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Rethi L, Rethi L, Liu CH, Hyun TV, Chen CH, Chuang EY. Fortification of Iron Oxide as Sustainable Nanoparticles: An Amalgamation with Magnetic/Photo Responsive Cancer Therapies. Int J Nanomedicine 2023; 18:5607-5623. [PMID: 37814664 PMCID: PMC10560484 DOI: 10.2147/ijn.s404394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 05/10/2023] [Indexed: 10/11/2023] Open
Abstract
Due to their non-toxic function in biological systems, Iron oxide NPs (IO-NPs) are very attractive in biomedical applications. The magnetic properties of IO-NPs enable a variety of biomedical applications. We evaluated the usage of IO-NPs for anticancer effects. This paper lists the applications of IO-NPs in general and the clinical targeting of IO-NPs. The application of IONPs along with photothermal therapy (PTT), photodynamic therapy (PDT), and magnetic hyperthermia therapy (MHT) is highlighted in this review's explanation for cancer treatment strategies. The review's study shows that IO-NPs play a beneficial role in biological activity because of their biocompatibility, biodegradability, simplicity of production, and hybrid NPs forms with IO-NPs. In this review, we have briefly discussed cancer therapy and hyperthermia and NPs used in PTT, PDT, and MHT. IO-NPs have a particular effect on cancer therapy when combined with PTT, PDT, and MHT were the key topics of the review and were covered in depth. The IO-NPs formulations may be uniquely specialized in cancer treatments with PTT, PDT, and MHT, according to this review investigation.
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Affiliation(s)
- Lekha Rethi
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
- International PhD Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
| | - Lekshmi Rethi
- International PhD Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
| | - Chia-Hung Liu
- Department of Urology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, 11031, Taiwan
| | - Tin Van Hyun
- International PhD Program in Medicine, College of Medicine, Taipei Medical University, Taipei, 11031, Taiwan
- Department of Interventional Cardiology, Thong Nhat Hospital, Ho Chi Minh City, 700000, Vietnam
| | - Chih-Hwa Chen
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
- International PhD Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
- Department of Orthopedics, Taipei Medical University – Shuang Ho Hospital, New Taipei City, Taiwan
| | - Er-Yuan Chuang
- Graduate Institute of Biomedical Materials and Tissue Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
- International PhD Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan
- Cell Physiology and Molecular Image Research Center, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
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Hosseinpour Moghadam N, Najafi R, Ghanbariasad A, Shiralizadeh Dezfuli A, Jalali A. Improving the selective naked-eye detection of COVID-19 mediated by simultaneously using three different target oligonucleotides coated on plasmonic AuNPs/hexagonal Ag@AuNPs. J Biomol Struct Dyn 2023; 41:14372-14381. [PMID: 36995117 DOI: 10.1080/07391102.2023.2193989] [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: 11/19/2022] [Accepted: 02/10/2023] [Indexed: 03/31/2023]
Abstract
The localized surface plasmon resonance (LSPR) phenomenon provides a versatile property in biosensor technology. This uncommon feature was utilized to produce a homogeneous optical biosensor to detect COVID-19 by the naked-eye readout. In this work, we synthesized two types of plasmonic nanoparticles: (i) AuNPs and (ii) hexagonal core-shell nanoparticles-Au shell on AgNPs (Au@AgNPs). We report herein the development of two colorimetric biosensors employing the efficient targeting and the binding ability for three regions of the COVID-19 genome, that is, S-gene, N-gene and E-gene, at the same time. Two AuNPs and Ag@AuNPs individually coated with three different targets oligonucleotide sequence (TOs) (AuNPs-TOs-mix and Ag@AuNPs-TOs-mix) for simultaneous detection of S-gene, N-gene and E-gene of the COVID-19 virus, using the LSPR and naked-eye methods in the laboratory and biological samples. The target COVID-19 genome RNA detected using the AuNPs-TOs-mix and Ag@AuNPs-TOs-mix can achieve the same sensitivity. The detection ranges by the AuNPs-TOs-mix and Ag@AuNPs-TOs-mix are both sufficiently improved in equal amounts in comparison to any of the AuNPs-TOs and Ag@AuNPs-TOs. The sensitivity of the current COVID-19 biosensors were 94% and 96% based on the number of positive samples detected for AuNPs-TOs-mix and Ag@AuNPs-TOs-mix, respectively. Moreover, all the real-time PCR confirmed negative samples obtained the same results by the biosensor; accordingly, the specificity of this approach got to 100%. The current study reports a selective, reliable, reproducible and visual 'naked-eye' detection of COVID-19, devoid of the requirement of any sophisticated instrumental techniques.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
| | - Rezvan Najafi
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Ali Ghanbariasad
- Department of Medical Biotechnology, Fasa University of Medical Sciences, Fasa, Iran
| | | | - Akram Jalali
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
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Graphene-Encapsulated Silver Nanoparticles for Plasmonic Vapor Sensing. NANOMATERIALS 2022; 12:nano12142473. [PMID: 35889696 PMCID: PMC9319566 DOI: 10.3390/nano12142473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 07/12/2022] [Accepted: 07/14/2022] [Indexed: 02/04/2023]
Abstract
Graphene-covered silver nanoparticles were prepared directly on highly oriented pyrolytic graphite substrates and characterized by atomic force microscopy. UV–Vis reflectance spectroscopy was used to measure the shift in the local surface plasmon resonance (LSPR) upon exposure to acetone, ethanol, 2-propanol, toluene, and water vapor. The optical responses were found to be substance-specific, as also demonstrated by principal component analysis. Point defects were introduced in the structure of the graphene overlayer by O2 plasma. The LSPR was affected by the plasma treatment, but it was completely recovered using subsequent annealing. It was found that the presence of defects increased the response for toluene and water while decreasing it for acetone.
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Phyto-mediated synthesis of nanoparticles and their applications on hydrogen generation on NaBH 4, biological activities and photodegradation on azo dyes: Development of machine learning model. Food Chem Toxicol 2022; 163:112972. [PMID: 35398181 DOI: 10.1016/j.fct.2022.112972] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Revised: 03/22/2022] [Accepted: 03/26/2022] [Indexed: 12/12/2022]
Abstract
This work reports the synthesis of the silver-platinum bimetallic nanoparticles (N@Pt-Ag BNPs) reduced by an ethanolic extract of black seed (Nigella sativa, N) using the green synthesis method, these nanoparticles show a great antibacterial, anticancer, and catalytic activity. The characterization of physicochemical properties of Ag-Pt BNP was carried out using UV-visible spectroscopy (Uv-vis), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and Transmission electron microscope (TEM) analysis. The structural morphology shows that the N@Pt-Ag BNPs are spherical particles with a diameter of 5.6 nm. The cytotoxic effects of N@Pt-Ag BNPs were examined by MTT test in human breast cancer, human colon cancer, human pancreatic cancer, L929-Murine fibroblast cells. N@Pt-Ag BNPs have been observed to be much more effective in breast cancer cell lines. The cytotoxic effect of N@Pt-Ag BNPs against healthy L929-murine fibroblast cell lines was not observed. Also, high antibacterial activity on each of the bacteria Escherichia coli (E. coli), Bacillus subtilis (B. subtilis), Methicillin-resistant Staphylococcus aureus (MRSA), Staphylococcus aureus (S. aureus), where we note that most strains of E. coli and S. aureus were damaged with a 73% percentage, 67% bacterial inhibition respectively. The results of the catalytic activities of N@Pt-Ag BNPs were obtained by performing the hydrolysis experiments of sodium borohydride (NaBH4). According to the results obtained, TOF, enthalpy, entropy, and activation energy, values were found to be 2497.14 h-1, 13.52 kJ/mol, -137.47 J/mol.K, 16.02 kJ/mol, respectively. N@Pt-Ag BNPs were found to be highly effective catalysts for hydrogen production which this was also confirmed by the machine learning model. The photocatalytic activity of N@Pt-Ag BNPs was tested against methylene blue (MB) dye and the highest activity was found as 80%.
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Shape-Dependent Catalytic Activity of Gold and Bimetallic Nanoparticles in the Reduction of Methylene Blue by Sodium Borohydride. Catalysts 2021. [DOI: 10.3390/catal11121442] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
In this study the catalytic activity of different gold and bimetallic nanoparticle solutions towards the reduction of methylene blue by sodium borohydride as a model reaction is investigated. By utilizing differently shaped gold nanoparticles, i.e., spheres, cubes, prisms and rods as well as bimetallic gold–palladium and gold–platinum core-shell nanorods, we evaluate the effect of the catalyst surface area as available gold surface area, the shape of the nanoparticles and the impact of added secondary metals in case of bimetallic nanorods. We track the reaction by UV/Vis measurements in the range of 190–850 nm every 60 s. It is assumed that the gold nanoparticles do not only act as a unit transferring electrons from sodium borohydride towards methylene blue but can promote the electron transfer upon plasmonic excitation. By testing different particle shapes, we could indeed demonstrate an effect of the particle shape by excluding the impact of surface area and/or surface ligands. All nanoparticle solutions showed a higher methylene blue turnover than their reference, whereby gold nanoprisms exhibited 100% turnover as no further methylene blue absorption peak was detected. The reaction rate constant k was also determined and revealed overall quicker reactions when gold or bimetallic nanoparticles were added as a catalyst, and again these were highest for nanoprisms. Furthermore, when comparing gold and bimetallic nanorods, it could be shown that through the addition of the catalytically active second metal platinum or palladium, the dye turnover was accelerated and degradation rate constants were higher compared to those of pure gold nanorods. The results explore the catalytic activity of nanoparticles, and assist in exploring further catalytic applications.
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Szántó G, Csarnovics I, Bonyár A. Numerical investigation of the refractive index sensitivity of Au/Ag core-shell nanostructures for sensing applications. SENSING AND BIO-SENSING RESEARCH 2021. [DOI: 10.1016/j.sbsr.2021.100414] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Stolle HLKS, Csáki A, Dellith J, Fritzsche W. Modification of Surface Bond Au Nanospheres by Chemically and Plasmonically Induced Pd Deposition. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:245. [PMID: 33477641 PMCID: PMC7831503 DOI: 10.3390/nano11010245] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 01/14/2021] [Accepted: 01/15/2021] [Indexed: 11/16/2022]
Abstract
In this work we investigated methods of modifying gold nanospheres bound to a silicon surface by depositing palladium onto the surfaces of single nanoparticles. Bimetallic Au-Pd nanoparticles can thus be gained for use in catalysis or sensor technology. For Pd deposition, two methods were chosen. The first method was the reduction of palladium acetate by ascorbic acid, in which the amounts of palladium acetate and ascorbic acid were varied. In the second method we utilized light-induced metal deposition by making use of the plasmonic effect. Through this method, the surface bond nanoparticles were irradiated with light of wavelengths capable of inducing plasmon resonance. The generation of hot electrons on the particle surface then reduced the palladium acetate in the vicinity of the gold nanoparticle, resulting in palladium-covered gold nanospheres. In our studies we demonstrated the effect of both enhancement methods by monitoring the particle heights over enhancement time by atomic force microscopy (AFM), and investigated the influence of ascorbic acid/Pd acetate concentration as well as the impact of the irradiated wavelengths on the enhancement effect. It could thus be proven that both methods were valid for obtaining a deposition of Pd on the surface of the gold nanoparticles. Deposition of Pd on the gold particles using the light-assisted method could be observed, indicating the impact of the plasmonic effect and hot electron for Pd acetate reduction on the gold particle surface. In the case of the reduction method with ascorbic acid, in addition to Pd deposition on the gold nanoparticle surface, larger pure Pd particles and extended clusters were also generated. The reduction with ascorbic acid however led to a considerably thicker Pd layer of up to 54 nm in comparison to up to 11 nm for the light-induced metal deposition with light resonant to the particle absorption wavelength. Likewise, it could be demonstrated that light of non-resonant wavelengths was not capable of initiating Pd deposition, since a growth of only 1.6 nm (maximum) was observed for the Pd layer.
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Affiliation(s)
- Heike Lisa Kerstin Stephanie Stolle
- Department of Nanobiophotonics, Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Straße 9, D-07745 Jena, Germany; (H.L.K.S.S.); (A.C.)
| | - Andrea Csáki
- Department of Nanobiophotonics, Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Straße 9, D-07745 Jena, Germany; (H.L.K.S.S.); (A.C.)
| | - Jan Dellith
- Competence Center for Micro- and Nanotechnologies, Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Straße 9, D-07745 Jena, Germany;
| | - Wolfgang Fritzsche
- Department of Nanobiophotonics, Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Straße 9, D-07745 Jena, Germany; (H.L.K.S.S.); (A.C.)
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Abstract
Micro and nanoparticles are not only understood as components of materials but as small functional units too. Particles can be designed for the primary transduction of physical and chemical signals and, therefore, become a valuable component in sensing systems. Due to their small size, they are particularly interesting for sensing in microfluidic systems, in microarray arrangements and in miniaturized biotechnological systems and microreactors, in general. Here, an overview of the recent development in the preparation of micro and nanoparticles for sensing purposes in microfluidics and application of particles in various microfluidic devices is presented. The concept of sensor particles is particularly useful for combining a direct contact between cells, biomolecules and media with a contactless optical readout. In addition to the construction and synthesis of micro and nanoparticles with transducer functions, examples of chemical and biological applications are reported.
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Rana S, Bharti A, Singh S, Bhatnagar A, Prabhakar N. Gold-silver core-shell nanoparticle–based impedimetric immunosensor for detection of iron homeostasis biomarker hepcidin. Mikrochim Acta 2020; 187:626. [DOI: 10.1007/s00604-020-04599-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 10/10/2020] [Indexed: 01/20/2023]
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Synthesis and Characterization of Graphene-Silver Nanoparticle Hybrid Materials. MATERIALS 2020; 13:ma13204660. [PMID: 33086668 PMCID: PMC7603374 DOI: 10.3390/ma13204660] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 10/13/2020] [Accepted: 10/15/2020] [Indexed: 01/23/2023]
Abstract
Silver nanoparticles (Ag NPs) play important roles in the development of plasmonic applications. Combining these nanoparticles with graphene can yield hybrid materials with enhanced light–matter interaction. Here, we report a simple method for the synthesis of graphene–silver nanoparticle hybrids on highly oriented pyrolytic graphite (HOPG) substrates. We demonstrate by scanning tunneling microscopy and local tunneling spectroscopy measurements the electrostatic n-type doping of graphene by contact with silver. We show by UV-Vis reflectance investigations that the local surface plasmon resonance (LSPR) of Ag NPs partially covered with graphene is preserved for at least three months, i.e., three times longer than the LSPR of bare Ag NPs. The gradual loss of LSPR is due to the spontaneous sulfurization of non-covered Ag NPs, as revealed by scanning electron microscopy and energy-dispersive X-ray spectroscopy. We show that the Ag NPs completely sandwiched between graphene and HOPG do not sulfurize, even after one year.
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Loiseau A, Zhang L, Hu D, Salmain M, Mazouzi Y, Flack R, Liedberg B, Boujday S. Core-Shell Gold/Silver Nanoparticles for Localized Surface Plasmon Resonance-Based Naked-Eye Toxin Biosensing. ACS APPLIED MATERIALS & INTERFACES 2019; 11:46462-46471. [PMID: 31744295 DOI: 10.1021/acsami.9b14980] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
The localized surface plasmon resonance (LSPR) phenomenon provides a versatile property for biodetection. Herein, this unique feature was employed to build a homogeneous optical biosensor to detect staphylococcal enterotoxin A (SEA) in solution down to very low levels by naked-eye readout. If the initial position of the LSPR band is located in the cyan region, even a small red shift (∼2-3 nm) induced by a refractive index change close to the surface of nanoparticles (NPs) could make the light absorption transit from cyan to green and become visually detectable via a concomitant change in the complementary colors. In this work, we aimed at synthesizing two types of NPs based on compositionally complex core-shell NPs-Ag shells on AuNPs (Au@AgNPs) and Ag inside gold nanoshells (Ag@AuNPs). By controlling the thickness of the shells and their surface chemistry with anti-SEA antibody (Ab), the LSPR band was tuned to near 495 and 520 nm for Ag@AuNPs and Au@AgNPs, respectively. The two particle systems were subsequently applied to spectroscopically and visually detect anti-SEA Ab-SEA interactions. Upon the addition of SEA, large red shifts of the LSPR band were observed spectroscopically and the limits of detection (LODs) were estimated to be 0.2 and 0.4 nM for Au@AgNPs and Ag@AuNPs, respectively. Although the two sets of NPs gave almost identical LODs, the Ag@AuNPs whose initial position of the LSPR band was tuned in the cyan to green region (∼500 nm) displayed a substantially more distinct color change from orange to red, as revealed by the naked eye. We foresee significant potential to this strategy in medical diagnostics and environmental monitoring, especially when basic laboratory infrastructure is sparse or nonexistent.
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Affiliation(s)
- Alexis Loiseau
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface (LRS) , 4 Place Jussieu , F 75005 Paris , France
| | - Lu Zhang
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface (LRS) , 4 Place Jussieu , F 75005 Paris , France
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire (IPCM) , 4 Place Jussieu , F 75005 Paris , France
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering , Nanyang Technological University , Singapore 637553 , Singapore
| | - David Hu
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface (LRS) , 4 Place Jussieu , F 75005 Paris , France
| | - Michèle Salmain
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire (IPCM) , 4 Place Jussieu , F 75005 Paris , France
| | - Yacine Mazouzi
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface (LRS) , 4 Place Jussieu , F 75005 Paris , France
| | - Raphaël Flack
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface (LRS) , 4 Place Jussieu , F 75005 Paris , France
| | - Bo Liedberg
- Centre for Biomimetic Sensor Science, School of Materials Science and Engineering , Nanyang Technological University , Singapore 637553 , Singapore
| | - Souhir Boujday
- Sorbonne Université, CNRS, Laboratoire de Réactivité de Surface (LRS) , 4 Place Jussieu , F 75005 Paris , France
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Loiseau A, Asila V, Boitel-Aullen G, Lam M, Salmain M, Boujday S. Silver-Based Plasmonic Nanoparticles for and Their Use in Biosensing. BIOSENSORS-BASEL 2019; 9:bios9020078. [PMID: 31185689 PMCID: PMC6627098 DOI: 10.3390/bios9020078] [Citation(s) in RCA: 154] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Revised: 05/27/2019] [Accepted: 05/31/2019] [Indexed: 12/11/2022]
Abstract
The localized surface plasmon resonance (LSPR) property of metallic nanoparticles is widely exploited for chemical and biological sensing. Selective biosensing of molecules using functionalized nanoparticles has become a major research interdisciplinary area between chemistry, biology and material science. Noble metals, especially gold (Au) and silver (Ag) nanoparticles, exhibit unique and tunable plasmonic properties; the control over these metal nanostructures size and shape allows manipulating their LSPR and their response to the local environment. In this review, we will focus on Ag-based nanoparticles, a metal that has probably played the most important role in the development of the latest plasmonic applications, owing to its unique properties. We will first browse the methods for AgNPs synthesis allowing for controlled size, uniformity and shape. Ag-based biosensing is often performed with coated particles; therefore, in a second part, we will explore various coating strategies (organics, polymers, and inorganics) and their influence on coated-AgNPs properties. The third part will be devoted to the combination of gold and silver for plasmonic biosensing, in particular the use of mixed Ag and AuNPs, i.e., AgAu alloys or Ag-Au core@shell nanoparticles will be outlined. In the last part, selected examples of Ag and AgAu-based plasmonic biosensors will be presented.
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Affiliation(s)
- Alexis Loiseau
- Laboratoire de Réactivité de Surface (LRS), Sorbonne Université, CNRS, UMR 7197, 4 place Jussieu, F-75005 Paris, France.
| | - Victoire Asila
- Sorbonne Université, Faculté des Sciences et Ingénierie, Master de Chimie, Profil MatNanoBio, 4 place Jussieu, F-75005 Paris, France.
| | - Gabriel Boitel-Aullen
- Sorbonne Université, Faculté des Sciences et Ingénierie, Master de Chimie, Profil MatNanoBio, 4 place Jussieu, F-75005 Paris, France.
| | - Mylan Lam
- Sorbonne Université, Faculté des Sciences et Ingénierie, Master de Chimie, Profil MatNanoBio, 4 place Jussieu, F-75005 Paris, France.
| | - Michèle Salmain
- Institut Parisien de Chimie Moléculaire (IPCM), Sorbonne Université, CNRS, 4 place Jussieu, F-75005 Paris, France.
| | - Souhir Boujday
- Laboratoire de Réactivité de Surface (LRS), Sorbonne Université, CNRS, UMR 7197, 4 place Jussieu, F-75005 Paris, France.
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Schnepf MJ, Brasse Y, Goßler FR, Steiner AM, Obermeier J, Lippitz M, Fery A, König TA. Single Particle Spectroscopy of Radiative Processes in Colloid-to-Film-Coupled Nanoantennas. ACTA ACUST UNITED AC 2018. [DOI: 10.1515/zpch-2018-1109] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
We present a fluorescent emitter (rhodamine B) coupled to a dielectric or metallic interface as well as a metallic cavity to study their radiative decay processes. Supported by finite-difference time-domain (FDTD) simulations, we correlate the non-radiative and radiative decay rates with the absorption and scattering cross section efficiencies, respectively. On a single particle level, we use atomic force microscopy (AFM), scanning electron microscopy (SEM), scattering spectroscopy, fluorescence life time imaging (FLIM) and time-correlated single photon counting (TCSPC) to evaluate the enhanced fluorescence decay at the same location. With this study, we show a colloidal gain material, which can be integrated into lattices using existing directed self-assembled methods to study their coherent energy transfer.
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Affiliation(s)
- Max J. Schnepf
- Leibniz Institute of Polymer Research (IPF), Institute of Physical Chemistry and Polymer Physics , Hohe Str. 6 , 01069 Dresden , Germany
| | - Yannic Brasse
- Leibniz Institute of Polymer Research (IPF), Institute of Physical Chemistry and Polymer Physics , Hohe Str. 6 , 01069 Dresden , Germany
- Cluster of Excellence Center for Advancing Electronics Dresden (CFAED) , Technische Universität Dresden , Dresden , Germany
| | - Fabian R. Goßler
- Leibniz Institute of Polymer Research (IPF), Institute of Physical Chemistry and Polymer Physics , Hohe Str. 6 , 01069 Dresden , Germany
- Cluster of Excellence Center for Advancing Electronics Dresden (CFAED) , Technische Universität Dresden , Dresden , Germany
| | - Anja Maria Steiner
- Leibniz Institute of Polymer Research (IPF), Institute of Physical Chemistry and Polymer Physics , Hohe Str. 6 , 01069 Dresden , Germany
| | - Julian Obermeier
- Lehrstuhl Experimentalphysik III , Department of Physics , University Bayreuth, Universitätsstraße 30 , 95447 Bayreuth , Germany
| | - Markus Lippitz
- Lehrstuhl Experimentalphysik III , Department of Physics , University Bayreuth, Universitätsstraße 30 , 95447 Bayreuth , Germany
| | - Andreas Fery
- Leibniz Institute of Polymer Research (IPF), Institute of Physical Chemistry and Polymer Physics , Hohe Str. 6 , 01069 Dresden , Germany
- Cluster of Excellence Center for Advancing Electronics Dresden (CFAED) , Technische Universität Dresden , Dresden , Germany
- Physical Chemistry of Polymeric Materials , Technische Universität Dresden , Dresden , Germany
| | - Tobias A.F. König
- Leibniz Institute of Polymer Research (IPF), Institute of Physical Chemistry and Polymer Physics , Hohe Str. 6 , 01069 Dresden , Germany
- Cluster of Excellence Center for Advancing Electronics Dresden (CFAED) , Technische Universität Dresden , Dresden , Germany
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Abstract
INTRODUCTION Bioanalytical sensing based on the principle of localized surface plasmon resonance experiences is currently an extremely rapid development. Novel sensors with new kinds of plasmonic transducers and innovative concepts for the signal development as well as read-out principles were identified. This review will give an overview of the development of this field. Areas covered: The focus is primarily on types of transducers by preparation or dimension, factors for optimal sensing concepts and the critical view of the usability of these devices as innovative sensors for bioanalytical applications. Expert commentary: Plasmonic sensor devices offer a high potential for future biosensing given that limiting factors such as long-time stability of the transducers, the required high sensitivity and the cost-efficient production are addressed. For higher sensitivity, the design of the sensor in shape and material has to be combined with optimal enhancement strategies. Plasmonic nanoparticles from bottom-up synthesis with a post-synthetic processing show a high potential for cost-efficient sensor production. Regarding the measurement principle, LSPRi offers a large potential for multiplex sensors and can provide a high-throughput as well as highly paralleled sensing. The main trends are expected towards optimal LSPR concepts which represent cost-efficient and robust point-of-care solutions, and the use of multiplexed devices for clinical applications.
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Affiliation(s)
- Andrea Csáki
- a Department Nanobiophotonics , Leibniz Institute of Photonic Technology (IPHT) , Jena , Germany
| | - Ondrej Stranik
- a Department Nanobiophotonics , Leibniz Institute of Photonic Technology (IPHT) , Jena , Germany
| | - Wolfgang Fritzsche
- a Department Nanobiophotonics , Leibniz Institute of Photonic Technology (IPHT) , Jena , Germany
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Salem MA, Bakr EA, El-Attar HG. Pt@Ag and Pd@Ag core/shell nanoparticles for catalytic degradation of Congo red in aqueous solution. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 188:155-163. [PMID: 28709141 DOI: 10.1016/j.saa.2017.07.002] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Revised: 06/29/2017] [Accepted: 07/05/2017] [Indexed: 06/07/2023]
Abstract
Platinum/silver (Pt@Ag) and palladium/silver (Pd@Ag) core/shell NPs have been synthesized in two steps reaction using the citrate method. The progress of nanoparticle formation was followed by the UV/Vis spectroscopy. Transmission electron microscopy revealed spherical shaped core/shell nanoparticles with average particle diameter 32.17nm for Pt@Ag and 8.8nm for Pd@Ag. The core/shell NPs were further characterized by FT-IR and XRD. Reductive degradation of the Congo red dye was chosen to demonstrate the excellent catalytic activity of these core/shell nanostructures. The nanocatalysts act as electron mediators for the transfer of electrons from the reducing agent (NaBH4) to the dye molecules. Effect of reaction parameters such as nanocatalyst dose, dye and NaBH4 concentrations on the dye degradation was investigated. A comparison between the catalytic activities of both nanocatalysts was made to realize which of them the best in catalytic performance. Pd@Ag was the higher in catalytic activity over Pt@Ag. Such greater activity is originated from the smaller particle size and larger surface area. Pd@Ag nanocatalyst was catalytically stable through four subsequent reaction runs under the utilized reaction conditions. These findings can thus be considered as possible economical alternative for environmental safety against water pollution by dyes.
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Affiliation(s)
- Mohamed A Salem
- Departmentof Chemistry, Faculty of Science, Tanta University, Tanta 31527, Egypt.
| | - Eman A Bakr
- Departmentof Chemistry, Faculty of Science, Tanta University, Tanta 31527, Egypt
| | - Heba G El-Attar
- Departmentof Chemistry, Faculty of Science, Tanta University, Tanta 31527, Egypt; Academy of Scientific Research and Technology, 101 Kasr Al-Ainy St., 11516 Cairo, Egypt
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16
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Zhang H, Cao P, Dou J, Cheng L, Niu T, Zhang G. Double-exponential refractive index sensitivity of metal–semiconductor core–shell nanoparticles: the effects of dual-plasmon resonances and red-shift. RSC Adv 2018; 8:1700-1705. [PMID: 35540883 PMCID: PMC9077213 DOI: 10.1039/c7ra11981j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2017] [Accepted: 12/23/2017] [Indexed: 11/21/2022] Open
Abstract
In order to improve the refractive index sensitivity of a localized surface plasmon resonance (LSPR) sensor, we present a new type of LSPR sensor whose refractive index sensitivity can be improved by greatly increasing the plasmon wavelength red-shift of metal–semiconductor core–shell nanoparticles (CSNs). Using extended Mie theory and Au@Cu2−xS CSNs, we theoretically investigate the optical properties of metal–semiconductor CSNs in the entire near-infrared band. Compared with dielectric–metal and metal–metal CSNs under the same conditions, the metal–semiconductor CSNs have a higher double-exponential sensitivity curve because their core and shell respectively support two LSPRs that greatly increase the LSPR red-shift to the entire near-infrared range. It is worth noting that the sensitivity can be improved effectively by increasing the ratio of the shell-thickness to core-radius, instead of decreasing it in the case of the dielectric–metal CSNs. The underlying reason for the enhancement of sensitivity is the increase of repulsive force with the enlargement of shell thickness, which is different from the dielectric–metal CSNs. This design method not only paves the way for utilizing metal–semiconductor CSNs in biology and chemistry, but also proposes new ideas for the design of sensors with high sensitivity. We present a new type of localized surface plasmon resonance (LSPR) sensor whose refractive index sensitivity can be improved by greatly increasing the plasmon wavelength red-shift of metal–semiconductor core–shell nanoparticles (CSNs).![]()
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Affiliation(s)
- Hailong Zhang
- School of Information Science and Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Pengfei Cao
- School of Information Science and Engineering
- Lanzhou University
- Lanzhou 730000
- China
- Kirchhoff-Institute for Physics
| | - Jie Dou
- School of Information Science and Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Lin Cheng
- School of Information Science and Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Tiaoming Niu
- School of Information Science and Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Guanmao Zhang
- School of Information Science and Engineering
- Lanzhou University
- Lanzhou 730000
- China
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17
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Cao P, Chen H, Zhang H, Cheng L, Niu T. High-sensitivity refractive index of Au@Cu2−xS core–shell nanorods. RSC Adv 2018; 8:35005-35013. [PMID: 35547074 PMCID: PMC9087292 DOI: 10.1039/c8ra07711h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 10/08/2018] [Indexed: 12/27/2022] Open
Abstract
A high refractive index sensitivity of Au@Cu2−xS core–shell nanorods working in the near-infrared is theoretically demonstrated.
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Affiliation(s)
- Pengfei Cao
- School of Information Science and Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Huizhen Chen
- School of Information Science and Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Hailong Zhang
- School of Information Science and Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Lin Cheng
- School of Information Science and Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Tiaoming Niu
- School of Information Science and Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
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18
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A New Strategy for Silver Deposition on Au Nanoparticles with the Use of Peroxidase-Mimicking DNAzyme Monitored via a Localized Surface Plasmon Resonance Technique. SENSORS 2017; 17:s17040849. [PMID: 28406432 PMCID: PMC5424726 DOI: 10.3390/s17040849] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 04/06/2017] [Accepted: 04/10/2017] [Indexed: 01/09/2023]
Abstract
Peroxidase-mimicking DNAzyme was applied as a catalyst of silver deposition on gold nanoparticles. This DNAzyme is formed when hemin binds to the G-quadruplex-forming DNA sequence. Such a system is able to catalyze a redox reaction with a one- or two-electron transfer. The process of silver deposition was monitored via a localized surface plasmon resonance technique (LSPR), which allows one to record scattering spectrum of a single nanoparticle. Our study showed that DNAzyme is able to catalyze silver deposition. The AFM experiments proved that DNAzyme induced the deposition of silver shells of approximately 20 nm thickness on Au nanoparticles (AuNPs). Such an effect is not observed when hemin is absent in the system. However, we noticed non-specific binding of hemin to the capture oligonucleotides on a gold NP probe that also induced some silver deposition, even though the capture probe was unable to form G-quadruplex. Analysis of SEM images indicated that the surface morphology of the silver layer deposited by DNAzyme is different from that obtained for hemin alone. The proposed strategy of silver layer synthesis on gold nanoparticles catalyzed by DNAzyme is an innovative approach and can be applied in bioanalysis (LSPR, electrochemistry) as well as in material sciences.
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19
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Sápi A, Kéri A, Kálomista I, Dobó DG, Ákos Szamosvölgyi ÁS, Juhász KL, Ákos Kukovecz ÁK, Kónya Z, Galbács G. Determination of the platinum concentration of a Pt/silica nanocomposite decorated with ultra small Pt nanoparticles using single particle inductively coupled plasma mass spectrometry. JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY 2017. [DOI: 10.1039/c7ja00039a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The accurate load concentration of ultra small nanoparticles in a Pt/SiO2 nanocomposite is determined by the novel spICP-MS analytical method.
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Affiliation(s)
- András Sápi
- Department of Applied and Environmental Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
| | - Albert Kéri
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
| | - Ildikó Kálomista
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
| | - Dorina G. Dobó
- Department of Applied and Environmental Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
| | | | - Koppány L. Juhász
- Department of Applied and Environmental Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
| | - Ákos Kukovecz Ákos Kukovecz
- Department of Applied and Environmental Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
- MTA-SZTE “Lendület” Porous Nanocomposites Research Group
| | - Zoltán Kónya
- Department of Applied and Environmental Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group
| | - Gábor Galbács
- Department of Inorganic and Analytical Chemistry
- University of Szeged
- 6720 Szeged
- Hungary
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20
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Holt LR, Plowman BJ, Young NP, Tschulik K, Compton RG. The Electrochemical Characterization of Single Core-Shell Nanoparticles. Angew Chem Int Ed Engl 2015; 55:397-400. [DOI: 10.1002/anie.201509008] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 10/14/2015] [Indexed: 12/18/2022]
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21
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Holt LR, Plowman BJ, Young NP, Tschulik K, Compton RG. The Electrochemical Characterization of Single Core-Shell Nanoparticles. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201509008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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22
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Sadecka K, Toudert J, Surma HB, Pawlak DA. Temperature and atmosphere tunability of the nanoplasmonic resonance of a volumetric eutectic-based Bi₂O₃-Ag metamaterial. OPTICS EXPRESS 2015; 23:19098-19111. [PMID: 26367573 DOI: 10.1364/oe.23.019098] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Nanoplasmonic materials are intensively studied due to the advantages they bring in various applied fields such as photonics, optoelectronics, photovoltaics and medicine. However, their large-scale fabrication and tunability are still a challenge. One of the promising ways of combining these two is to use the self-organization mechanism and after-growth engineering as annealing for tuning the properties. This paper reports the development of a bulk nanoplasmonic, Bi2O3-Ag eutectic-based metamaterial with a tunable plasmonic resonance between orange and green wavelengths. The material, obtained by a simple growth technique, exhibits a silver nanoparticle-related localized surface plasmon resonance (LSPR) in the visible wavelength range. We demonstrate the tunability of the LSPR (spectral position, width and intensity) as a function of the annealing temperature, time and the atmosphere. The critical role of the annealing atmosphere is underlined, annealing in vacuum being the most effective option for a broad control of the LSPR. The various potential mechanisms responsible for tuning the localized surface plasmon resonance upon annealing are discussed in relation to the nanostructures of the obtained materials.
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23
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Thiele M, Götz I, Trautmann S, Müller R, Csáki A, Henkel T, Fritzsche W. Wet-chemical Passivation of Anisotropic Plasmonic Nanoparticles for LSPR-sensing by a Silica Shell. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.matpr.2015.04.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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24
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Csáki A, Thiele M, Jatschka J, Dathe A, Zopf D, Stranik O, Fritzsche W. Plasmonic nanoparticle synthesis and bioconjugation for bioanalytical sensing. Eng Life Sci 2014. [DOI: 10.1002/elsc.201400075] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Affiliation(s)
- Andrea Csáki
- Leibniz Institute of Photonic Technology; Jena Germany
| | | | | | - André Dathe
- Leibniz Institute of Photonic Technology; Jena Germany
| | - David Zopf
- Leibniz Institute of Photonic Technology; Jena Germany
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25
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The use of gold-silver core-shell nanorods self-assembled on a glass substrate can substantially improve the performance of plasmonic affinity biosensors. Mikrochim Acta 2014. [DOI: 10.1007/s00604-014-1285-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Knauer A, Eisenhardt A, Krischok S, Koehler JM. Nanometer precise adjustment of the silver shell thickness during automated Au-Ag core-shell nanoparticle synthesis in micro fluid segment sequences. NANOSCALE 2014; 6:5230-5238. [PMID: 24687008 DOI: 10.1039/c3nr06438g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this work, a wet-chemical synthesis method for gold-silver core-shell particles with nanometer precise adjustable silver shell thicknesses is presented. Typically wet-chemical syntheses lead to relatively large diameter size distributions and losses in the yield of the desired particle structure due to thermodynamical effects. With the here explained synthesis method in micro fluidic segment sequences, a combinatorial in situ parameter screening of the reactant concentration ratios by programmed flow rate shifts in conjunction with efficient segment internal mixing conditions is possible. The highly increased mixing rates ensure a homogeneous shell deposition on all presented gold core particles while the amount of available silver ions was adjusted by automated flow rate courses, from which the synthesis conditions for exactly tunable shell thicknesses between 1.1 and 6.1 nm could be derived. The findings according to the homogeneity of size and particle structure were confirmed by differential centrifugal sedimentation (DCS), scanning and transmission electron microscopy (SEM, TEM) and X-ray photoelectron spectroscopy (XPS) measurements. In UV-Vis measurements, a significant contribution of the core metal was found in the shape of the extinction spectra in the case of thin shells. These results were confirmed by theoretical calculations.
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Affiliation(s)
- Andrea Knauer
- Technische Universität Ilmenau, Institut für Mikro- und Nanotechnologien MacroNano®, Gustav-Kirchhoff-Straße 7, D-98693 Ilmenau, Germany.
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27
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Dong P, Lin Y, Deng J, Di J. Ultrathin gold-shell coated silver nanoparticles onto a glass platform for improvement of plasmonic sensors. ACS APPLIED MATERIALS & INTERFACES 2013; 5:2392-2399. [PMID: 23477284 DOI: 10.1021/am4004254] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A facile and effective approach for the improvement of localized surface plasmon resonance (LSPR) biosensors based on silver-core and gold-shell nanoparticles (Ag@AuNPs) on a glass substrate was investigated. Silver nanoparticles (core) with thin gold shells on a transparent indium tin oxide (ITO) coated glass surface were prepared by sequential electrodeposition, and the influence of the thickness of the gold shell was systematically investigated. The experimental results indicate that the properties of an LSPR band of ultrathin (∼1.3 nm) gold-shell coated silver nanoparticles are very similar to those of silver nanoparticles alone. The refractive index (RI) sensitivities of the metal nanostructures are calculated as 123 and 220 nm/RIU for the silver cores (∼480 nm of LSPR peak) and Ag@AuNPs (∼503 nm of LSPR peak), respectively, on the ITO substrate. The RI sensitivity of Ag@AuNPs was significantly enhanced by coating the silver nanoparticles with an ultrathin gold shell. This core-shell platform was also applied to the fabrication of biosensors. Thus, this strategy can be used to construct inexpensive, stable, versatile, and sensitive LSPR biosensors.
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Affiliation(s)
- Peipei Dong
- College of Chemistry, Chemical Engineering and Material Science, Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, Soochow University, Suzhou, Jiangsu 215123, People's Republic of China
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28
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Lu L, Burkey G, Halaciuga I, Goia DV. Core-shell gold/silver nanoparticles: synthesis and optical properties. J Colloid Interface Sci 2012; 392:90-95. [PMID: 23127875 DOI: 10.1016/j.jcis.2012.09.057] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 08/27/2012] [Accepted: 09/26/2012] [Indexed: 10/27/2022]
Abstract
Highly dispersed gold-silver core-shell nanoparticles were synthesized in a two-step process. The stabilizer-free gold core particles with an average diameter of ~30 nm were first precipitated by rapid reduction of HAuCl(4) with l-ascorbic acid. Thin continuous silver shells of variable thickness were subsequently obtained by reducing controlled amounts of silver nitrate added in the gold sol. The plasmon band of gold gradually blue-shifted and a peak characteristic for silver eventually emerged as the amount of deposited silver increased. A strong and well-defined silver absorption band was recorded when the Ag content exceeded 60 wt.%. It is shown that the concentration of Cl(-) ions in the gold precursor solution plays a critical role in the stability of the bi-metallic sol and the structure of the deposited silver shell.
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Affiliation(s)
- Lu Lu
- Center for Advanced Materials Processing, Clarkson University, Potsdam, NY 13699-5814, USA
| | - Gwendolyn Burkey
- Center for Advanced Materials Processing, Clarkson University, Potsdam, NY 13699-5814, USA
| | - Ionel Halaciuga
- Center for Advanced Materials Processing, Clarkson University, Potsdam, NY 13699-5814, USA
| | - Dan V Goia
- Center for Advanced Materials Processing, Clarkson University, Potsdam, NY 13699-5814, USA.
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29
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Bhavani Devi L, Berchmans S, Mandal AB. Highly sensitive detection of proteins using voltammetric assay in the presence of silver nanostructures. J Electroanal Chem (Lausanne) 2012. [DOI: 10.1016/j.jelechem.2011.11.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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30
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Deng J, Du J, Wang Y, Tu Y, Di J. Synthesis of ultrathin silver shell on gold core for reducing substrate effect of LSPR sensor. Electrochem commun 2011. [DOI: 10.1016/j.elecom.2011.10.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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