periodic arrays of spherical nanoparticles produce higher surface-enhanced Raman scattering enhancement factors than particles with less symmetry as a result of very well-defined strong hotspots.
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Affiliation(s)
- Mathias Charconnet
- CIC nanoGUNE BRTA, San Sebastián, 20018, Spain
- CIC biomaGUNE, Basque Research and Technology Alliance (BRTA), San Sebastián, 20014, Spain
| | - Matiyas Tsegay Korsa
- University of Southern Denmark, SDU Centre for Photonics Engineering, Mads Clausen Institute, Odense, 5230, Denmark
| | - Søren Petersen
- University of Southern Denmark, SDU Centre for Photonics Engineering, Mads Clausen Institute, Odense, 5230, Denmark
| | - Javier Plou
- CIC biomaGUNE, Basque Research and Technology Alliance (BRTA), San Sebastián, 20014, Spain
- CIBER-BBN, ISCIII, San Sebastián, 20014, Spain
| | - Christoph Hanske
- CIC biomaGUNE, Basque Research and Technology Alliance (BRTA), San Sebastián, 20014, Spain
| | - Jost Adam
- University of Southern Denmark, SDU Centre for Photonics Engineering, Mads Clausen Institute, Odense, 5230, Denmark
| | - Andreas Seifert
- CIC nanoGUNE BRTA, San Sebastián, 20018, Spain
- IKERBASQUE - Basque Foundation for Science, Bilbao, 48009, Spain
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16
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Scarabelli L, Sun M, Zhuo X, Yoo S, Millstone JE, Jones MR, Liz-Marzán LM. Plate-Like Colloidal Metal Nanoparticles. Chem Rev 2023; 123:3493-3542. [PMID: 36948214 PMCID: PMC10103137 DOI: 10.1021/acs.chemrev.3c00033] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/24/2023]
Abstract
The pseudo-two-dimensional (2D) morphology of plate-like metal nanoparticles makes them one of the most anisotropic, mechanistically understood, and tunable structures available. Although well-known for their superior plasmonic properties, recent progress in the 2D growth of various other materials has led to an increasingly diverse family of plate-like metal nanoparticles, giving rise to numerous appealing properties and applications. In this review, we summarize recent progress on the solution-phase growth of colloidal plate-like metal nanoparticles, including plasmonic and other metals, with an emphasis on mechanistic insights for different synthetic strategies, the crystallographic habits of different metals, and the use of nanoplates as scaffolds for the synthesis of other derivative structures. We additionally highlight representative self-assembly techniques and provide a brief overview on the attractive properties and unique versatility benefiting from the 2D morphology. Finally, we share our opinions on the existing challenges and future perspectives for plate-like metal nanomaterials.
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Affiliation(s)
- Leonardo Scarabelli
- NANOPTO Group, Institue of Materials Science of Barcelona, Bellaterra, 08193, Spain
| | - Muhua Sun
- National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
| | - Xiaolu Zhuo
- Guangdong Provincial Key Lab of Optoelectronic Materials and Chips, School of Science and Engineering, The Chinese University of Hong Kong (Shenzhen), Shenzhen 518172, China
| | - Sungjae Yoo
- Research Institute for Nano Bio Convergence, Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Chemistry Sungkyunkwan University, Suwon 16419, Republic of Korea
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Jill E Millstone
- Department of Chemistry, Department of Chemical and Petroleum Engineering, Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Matthew R Jones
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
- Department of Materials Science & Nanoengineering, Rice University, Houston, Texas 77005, United States
| | - Luis M Liz-Marzán
- CIC biomaGUNE, Basque Research and Technology Alliance (BRTA), 20014 Donostia-San Sebastián, Spain
- Ikerbasque, 43009 Bilbao, Spain
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 20014 Donostia-San Sebastián, Spain
- Cinbio, Universidade de Vigo, 36310 Vigo, Spain
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17
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Wang J, Fang W, Liu H. Gold Triangular Nanoprisms: Anisotropic Plasmonic Materials with Unique Structures and Properties. Chempluschem 2023; 88:e202200464. [PMID: 36781389 DOI: 10.1002/cplu.202200464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2022] [Revised: 02/11/2023] [Accepted: 02/13/2023] [Indexed: 02/15/2023]
Abstract
As a novel type of anisotropic inorganic nanomaterials, gold triangular nanoprisms (AuTNPs) have been widely studied for their well-defined structures and excellent plasmonic properties. This review starts with synthetic methodology, combing through the early thermal solution method to the mature seed-mediated method and seedless method. The possible mechanisms proposed by predecessors and the problems needed to be solved are also arranged. Along with this, the important morphological evolution process of AuTNPs during synthesis and post-synthesis stages are revealed, which is of great significance for further understanding the structure of AuTNPs and developing new synthesis strategies. Finally, the applications of AuTNPs, especially associated with plasmonic properties, are listed and summarized where surface-enhanced Raman scattering (SERS), catalysis, phototherapy and biosensor are included, so that researchers can quickly comprehend the current situation, and provide a basis for further development and exploration of AuTNPs.
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Affiliation(s)
- Jiangming Wang
- School of Chemical Science and Engineering Shanghai Research Institute for Intelligent Autonomous Systems Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai, 200092, P. R. China
| | - Weina Fang
- Shanghai Key Laboratory of Green Chemistry and Chemical Processes School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200241, P. R. China
| | - Huajie Liu
- School of Chemical Science and Engineering Shanghai Research Institute for Intelligent Autonomous Systems Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai, 200092, P. R. China
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18
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Chan Park S, Ki Son H, Sharma G, Kim JC. Preparation of gold nanoparticles using monoolein cubic phase as a template. J IND ENG CHEM 2023. [DOI: 10.1016/j.jiec.2023.01.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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19
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Qu SZ, Zhao YX, Kang HS, Zou JW, Ma L, Ding SJ, Chen XB. Plasmon Coupling and Efficient Charge Transfer in Rough-Surfaced Au Nanotriangles/MXene Hybrids as an Ultrasensitive Surface-Enhanced Raman Scattering Platform. ACS OMEGA 2022; 7:48438-48446. [PMID: 36591166 PMCID: PMC9798532 DOI: 10.1021/acsomega.2c06704] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Accepted: 12/01/2022] [Indexed: 06/17/2023]
Abstract
The rational design of Raman substrate materials with prominent electromagnetic enhancement and charge transfer is quite important for surface-enhanced Raman scattering (SERS). Herein, an efficient SERS substrate based on two-dimensional ultrathin Ti3C2T x MXene and rough-surfaced Au nanotriangles (NTs) was successfully prepared for efficient detection of organic molecules due to the synthetic effect of an optimized electromagnetic field and charge transfer. Uniform Au NTs with tunable surface roughness were controllably prepared by selectively depositing of Au on the smooth Au NTs. Due to the large surface area, tunable plasmon resonance, and abundant hotspots on the planar surface, the modified Au NTs showed much better SERS performance than initial Au NTs. By combination of the rough-surfaced Au NTs with MXene, the Ti3C2T x /Au NT hybrids exhibited much better SERS performance than initial Au NTs and Au NTs with a rough surface. The detection limit is down to 10-12 M, and the analytical enhancement factors reach 3.6 × 109 (at 1174 cm-1) on detecting crystal violet excited at 785 nm. This is because the strong plasmon coupling between the in-plane resonance of Au NTs and transversal plasmon resonance of Ti3C2T x MXene around 785 nm can generate an intense interfacial electromagnetic field for amplifying SERS signals. Additionally, the efficient charge transfer between Au NTs, MXene, and molecules also plays an important role in enhancing the SERS performance. This work presents a new insight to develop high-performance SERS substrates based on plasmon.
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Affiliation(s)
- Shu-Zhou Qu
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Yi-Xin Zhao
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Hao-Sen Kang
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Jing-Wen Zou
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Liang Ma
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
| | - Si-Jing Ding
- School
of Mathematics and Physics, China University
of Geosciences (Wuhan), Wuhan 430074, P. R. China
| | - Xiang-Bai Chen
- Hubei
Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China
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20
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Yu X, Wang Z, Cui H, Wu X, Chai W, Wei J, Chen Y, Zhang Z. A Review on Gold Nanotriangles: Synthesis, Self-Assembly and Their Applications. Molecules 2022; 27:8766. [PMID: 36557899 PMCID: PMC9783914 DOI: 10.3390/molecules27248766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/03/2022] [Accepted: 12/08/2022] [Indexed: 12/14/2022] Open
Abstract
Gold nanoparticles (AuNPs) with interesting optical properties have attracted much attention in recent years. The synthesis and plasmonic properties of AuNPs with a controllable size and shape have been extensively investigated. Among these AuNPs, gold nanotriangles (AuNTs) exhibited unique optical and plasmonic properties due to their special triangular anisotropy. Indeed, AuNTs showed promising applications in optoelectronics, optical sensing, imaging and other fields. However, only few reviews about these applications have been reported. Herein, we comprehensively reviewed the synthesis and self-assembly of AuNTs and their applications in recent years. The preparation protocols of AuNTs are mainly categorized into chemical synthesis, biosynthesis and physical-stimulus-induced synthesis. The comparison between the advantages and disadvantages of various synthetic strategies are discussed. Furthermore, the specific surface modification of AuNTs and their self-assembly into different dimensional nano- or microstructures by various interparticle interactions are introduced. Based on the unique physical properties of AuNTs and their assemblies, the applications towards chemical biology and sensing were developed. Finally, the future development of AuNTs is prospected.
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Affiliation(s)
| | | | | | | | | | - Jinjian Wei
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Yuqin Chen
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
| | - Zhide Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Shandong Normal University, Jinan 250014, China
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21
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Saha P, Akter R, Shah SS, Mahfoz W, Aziz MA, Ahammad AJS. Gold Nanomaterials and their Composites as Electrochemical Sensing Platforms for Nitrite Detection. Chem Asian J 2022; 17:e202200823. [PMID: 36039466 DOI: 10.1002/asia.202200823] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 08/29/2022] [Indexed: 02/01/2023]
Abstract
Nitrite is one of the abundant toxic components existing in the environment and is likely to have a great potential to affect human health badly. For that reason, it has become crucial to build a reliable nitrite detection method. In recent years, several nitrite monitoring systems have been proposed. Compared with traditional analytical strategies, the electrochemical approach has a bunch of advantages, including low cost, rapid response, easy operation, simplicity, etc. In this case, noble metal nanomaterials, especially Au-based nanomaterials, have attracted attention in electrode modification because of higher catalytic activity, facile mass transfer, and broad active area for determining nitrite. This review is based on the state-of-the-art, which includes a variety of nanomaterials that have been coupled with AuNPs for the creation of nanocomposites, and the construction as well as development of electrochemical sensors for nitrite detection over the last few years (2016-2022). A background study on synthesizing different morphological AuNPs and nanocomposites has also been introduced. The fabrication methods and sensing capabilities of modified electrodes are given special consideration.
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Affiliation(s)
- Protity Saha
- Jagannath University, Chemistry, Department of Chemistry, 1100, BANGLADESH
| | - Riva Akter
- Jagannath University, Chemistry, Department of Chemistry, 1100, BANGLADESH
| | - Syed Shaheen Shah
- King Fahd University of Petroleum & Minerals, Physics Department, Building 6, 31261, Dhahran, SAUDI ARABIA
| | - Wael Mahfoz
- King Fahd University of Petroleum & Minerals, Chemistry, Chemistry Department, 31261, Dhahran, SAUDI ARABIA
| | - Md Abdul Aziz
- King Fahd University of Petroleum & Minerals, Center of Research excellence in Nanotechnology, KFUPM Box # 81, 31261, Dhahran, SAUDI ARABIA
| | - A J Saleh Ahammad
- Jagannath University, Chemistry, Department of Chemistry, 1100, BANGLADESH
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22
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Wang BX, Duan G, Xu W, Xu C, Jiang J, Yang Z, Wu Y, Pi F. Flexible surface-enhanced Raman scatting substrates: recent advances in their principles, design strategies, diversified material selections and applications. Crit Rev Food Sci Nutr 2022; 64:472-516. [PMID: 35930338 DOI: 10.1080/10408398.2022.2106547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Surface-enhanced Raman scattering (SERS) is widely used as a powerful analytical technology in cutting-edge areas such as food safety, biology, chemistry, and medical diagnosis, providing ultra-fast, ultra-sensitive, nondestructive characterization and achieving ultra-high detection sensitivity even down to the single-molecule level. Development of Raman spectroscopy is strongly dependent on high-performance SERS substrates, which have long evolved from the early days of rough metal electrodes to periodic nanopatterned arrays building on solid supporting substrates. For rigid SERS substrates, however, their applications are restricted by sophisticated pretreatments for detecting solid samples with non-planar surfaces. It is therefore essential to reassert the principles in constructing flexible SERS substrates. Herein, we comprehensively review the state-of-the-art in understanding, preparing and using flexible SERS. The basic mechanisms behind the flexible SERS are briefly outlined, typical design strategies are highlighted and diversified selection of materials in preparing flexible SERS substrates are reviewed. Then the recent achievements of various interdisciplinary applications based on flexible SERS substrates are summarized. Finally, the challenges and perspectives for future evolution of flexible SERS and their applications are demonstrated. We propose new research directions focused on stimulating the real potential of SERS as an advanced analytical technique for commercialization.
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Affiliation(s)
- Ben-Xin Wang
- School of Science, Jiangnan University, Wuxi, China
| | - Guiyuan Duan
- School of Science, Jiangnan University, Wuxi, China
| | - Wei Xu
- School of Science, Jiangnan University, Wuxi, China
| | - Chongyang Xu
- School of Science, Jiangnan University, Wuxi, China
| | | | | | - Yangkuan Wu
- School of Science, Jiangnan University, Wuxi, China
| | - Fuwei Pi
- State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, China
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23
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Spirin MG, Brichkin SB, Lizunova AA, Razumov VF. Synthesis of Gold Nanorods in a Binary Mixture of Cationic Surfactants. COLLOID JOURNAL 2022. [DOI: 10.1134/s1061933x22010136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Li L, Liu J, Li X, Tang Y, Shi C, Zhang X, Cui Y, Wang L, Xu W. Influencing factors and characterization methods of nanoparticles regulating amyloid aggregation. SOFT MATTER 2022; 18:3278-3290. [PMID: 35437550 DOI: 10.1039/d1sm01704g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Human disorders associated with amyloid aggregation, such as Alzheimer's disease and Parkinson's disease, afflict the lives of millions worldwide. When peptides and proteins in the body are converted to amyloids, which have a tendency to aggregate, the toxic oligomers produced during the aggregation process can trigger a range of diseases. Nanoparticles (NPs) have been found to possess surface effects that can modulate the amyloid aggregation process and they have potential application value in the treatment of diseases related to amyloid aggregation and fibrillary tangles. In this review, we discuss recent progress relating to studies of nanoparticles that regulate amyloid aggregation. The review focuses on the factors influencing this regulation, which are important as guidelines for the future design of NPs for the treatment of amyloid aggregation. We describe the characterization methods that have been utilized so far in such studies. This review provides research information and characterization methods for the rational design of NPs, which should result in therapeutic strategies for amyloid diseases.
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Affiliation(s)
- Lingyi Li
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
| | - Jianhui Liu
- Yantai Center of Ecology and Environment Monitoring of Shandong Province, Yantai 264025, China
| | - Xinyue Li
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
| | - Yuanhan Tang
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
| | - Changxin Shi
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
| | - Xin Zhang
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
| | - Yuming Cui
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
| | - Linlin Wang
- State Key Laboratory of Long-Acting and Targeting Drug Delivery System, Shandong Luye Pharmaceutical Co., Ltd, Yantai 264000, China.
| | - Wenlong Xu
- School of Chemistry and Materials Science, Ludong University, Yantai 264025, China.
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Breuch R, Klein D, Moers C, Siefke E, Wickleder C, Kaul P. Development of Gold Nanoparticle-Based SERS Substrates on TiO2-Coating to Reduce the Coffee Ring Effect. NANOMATERIALS 2022; 12:nano12050860. [PMID: 35269348 PMCID: PMC8912524 DOI: 10.3390/nano12050860] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 02/27/2022] [Accepted: 03/01/2022] [Indexed: 02/05/2023]
Abstract
Hydrophilic surface-enhanced Raman spectroscopy (SERS) substrates were prepared by a combination of TiO2-coatings of aluminium plates through a direct titanium tetraisopropoxide (TTIP) coating and drop coated by synthesised gold nanoparticles (AuNPs). Differences between the wettability of the untreated substrates, the slowly dried Ti(OH)4 substrates and calcinated as well as plasma treated TiO2 substrates were analysed by water contact angle (WCA) measurements. The hydrophilic behaviour of the developed substrates helped to improve the distribution of the AuNPs, which reflects in overall higher lateral SERS enhancement. Surface enhancement of the substrates was tested with target molecule rhodamine 6G (R6G) and a fibre-coupled 638 nm Raman spectrometer. Additionally, the morphology of the substrates was characterised using scanning electron microscopy (SEM) and Raman microscopy. The studies showed a reduced influence of the coffee ring effect on the particle distribution, resulting in a more broadly distributed edge region, which increased the spatial reproducibility of the measured SERS signal in the surface-enhanced Raman mapping measurements on mm scale.
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Affiliation(s)
- René Breuch
- Institute of Safety and Security Research, University of Applied Sciences Bonn-Rhein-Sieg, von-Liebig-Str. 20, 53359 Rheinbach, Germany; (D.K.); (C.M.); (E.S.)
- Correspondence: (R.B.); (P.K.)
| | - Daniel Klein
- Institute of Safety and Security Research, University of Applied Sciences Bonn-Rhein-Sieg, von-Liebig-Str. 20, 53359 Rheinbach, Germany; (D.K.); (C.M.); (E.S.)
| | - Cassandra Moers
- Institute of Safety and Security Research, University of Applied Sciences Bonn-Rhein-Sieg, von-Liebig-Str. 20, 53359 Rheinbach, Germany; (D.K.); (C.M.); (E.S.)
| | - Eleni Siefke
- Institute of Safety and Security Research, University of Applied Sciences Bonn-Rhein-Sieg, von-Liebig-Str. 20, 53359 Rheinbach, Germany; (D.K.); (C.M.); (E.S.)
| | - Claudia Wickleder
- Inorganic Chemistry, Department Chemie and Biologie, Cµ—Center for Micro- and Nanochemistry and (Bio)Technology, Faculty of Science and Technology, University of Siegen, Adolf-Reichwein-Str., 57068 Siegen, Germany;
| | - Peter Kaul
- Institute of Safety and Security Research, University of Applied Sciences Bonn-Rhein-Sieg, von-Liebig-Str. 20, 53359 Rheinbach, Germany; (D.K.); (C.M.); (E.S.)
- Correspondence: (R.B.); (P.K.)
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Tim B, Błaszkiewicz P, Kotkowiak M. Recent Advances in Metallic Nanoparticle Assemblies for Surface-Enhanced Spectroscopy. Int J Mol Sci 2021; 23:291. [PMID: 35008714 PMCID: PMC8745207 DOI: 10.3390/ijms23010291] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 11/29/2021] [Accepted: 12/01/2021] [Indexed: 12/13/2022] Open
Abstract
Robust and versatile strategies for the development of functional nanostructured materials often focus on assemblies of metallic nanoparticles. Research interest in such assemblies arises due to their potential applications in the fields of photonics and sensing. Metallic nanoparticles have received considerable recent attention due to their connection to the widely studied phenomenon of localized surface plasmon resonance. For instance, plasmonic hot spots can be observed within their assemblies. A useful form of spectroscopy is based on surface-enhanced Raman scattering (SERS). This phenomenon is a commonly used in sensing techniques, and it works using the principle that scattered inelastic light can be greatly enhanced at a surface. However, further research is required to enable improvements to the SERS techniques. For example, one question that remains open is how to design uniform, highly reproducible, and efficiently enhancing substrates of metallic nanoparticles with high structural precision. In this review, a general overview on nanoparticle functionalization and the impact on nanoparticle assembly is provided, alongside an examination of their applications in surface-enhanced Raman spectroscopy.
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Affiliation(s)
| | | | - Michał Kotkowiak
- Faculty of Materials Engineering and Technical Physics, Poznan University of Technology, Piotrowo 3, 60-965 Poznan, Poland; (B.T.); (P.B.)
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Zhao S, Yu Y, Zhang B, Feng P, Dang C, Li M, Zhao L, Gao L. Dual-Mode Circularly Polarized Light Emission and Metal-Enhanced Fluorescence Realized by the Luminophore-Chiral Cellulose Nanocrystal Interfaces. ACS APPLIED MATERIALS & INTERFACES 2021; 13:59132-59141. [PMID: 34852461 DOI: 10.1021/acsami.1c19404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Circularly polarized (CP) light has attracted wide attention for its great potential in broad applications. However, it remains a challenge to generate left-handed and right-handed circularly polarized (LCP and RCP) light from cellulose nanocrystal (CNC)-based materials only with an intrinsic left-handed chiral structure, owing to the pattern of CP light emission primarily based on the chirality of materials. Herein, a separation structure of luminophore layers and chiral CNCs was provided to achieve dual-mode CP light emission by building a luminophore-chiral CNC interface. By directly exciting the back and front of two-layer films, LCP and RCP light could be easily emitted without any assisting means and specific setting angles. In addition, owing to the formation of the luminophore-chiral CNC interface, metal-enhanced fluorescence (MEF) was achieved to offset the brightness loss caused by circular polarization. By incorporating gold triangular nanoprisms in CNC chiral layers, the fluorescence enhancement of the ensemble was as high as 6.5-fold. The decisive role of the luminophore-chiral CNC interface in enhancing luminescence and dual-mode CP light emission was carefully investigated by contrasting the systems with and without luminophore-chiral CNC interfaces in this study. We believe that this dual-mode CP light emission film with MEF enables a promising approach to extending the application of CP light materials.
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Affiliation(s)
- Sixiang Zhao
- State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Yingying Yu
- State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Boyu Zhang
- State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Pu Feng
- State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Congcong Dang
- State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Ming Li
- State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Liancheng Zhao
- State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Liming Gao
- State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
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Hossain MK, Drmosh QA. Clusters-based silver nanorings: An active substrate for surface-enhanced Raman scattering. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 263:120141. [PMID: 34280795 DOI: 10.1016/j.saa.2021.120141] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 06/28/2021] [Accepted: 06/30/2021] [Indexed: 06/13/2023]
Abstract
Plasmonic nanostructures, particularly irregular surfaces of ring-like silver (Ag) nanostructures are promising candidates in surface-enhanced Raman scattering (SERS) spectroscopy. In this work, clusters-based Ag nanorings have been fabricated and characterized as SERS-active substrates. The rim of the as-fabricated Ag nanorings was found neither discontinuous nor linear aggregation of nanoparticles. High-resolution field emission scanning electron microscopy (FESEM) revealed that the individual constituent clusters were different from each other, particularly in terms of size and shape in addition to the cases how such clusters were emerged as the edge of the nanoring. Considering the dimensions of the clusters and the arrangement of such clusters as nanorings, it was speculated that the local electromagnetic (EM) near-field distributions would excel and thus enhanced SERS signals would be achieved. Indeed, the inherent features of the nanorings facilitated to achieve SERS enhancement factors as high as 2.1 × 104. SERS-activity of as-fabricated Ag nanorings was confirmed using Rhodamine 6G (R6G) as Raman-active dyes and the enhancement was compared to those obtained from R6G adsorbed on Ag-ZnO/Glass and ZnO/Glass. To the best of our knowledge, this is the first attempt to explore the impact of localized EM near-field within the segments of nanorings through SERS spectroscopy. A model was designed resembling the nanorings under this investigation to simulate EM near-field distributions by finite difference time domain (FDTD) analysis. The dimensions of the model geometry were chosen according to the observations achieved by FESEM. To simplify the simulations, nanoobjects were considered spherical and organized in a periodic fashion, although the constituent clusters of Ag nanorings were found irregular in shape and arrangement. Since EM near-field distribution highly depends on interparticle gaps, three scenarios were implemented, such as, small gap in between two adjacent nanoobjects and adjacent nanoobjects in touch and overlapped. Each configuration was simulated and EM near-field distribution was extracted for s-, p- and 450 of incident polarizations followed by a plausible correlation to SERS enhancements. Such correlated investigations as well as clusters-based Ag nanorings not only inspire the ones to look for cost-effective SERS-active substrate, but also understand the underlying EM mechanism in SERS enhancements.
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Affiliation(s)
- Mohammad Kamal Hossain
- Interdisciplinary Research Center for Renewable Energy and Power System (IRC-REPS), Research Institute, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia.
| | - Qasem Ahmed Drmosh
- Interdisciplinary Research Center for Hydrogen and Energy Storage (IRC-HES), Research Institute, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia
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Zhang D, Liang P, Chen W, Tang Z, Li C, Xiao K, Jin S, Ni D, Yu Z. Rapid field trace detection of pesticide residue in food based on surface-enhanced Raman spectroscopy. Mikrochim Acta 2021; 188:370. [PMID: 34622367 DOI: 10.1007/s00604-021-05025-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 09/19/2021] [Indexed: 12/17/2022]
Abstract
Surface-enhanced Raman spectroscopy is an alternative detection tool for monitoring food security. However, there is still a lack of a conclusion of SERS detection with respect to pesticides and real sample analysis, and the summary of intelligent algorithms in SERS is also a blank. In this review, a comprehensive report of pesticides detection using SERS technology is given. The SERS detection characteristics of different types of pesticides and the influence of substrate on inspection are discussed and compared by the typical ways of classification. The key points, including the progress in real sample analysis and Raman data processing methods with intelligent algorithm, are highlighted. Lastly, major challenges and future research trends of SERS analysis of pesticide residue are also addressed. SERS has been proven to be a powerful technique for rapid test of residue pesticides in complex food matrices, but there still is a tremendous development space for future research.
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Affiliation(s)
- De Zhang
- College of Horticulture & Forestry Sciences, Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
- College of Optical and Electronic Technology, China Jiliang University, Hangzhou, 310018, China
| | - Pei Liang
- College of Optical and Electronic Technology, China Jiliang University, Hangzhou, 310018, China.
| | - Wenwen Chen
- College of Horticulture & Forestry Sciences, Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zhexiang Tang
- College of Optical and Electronic Technology, China Jiliang University, Hangzhou, 310018, China
| | - Chen Li
- Jiangxi Sericulture and Tea Research Institute, Nanchang, 330203, China
| | - Kunyue Xiao
- College of Horticulture & Forestry Sciences, Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Shangzhong Jin
- College of Optical and Electronic Technology, China Jiliang University, Hangzhou, 310018, China
| | - Dejiang Ni
- College of Horticulture & Forestry Sciences, Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China
| | - Zhi Yu
- College of Horticulture & Forestry Sciences, Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China.
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Yang H, Gun X, Pang G, Zheng Z, Li C, Yang C, Wang M, Xu K. Femtosecond laser patterned superhydrophobic/hydrophobic SERS sensors for rapid positioning ultratrace detection. OPTICS EXPRESS 2021; 29:16904-16913. [PMID: 34154243 DOI: 10.1364/oe.423789] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Accepted: 05/10/2021] [Indexed: 06/13/2023]
Abstract
Ultratrace molecular detections are vital for precancer diagnosis, forensic analysis, and food safety. Superhydrophobic (SH) surface-enhanced Raman scattering (SERS) sensors are regarded as an ideal approach to improve detection performance by concentrating analyte molecules within a small volume. However, due to the low adhesion of SH surfaces, the analyte droplet is prone to rolling, making it hard to deposit molecules on a predetermined position. Furthermore, the sediment with a very small area on the SH-SERS surface is difficult to be captured even with a Raman microscope. In this study, femtosecond laser fabricated hybrid SH/hydrophobic (SH/HB) surfaces are successfully applied to realize a rapid and highly sensitive SERS detection. By modulating dual surface structures and wetting behaviors, the analyte molecules can be enriched at the edge of HB pattern. This improves the convenience and speed of Raman test. On a hybrid SH/HB SERS substrate with a circular HB pattern at 300-µm-diameter, a femtomolar level (10-14 M) of rhodamine 6G can be detected by using analyte volumes of just 5 µL. The SERS enhancement factor can reach 5.7×108 and a good uniformity with a relative standard deviation of 6.98% is achieved. Our results indicate that the laser fabrication of hybrid SERS sensor offers an efficient and cost-effective approach for ultratrace molecular detection.
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Sang Y, Chen X, Zhang L, Li D, Xu H. Electrospun polymeric nanofiber decorated with sea urchin-like gold nanoparticles as an efficient and stable SERS platform. J Colloid Interface Sci 2021; 590:125-133. [PMID: 33524713 DOI: 10.1016/j.jcis.2021.01.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 01/11/2021] [Accepted: 01/12/2021] [Indexed: 11/24/2022]
Abstract
Surface enhanced Raman scattering (SERS)-based nanoprobes have been used as well-established analytical tools enabling single-molecule detection. In this work, we report a facile method to decorate sea urchin-like gold nanoparticles (SUGNPs) on the surface of PMMA/P4VP nanofibers. Firstly, PMMA/P4VP nanofibers within the submicrometer size range were prepared by applying the electrospinning technique. Then, the incorporation of SUGNPs on the surface of PMMA/P4VP nanofiber was achieved by immersing PMMA/P4VP nanofiber into freshly prepared SUGNP aqueous solution through the specific Au-N interactions. The as-fabricated SUGNP-coated PMMA/P4VP nanofibers exhibited good sensitivity and reproducibility in SERS measurements with the relative standard deviation down to 6.6%, by employing 4-mercaptobenzoic acid as a probe molecule with 30 min of soaking time. Hence, we envisage that the SUGNP-coated PMMA/P4VP nanofibers can act as efficient and stable SERS substrates for potential applications in molecular detection as well as chemical and biological analysis.
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Affiliation(s)
- Yaqin Sang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
| | - Xin Chen
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
| | - Li Zhang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
| | - Dongyan Li
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China
| | - Hui Xu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing 211816, China.
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Sousa de Almeida M, Susnik E, Drasler B, Taladriz-Blanco P, Petri-Fink A, Rothen-Rutishauser B. Understanding nanoparticle endocytosis to improve targeting strategies in nanomedicine. Chem Soc Rev 2021; 50:5397-5434. [PMID: 33666625 PMCID: PMC8111542 DOI: 10.1039/d0cs01127d] [Citation(s) in RCA: 342] [Impact Index Per Article: 114.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Indexed: 12/19/2022]
Abstract
Nanoparticles (NPs) have attracted considerable attention in various fields, such as cosmetics, the food industry, material design, and nanomedicine. In particular, the fast-moving field of nanomedicine takes advantage of features of NPs for the detection and treatment of different types of cancer, fibrosis, inflammation, arthritis as well as neurodegenerative and gastrointestinal diseases. To this end, a detailed understanding of the NP uptake mechanisms by cells and intracellular localization is essential for safe and efficient therapeutic applications. In the first part of this review, we describe the several endocytic pathways involved in the internalization of NPs and we discuss the impact of the physicochemical properties of NPs on this process. In addition, the potential challenges of using various inhibitors, endocytic markers and genetic approaches to study endocytosis are addressed along with the principal (semi) quantification methods of NP uptake. The second part focuses on synthetic and bio-inspired substances, which can stimulate or decrease the cellular uptake of NPs. This approach could be interesting in nanomedicine where a high accumulation of drugs in the target cells is desirable and clearance by immune cells is to be avoided. This review contributes to an improved understanding of NP endocytic pathways and reveals potential substances, which can be used in nanomedicine to improve NP delivery.
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Affiliation(s)
- Mauro Sousa de Almeida
- Adolphe Merkle Institute, University of FribourgChemin des Verdiers 41700 FribourgSwitzerland
| | - Eva Susnik
- Adolphe Merkle Institute, University of FribourgChemin des Verdiers 41700 FribourgSwitzerland
| | - Barbara Drasler
- Adolphe Merkle Institute, University of FribourgChemin des Verdiers 41700 FribourgSwitzerland
| | | | - Alke Petri-Fink
- Adolphe Merkle Institute, University of FribourgChemin des Verdiers 41700 FribourgSwitzerland
- Department of Chemistry, University of FribourgChemin du Musée 91700 FribourgSwitzerland
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Spectroscopically clean Au nanoparticles for catalytic decomposition of hydrogen peroxide. Sci Rep 2021; 11:9709. [PMID: 33958687 PMCID: PMC8102470 DOI: 10.1038/s41598-021-89235-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 04/16/2021] [Indexed: 11/25/2022] Open
Abstract
Au nanoparticles synthesized from colloidal techniques have the capability in many applications such as catalysis and sensing. Au nanoparticles function as both catalyst and highly sensitive SERS probe can be employed for sustainable and green catalytic process. However, capping ligands that are necessary to stabilize nanoparticles during synthesis are negative for catalytic activity. In this work, a simple effective mild thermal treatment to remove capping ligands meanwhile preserving the high SERS sensitivity of Au nanoparticles is reported. We show that under the optimal treatment conditions (250 °C for 2 h), 50 nm Au nanoparticles surfaces are free from any capping molecules. The catalytic activity of treated Au nanoparticles is studied through H2O2 decomposition, which proves that the treatment is favorable for catalytic performance improvement. A reaction intermediate during H2O2 decomposition is observed and identified.
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Time Optimization of Seed-Mediated Gold Nanotriangle Synthesis Based on Kinetic Studies. NANOMATERIALS 2021; 11:nano11041049. [PMID: 33923968 PMCID: PMC8073722 DOI: 10.3390/nano11041049] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 04/14/2021] [Accepted: 04/16/2021] [Indexed: 12/19/2022]
Abstract
The synthesis of shape-anisotropic plasmonic nanoparticles such as gold nanotriangles is of increasing interest. These particles have a high potential for applications due to their notable optical properties. A key challenge of the synthesis is usually the low reproducibility. Even the optimized seed-based methods often lack in the synthesis yield or are labor- and time-consuming. In this work, a seed-mediated synthesis with high reproducibility is replicated in order to determine the necessary reaction time for each step. Online monitoring of the reaction mixtures by UV–VIS spectroscopy is used as a powerful tool to track the evolution of the synthesis. The kinetics of the individual stages is elucidated by real-time investigations. As a consequence, the complete synthesis could be optimized and can now be realized in a single day instead of three without any loss in the resulting sample quality.
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Abstract
The field of single nanoparticle plasmonics has grown enormously. There is no doubt that a wide diversity of the nanoplasmonic techniques and nanostructures represents a tremendous opportunity for fundamental biomedical studies as well as sensing and imaging applications. Single nanoparticle plasmonic biosensors are efficient in label-free single-molecule detection, as well as in monitoring real-time binding events of even several biomolecules. In the present review, we have discussed the prominent advantages and advances in single particle characterization and synthesis as well as new insight into and information on biomedical diagnosis uniquely obtained using single particle approaches. The approaches include the fundamental studies of nanoplasmonic behavior, two typical methods based on refractive index change and characteristic light intensity change, exciting innovations of synthetic strategies for new plasmonic nanostructures, and practical applications using single particle sensing, imaging, and tracking. The basic sphere and rod nanostructures are the focus of extensive investigations in biomedicine, while they can be programmed into algorithmic assemblies for novel plasmonic diagnosis. Design of single nanoparticles for the detection of single biomolecules will have far-reaching consequences in biomedical diagnosis.
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Affiliation(s)
- Xingyi Ma
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea.
| | - Sang Jun Sim
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea.
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Soto-Cruz J, Conejo-Valverde P, Sáenz-Arce G, Dou H, Rojas-Carrillo O. Biofabrication of Gold Nanotriangles Using Liposomes as a Dual Functional Reductant and Stabilizer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:3446-3455. [PMID: 33683907 DOI: 10.1021/acs.langmuir.1c00104] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Negatively charged liposomes accomplished both functions as a reducing and stabilizing agent in the synthesis of gold nanotriangles (GNTs). Liposomes are based on a mixture of phospholipids phosphatidylcholine/phosphoglycerol, and they were used as a template phase to perform the GNTs. The method was evaluated under different conditions such as temperature, reaction time, phosphoglycerol chain length, and precursor concentration. Isotropic and anisotropic gold nanoparticles are formed simultaneously during the synthesis. Therefore, by combining centrifugation and depletion flocculation strategies, the sample was concentrated in terms of GNTs from 15% crude to 80% by using sodium dodecyl sulfate (SDS). As a result, a green colored dispersion was obtained containing highly purified, well-defined, negatively charged GNTs, where the edge length of most particles is centered in the range of 60-80 nm with an average thickness of 7.8 ± 0.1 nm. By this purification process, it was possible to highly increase the yield in terms of GNTs. Other surfactants [cetyltrimethylammonium chloride (CTAC), hexadecyltrimethylammonium bromide (CTAB), Tween 20, and dodecyldimethylammonium bromide] were evaluated during the purification stage, and both CTAB and CTAC show similar results to those obtained by using SDS. These GNTs are potential candidates for future applications in molecular imaging, photothermal therapy, drug delivery, biosensing, and photodynamic therapy.
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Affiliation(s)
- Jackeline Soto-Cruz
- Laboratorio de polímeros (POLIUNA), School of Chemistry, Universidad Nacional, Heredia 86-3000, Costa Rica
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Paolo Conejo-Valverde
- Laboratorio de polímeros (POLIUNA), School of Chemistry, Universidad Nacional, Heredia 86-3000, Costa Rica
| | | | - Hongjing Dou
- State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
| | - Oscar Rojas-Carrillo
- Laboratorio de polímeros (POLIUNA), School of Chemistry, Universidad Nacional, Heredia 86-3000, Costa Rica
- National Center for Biotechnological Innovations (CENIBiot), CeNAT-CONARE, San José 1174-1200, Costa Rica
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S. S. dos Santos P, M. M. M. de Almeida J, Pastoriza-Santos I, C. C. Coelho L. Advances in Plasmonic Sensing at the NIR-A Review. SENSORS (BASEL, SWITZERLAND) 2021; 21:2111. [PMID: 33802958 PMCID: PMC8002678 DOI: 10.3390/s21062111] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 03/04/2021] [Accepted: 03/12/2021] [Indexed: 11/21/2022]
Abstract
Surface plasmon resonance (SPR) and localized surface plasmon resonance (LSPR) are among the most common and powerful label-free refractive index-based biosensing techniques available nowadays. Focusing on LSPR sensors, their performance is highly dependent on the size, shape, and nature of the nanomaterial employed. Indeed, the tailoring of those parameters allows the development of LSPR sensors with a tunable wavelength range between the ultra-violet (UV) and near infra-red (NIR). Furthermore, dealing with LSPR along optical fiber technology, with their low attenuation coefficients at NIR, allow for the possibility to create ultra-sensitive and long-range sensing networks to be deployed in a variety of both biological and chemical sensors. This work provides a detailed review of the key science underpinning such systems as well as recent progress in the development of several LSPR-based biosensors in the NIR wavelengths, including an overview of the LSPR phenomena along recent developments in the field of nanomaterials and nanostructure development towards NIR sensing. The review ends with a consideration of key advances in terms of nanostructure characteristics for LSPR sensing and prospects for future research and advances in this field.
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Affiliation(s)
- Paulo S. S. dos Santos
- INESC TEC—Institute for Systems and Computer Engineering, Technology and Science, and Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal;
- Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - José M. M. M. de Almeida
- Department of Physics, School of Science and Technology, University of Trás-os-Montes e Alto Douro, 5001-801 Vila Real, Portugal;
| | - Isabel Pastoriza-Santos
- CINBIO, Universidade de Vigo, Campus Universitario Lagoas, Marcosende, 36310 Vigo, Spain;
- SERGAS-UVIGO, Galicia Sur Health Research Institute (IIS Galicia Sur), 36312 Vigo, Spain
| | - Luís C. C. Coelho
- INESC TEC—Institute for Systems and Computer Engineering, Technology and Science, and Faculty of Sciences, University of Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal;
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Oyarzún MP, Tapia-Arellano A, Cabrera P, Jara-Guajardo P, Kogan MJ. Plasmonic Nanoparticles as Optical Sensing Probes for the Detection of Alzheimer's Disease. SENSORS (BASEL, SWITZERLAND) 2021; 21:2067. [PMID: 33809416 PMCID: PMC7998661 DOI: 10.3390/s21062067] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 03/10/2021] [Accepted: 03/11/2021] [Indexed: 12/13/2022]
Abstract
Alzheimer's disease (AD), considered a common type of dementia, is mainly characterized by a progressive loss of memory and cognitive functions. Although its cause is multifactorial, it has been associated with the accumulation of toxic aggregates of the amyloid-β peptide (Aβ) and neurofibrillary tangles (NFTs) of tau protein. At present, the development of highly sensitive, high cost-effective, and non-invasive diagnostic tools for AD remains a challenge. In the last decades, nanomaterials have emerged as an interesting and useful tool in nanomedicine for diagnostics and therapy. In particular, plasmonic nanoparticles are well-known to display unique optical properties derived from their localized surface plasmon resonance (LSPR), allowing their use as transducers in various sensing configurations and enhancing detection sensitivity. Herein, this review focuses on current advances in in vitro sensing techniques such as Surface-enhanced Raman scattering (SERS), Surface-enhanced fluorescence (SEF), colorimetric, and LSPR using plasmonic nanoparticles for improving the sensitivity in the detection of main biomarkers related to AD in body fluids. Additionally, we refer to the use of plasmonic nanoparticles for in vivo imaging studies in AD.
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Affiliation(s)
- María Paz Oyarzún
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Dr. Carlos Lorca Tobar 964, Independencia, 8380000 Santiago, Chile; (M.P.O.); (A.T.-A.); (P.C.); (P.J.-G.)
- Advanced Center for Chronic Diseases (ACCDIS), Sergio Livingstone #1007, Independencia, 8380492 Santiago, Chile
| | - Andreas Tapia-Arellano
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Dr. Carlos Lorca Tobar 964, Independencia, 8380000 Santiago, Chile; (M.P.O.); (A.T.-A.); (P.C.); (P.J.-G.)
- Advanced Center for Chronic Diseases (ACCDIS), Sergio Livingstone #1007, Independencia, 8380492 Santiago, Chile
| | - Pablo Cabrera
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Dr. Carlos Lorca Tobar 964, Independencia, 8380000 Santiago, Chile; (M.P.O.); (A.T.-A.); (P.C.); (P.J.-G.)
- Advanced Center for Chronic Diseases (ACCDIS), Sergio Livingstone #1007, Independencia, 8380492 Santiago, Chile
| | - Pedro Jara-Guajardo
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Dr. Carlos Lorca Tobar 964, Independencia, 8380000 Santiago, Chile; (M.P.O.); (A.T.-A.); (P.C.); (P.J.-G.)
- Advanced Center for Chronic Diseases (ACCDIS), Sergio Livingstone #1007, Independencia, 8380492 Santiago, Chile
| | - Marcelo J. Kogan
- Departamento de Química Farmacológica y Toxicológica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Dr. Carlos Lorca Tobar 964, Independencia, 8380000 Santiago, Chile; (M.P.O.); (A.T.-A.); (P.C.); (P.J.-G.)
- Advanced Center for Chronic Diseases (ACCDIS), Sergio Livingstone #1007, Independencia, 8380492 Santiago, Chile
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Mariychuk R, Smolková R, Bartošová V, Eliašová A, Grishchenko LM, Diyuk VE, Lisnyak VV. The regularities of the Mentha piperita L. extract mediated synthesis of gold nanoparticles with a response in the infrared range. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-01740-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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40
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Lee CW, Chia ZC, Hsieh YT, Tsai HC, Tai Y, Yu TT, Huang CC. A facile wet-chemistry approach to engineer an Au-based SERS substrate and enhance sensitivity down to ppb-level detection. NANOSCALE 2021; 13:3991-3999. [PMID: 33503079 DOI: 10.1039/d0nr06537d] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A two-dimensional flexible surface-enhanced Raman scattering (SERS) filter substrate provides an alternative strategy for the highly sensitive portable detection of various toxic molecules and biomaterials. Herein, we developed a solid-liquid interfacial reduction reaction to post-engineer a solid Au nanostructure surface on filter paper to improve the SERS effect. Among four reductants (ascorbic acid, l-dopamine, hydroquinone (HQ), and formaldehyde), HQ possessed a larger oxidation overpotential and facilitated homogeneous growth, forming small Au branch-structure nanoparticles from HAuCl4 solution. Due to the surface effect by exposing abundant -OH groups and intrinsic aromatic rings from TNA/HQ on nano-gold, the SERS effect on positively charged analytes near the plasmonic Au surface was enhanced, while forming a protective layer against severe water interruption. The resulting SERS substrate with branched nano-gold provided several SERS-enhanced sites, increased the enhancement by more than 6 times compared to original SERS sensing, and displayed a 1.4-7.4 × 105 analytical enhancement factor, which leads to a limit of detection down to several ppb. Less than 6% of deviation in the SERS intensity at different sensing sites was observed. We successfully improved the primary SERS substrate using a high overpotential reductant. Owing to its soft and flexible properties, the paper-based SERS substrate can be used conveniently in different sizes, pasting on curved materials, detecting additives in fish, and preventing the coffee-ring effect, showing high practicality and potential commercial value in the future.
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Affiliation(s)
- Chien-Wei Lee
- Department of Photonics, Center of Applied Nanomedicine, Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan70101, Taiwan.
| | - Zi Chun Chia
- Department of Photonics, Center of Applied Nanomedicine, Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan70101, Taiwan.
| | - Yi-Ting Hsieh
- Department of Chemistry, Soochow University, Taipei 11102, Taiwan
| | - Hsiao-Chieh Tsai
- Department of Chemistry, Soochow University, Taipei 11102, Taiwan
| | - Yenpo Tai
- Department of Resources Engineering, National Cheng Kung University, Tainan 70101, Taiwan
| | - Teng-To Yu
- Department of Resources Engineering, National Cheng Kung University, Tainan 70101, Taiwan
| | - Chih-Chia Huang
- Department of Photonics, Center of Applied Nanomedicine, Center for Micro/Nano Science and Technology, National Cheng Kung University, Tainan70101, Taiwan.
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Cong T, Wang J, Zhao Y, Zhang D, Fan Z, Pan L. Tip-to-tip assembly of urchin-like Au nanostar at water-oil interface for surface-enhanced Raman spectroscopy detection. Anal Chim Acta 2021; 1154:338323. [PMID: 33736799 DOI: 10.1016/j.aca.2021.338323] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Revised: 02/04/2021] [Accepted: 02/11/2021] [Indexed: 11/18/2022]
Abstract
Au Nanostar (NS) monolayer as a surface enhanced Raman scattering (SERS) substrate has been synthesized by self-assembly at a water-oil interface. It is confirmed from the experiment and simulation results that the Au NS monolayer includes lots of "hot spots" at or between the tips of the Au NSs, enhancing the local electromagnetic fields and giving rise to strong SERS signals sequentially. The limit of detection is determined to be down to 4.2 × 10-12 M for rhodamine 6G. Furthermore, the Au NS monolayer can detect multiple molecules, including thiabendazole, methylene blue, 4-mercaptobenzoic acid, and p-amino thiophenol, indicating that the SERS substrate composed of Au NS monolayer has potential applications in analytical chemistry, food safety, and environmental safety.
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Affiliation(s)
- Tianze Cong
- School of Physics, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116024, PR China
| | - Jianzhen Wang
- School of Physics, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116024, PR China
| | - Yongpeng Zhao
- School of Physics, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116024, PR China; School of Microelectronics, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116024, PR China
| | - Dongmei Zhang
- School of Physics, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116024, PR China
| | - Zeng Fan
- School of Physics, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116024, PR China
| | - Lujun Pan
- School of Physics, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116024, PR China.
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Zhao ZJ, Ahn J, Hwang SH, Ko J, Jeong Y, Bok M, Kang HJ, Choi J, Jeon S, Park I, Jeong JH. Large-Area Nanogap-Controlled 3D Nanoarchitectures Fabricated via Layer-by-Layer Nanoimprint. ACS NANO 2021; 15:503-514. [PMID: 33439612 DOI: 10.1021/acsnano.0c05290] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The fabrication of large-area and flexible nanostructures currently presents various challenges related to the special requirements for 3D multilayer nanostructures, ultrasmall nanogaps, and size-controlled nanomeshes. To overcome these rigorous challenges, a simple method for fabricating wafer-scale, ultrasmall nanogaps on a flexible substrate using a temperature above the glass transition temperature (Tg) of the substrate and by layer-by-layer nanoimprinting is proposed here. The size of the nanogaps can be easily controlled by adjusting the pressure, heating time, and heating temperature. In addition, 3D multilayer nanostructures and nanocomposites with 2, 3, 5, 7, and 20 layers were fabricated using this method. The fabricated nanogaps with sizes ranging from approximately 1 to 40 nm were observed via high-resolution transmission electron microscopy (HRTEM). The multilayered nanostructures were evaluated using focused ion beam (FIB) technology. Compared with conventional methods, our method could not only easily control the size of the nanogaps on the flexible large-area substrate but could also achieve fast, simple, and cost-effective fabrication of 3D multilayer nanostructures and nanocomposites without any post-treatment. Moreover, a transparent electrode and nanoheater were fabricated and evaluated. Finally, surface-enhanced Raman scattering substrates with different nanogaps were evaluated using rhodamine 6G. In conclusion, it is believed that the proposed method can solve the problems related to the high requirements of nanofabrication and can be applied in the detection of small molecules and for manufacturing flexible electronics and soft actuators.
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Affiliation(s)
- Zhi-Jun Zhao
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, South Korea
| | - Junseong Ahn
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, South Korea
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea
| | - Soon Hyoung Hwang
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, South Korea
| | - Jiwoo Ko
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, South Korea
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea
| | - Yongrok Jeong
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, South Korea
| | - Moonjeong Bok
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, South Korea
| | - Hyeok-Joong Kang
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, South Korea
| | - Jungrak Choi
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea
| | - Sohee Jeon
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, South Korea
| | - Inkyu Park
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, South Korea
| | - Jun-Ho Jeong
- Nano-Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, South Korea
- Department of Nano Mechatronics, University of Science and Technology, 217, Gajeongbuk-ro, Yuseong-gu, Daejeon 34103, South Korea
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43
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Das RP, Gandhi VV, Singh BG, Kunwar A. A pH-controlled one-pot synthesis of gold nanostars by using a zwitterionic protein hydrolysate (gelatin): an enhanced radiosensitization of cancer cells. NEW J CHEM 2021. [DOI: 10.1039/d1nj01903a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
One-pot green synthesis of gold nanoparticles of desired shapes is developed by using FDA approved and economic GRAS materials. The gold nanoparticles exhibit radio-sensitization in A549 cells with star shaped nanoparticles showing maximum efficacy.
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Affiliation(s)
- Ram Pada Das
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400085
- India
- Homi Bhabha National Institute
| | - Vishwa V. Gandhi
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400085
- India
- Homi Bhabha National Institute
| | - Beena G. Singh
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400085
- India
- Homi Bhabha National Institute
| | - Amit Kunwar
- Radiation & Photochemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400085
- India
- Homi Bhabha National Institute
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Abstract
As one kind of noble metal nanostructures, the plasmonic gold nanostructures possess unique optical properties as well as good biocompatibility, satisfactory stability, and multiplex functionality. These distinctive advantages make the plasmonic gold nanostructures an ideal medium in developing methods for biosensing and bioimaging. In this review, the optical properties of the plasmonic gold nanostructures were firstly introduced, and then biosensing in vitro based on localized surface plasmon resonance, Rayleigh scattering, surface-enhanced fluorescence, and Raman scattering were summarized. Subsequently, application of the plasmonic gold nanostructures for in vivo bioimaging based on scattering, photothermal, and photoacoustic techniques has been also briefly covered. At last, conclusions of the selected examples are presented and an outlook of this research topic is given.
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Jeong JH, Pradyast A, Shim H, Woo HC, Kim MH. Completely green synthesis of rose-shaped Au nanostructures and their catalytic applications. RSC Adv 2021; 11:34589-34598. [PMID: 35494773 PMCID: PMC9042714 DOI: 10.1039/d1ra06805a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 10/18/2021] [Indexed: 12/17/2022] Open
Abstract
A novel protocol for the one-pot, template/seed-free, and completely green synthesis of rose-shaped Au nanostructures with unique three-dimensional hierarchical structures was developed.
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Affiliation(s)
- Jae Hwan Jeong
- Department of Polymer Engineering, Pukyong National Univeristy, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea
| | - Astrini Pradyast
- Department of Polymer Engineering, Pukyong National Univeristy, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea
| | - Hyeonbo Shim
- Department of Polymer Engineering, Pukyong National Univeristy, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea
| | - Hee-Chul Woo
- Department of Chemical Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea
| | - Mun Ho Kim
- Department of Polymer Engineering, Pukyong National Univeristy, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea
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Höller RPM, Jahn IJ, Cialla-May D, Chanana M, Popp J, Fery A, Kuttner C. Biomacromolecular-Assembled Nanoclusters: Key Aspects for Robust Colloidal SERS Sensing. ACS APPLIED MATERIALS & INTERFACES 2020; 12:57302-57313. [PMID: 33306362 DOI: 10.1021/acsami.0c16398] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Superstructures of gold nanospheres offer augmented surface-enhanced Raman scattering (SERS) activities beyond the limits of their individual building blocks. However, for application as reliable and quantitative colloidal SERS probes, some key aspects need to be considered to combine efficiency and robustness with respect to hotspot excitation, analyte adsorption, signal stability, and colloidal stability. For this purpose, we studied core/satellite superstructures with spherical cores as a simple optically isotropic model system. Superstructures of different core sizes were assembled using bovine serum albumin (BSA), which serves as a non-specific biomacromolecular linker and provides electrosteric stabilization. We show that the "noisy" spectral footprint of the protein coating may serve as an internal standard, which allows accurate monitoring of the adsorption kinetics of analytes. The SERS activity was quantified using 4-mercaptobenzoic acid (MBA) as an aromatic low-molecular-weight model analyte. The molar SERS efficiency was studied by variation of the particle (Au0) and analyte concentrations with a limit of detection of 10-7 M MBA. The practical importance of colloidal stability for robust measurement conditions was demonstrated by comparing the superstructures with their citrate-stabilized or protein-coated building blocks. We explain the theoretical background of hotspot formation by a leader/follower relationship of asymmetric control between the core and the satellites and give practical guidelines for robust colloidal SERS sensing probes.
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Affiliation(s)
- Roland P M Höller
- Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069 Dresden, Germany
| | - Izabella J Jahn
- Leibniz Institute of Photonics Technology (IPHT), Member of the Research Alliance "Leibniz Health Technologies", Albert-Einstein-Str. 9, 07745 Jena, Germany
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
- InfectoGnostics Research Campus Jena, Centre for Applied Research, Philosophenweg 7, 07743 Jena, Germany
| | - Dana Cialla-May
- Leibniz Institute of Photonics Technology (IPHT), Member of the Research Alliance "Leibniz Health Technologies", Albert-Einstein-Str. 9, 07745 Jena, Germany
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
- InfectoGnostics Research Campus Jena, Centre for Applied Research, Philosophenweg 7, 07743 Jena, Germany
| | - Munish Chanana
- Swiss Wood Solutions AG, Überlandstr. 129, 8600 Dübendorf, Switzerland
| | - Jürgen Popp
- Leibniz Institute of Photonics Technology (IPHT), Member of the Research Alliance "Leibniz Health Technologies", Albert-Einstein-Str. 9, 07745 Jena, Germany
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743 Jena, Germany
- InfectoGnostics Research Campus Jena, Centre for Applied Research, Philosophenweg 7, 07743 Jena, Germany
| | - Andreas Fery
- Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069 Dresden, Germany
- Physical Chemistry of Polymeric Materials, Technische Universität Dresden, Hohe Str. 6, 01069 Dresden, Germany
- Cluster of Excellence Centre for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, 01062 Dresden, Germany
| | - Christian Kuttner
- Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069 Dresden, Germany
- Cluster of Excellence Centre for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, 01062 Dresden, Germany
- CIC biomaGUNE, Basque Research and Technology Alliance (BRTA), Paseo de Miramón 182, 20014 Donostia-San Sebastián, Spain
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Liu Y, Zhang W, Phan TH, Chrzanowski W, Rodger A, Wang Y. Positively charged gold-silver nanostar enabled molecular characterization of cancer associated extracellular vesicles. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2020; 12:5908-5915. [PMID: 33290459 DOI: 10.1039/d0ay01770a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Direct surface-enhanced Raman scattering (SERS) has contributed to characterizing extracellular vesicles (EVs) by providing molecular signatures. However, little work has been carried out to understand the heterogeneity of EVs created by different methods or from different biological sources. Herein, we pioneered the use of positively charged gold-silver nanostars to explore the SERS profiles of different EVs. The physical features of EVs from cancer cells including the size, concentration, morphology and surface potential have been characterized via nanoparticle tracking analysis, transmission electron microscopy and zeta potential analysis. The results show that negatively charged EVs are attracted to positively charged gold-silver nanostar surfaces via electrostatic forces resulting in SERS spectra showing characteristic vibrational modes of the different components of EVs (i.e. proteins, lipids and nucleic acids). SERS data were complemented by other spectroscopic techniques including atomic force microscopy-infrared spectroscopy, UV-visible absorbance spectroscopy and fluorescence spectroscopy providing a more complete molecular picture of EVs. SERS signatures of EVs from different origins, batches, and isolation approaches were compared and analyzed. A statistical method (principal component analysis-linear discriminant analysis) was utilized to differentiate EV subtypes. Consequently, a desirable discrimination outcome for blind samples was obtained. This study provides novel insights to deepen our understanding of EV heterogeneity.
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Affiliation(s)
- Yuan Liu
- ARC Centre for Nanoscale BioPhotonics, Macquarie University, NSW 2109, Australia.
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48
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Ortiz-Castillo JE, Gallo-Villanueva RC, Madou MJ, Perez-Gonzalez VH. Anisotropic gold nanoparticles: A survey of recent synthetic methodologies. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213489] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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49
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Structural Study of the Photo-Mediated Growth of Silver Nanoprisms. Molecules 2020; 25:molecules25225413. [PMID: 33228058 PMCID: PMC7699315 DOI: 10.3390/molecules25225413] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 11/15/2020] [Accepted: 11/16/2020] [Indexed: 11/17/2022] Open
Abstract
We present a small-angle X-ray scattering (SAXS) study of the anisotropic photoinduced growth of silver (Ag) nanoprisms in aqueous dispersions. The growth of nearly spherical (<10 nm) Ag particles into large (>40 nm) and thin (<10 nm) triangular nanoprisms induced by 550 nm laser is followed in terms of particle size using indirect and direct methods for irradiation times up to 150 min. During the process, the surface-to-volume ratio of the particles decreased. The SAXS data of the initial solution fit well to the model of polydisperse spheres with pronounced average diameters around 7.4 nm and 10 nm. The data after 45 min irradiation fit well to the model containing approximately the same amount of the initial particles and the end product, the nanoprisms.
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50
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Bose P, Chakraborty P, Mohanty JS, Ray Chowdhuri A, Khatun E, Ahuja T, Mahendranath A, Pradeep T. Atom transfer between precision nanoclusters and polydispersed nanoparticles: a facile route for monodisperse alloy nanoparticles and their superstructures. NANOSCALE 2020; 12:22116-22128. [PMID: 33118573 DOI: 10.1039/d0nr04033a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Reactions between atomically precise noble metal nanoclusters (NCs) have been studied widely in the recent past, but such processes between NCs and plasmonic nanoparticles (NPs) have not been explored earlier. For the first time, we demonstrate spontaneous reactions between an atomically precise NC, Au25(PET)18 (PET = 2-phenylethanethiol), and polydispersed silver NPs with an average diameter of 4 nm and protected with PET, resulting in alloy NPs under ambient conditions. These reactions were specific to the nature of the protecting ligands as no reaction was observed between the Au25(SBB)18 NC (SBB = 4-(tert-butyl)benzyl mercaptan) and the very same silver NPs. The mechanism involves an interparticle exchange of the metal and ligand species where the metal-ligand interface plays a vital role in controlling the reaction. The reaction proceeds through transient Au25-xAgx(PET)n alloy cluster intermediates as observed in time-dependent electrospray ionization mass spectrometry (ESI MS). High-resolution transmission electron microscopy (HRTEM) analysis of the resulting dispersion showed the transformation of polydispersed silver NPs into highly monodisperse gold-silver alloy NPs which assembled to form 2-dimensional superlattices. Using NPs of other average sizes (3 and 8 nm), we demonstrated that size plays an important role in the reactivity as observed in ESI MS and HRTEM.
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Affiliation(s)
- Paulami Bose
- DST Unit of Nanoscience (DST UNS) and Thematic Unit of Excellence (TUE), Department of Chemistry, Indian Institute of Technology Madras, Chennai 600 036, India.
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