1
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Yin M, Jiao J, Lu L, Hu B, Xue L, Dai F, Wang X, Wang Z, Wang T, Chen Q. A simultaneous strategy with multiple-signal amplification and self-calibration for ultrasensitive assay of miRNA-21 based on 3D MNPs-IL-rGO-AuNPs. Biosens Bioelectron 2024; 249:116009. [PMID: 38199082 DOI: 10.1016/j.bios.2024.116009] [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: 10/26/2023] [Revised: 12/17/2023] [Accepted: 01/04/2024] [Indexed: 01/12/2024]
Abstract
MicroRNA-21 (miRNA-21) is a significant biomarker for the development and progression of diverse cancers but is present in relatively low concentrations. Detecting such low-abundance molecules accurately can be challenging, especially in early-stage cancers where the concentration may be even lower. Herein, a self-calibration biosensing platform based on 3D novel MNPs-IL-rGO-AuNPs nanocomposites was successfully established for the ultrasensitive detection of miRNA-21. Duplex-specific nuclease (DSN) was introduced to recognize perfectly matched duplexes and trigger target recycling, enhancing the specificity and sensitivity of the biosensor. DSN-assisted target recycling, in conjunction with magnetic separation enrichment and high-performance MNPs-IL-rGO-AuNPs, collectively formed a multiple-signal amplification strategy. The obtained biosensor could output dual signals in both electrochemical and fluorescent modes, enabling self-correcting detection to enhance the accuracy. The obtained dual-mode biosensor prepared exhibited a wide detection range from 5 fM to 100 nM with a remarkably low LOD of 1.601 fM. It accomplished the sensitive evaluation of miRNA-21 in total RNA extracted from various human cancer cell lines and normal cell lines. Additionally, the greatly satisfactory outcomes in the analysis of human serum samples suggested that the proposed biosensor was a powerful screening candidate in early clinical diagnosis of cancer.
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Affiliation(s)
- Mengai Yin
- The Key Laboratory of Bioactive Materials Ministry of Education, College of Life Science, Nankai University, Weijin Road No.94, Tianjin, 300071, PR China
| | - Jun Jiao
- The Key Laboratory of Bioactive Materials Ministry of Education, College of Life Science, Nankai University, Weijin Road No.94, Tianjin, 300071, PR China.
| | - Lina Lu
- The Key Laboratory of Bioactive Materials Ministry of Education, College of Life Science, Nankai University, Weijin Road No.94, Tianjin, 300071, PR China
| | - Bingxin Hu
- The Key Laboratory of Bioactive Materials Ministry of Education, College of Life Science, Nankai University, Weijin Road No.94, Tianjin, 300071, PR China
| | - Lan Xue
- The Key Laboratory of Bioactive Materials Ministry of Education, College of Life Science, Nankai University, Weijin Road No.94, Tianjin, 300071, PR China
| | - Fuju Dai
- The Key Laboratory of Bioactive Materials Ministry of Education, College of Life Science, Nankai University, Weijin Road No.94, Tianjin, 300071, PR China
| | - Xiangrui Wang
- The Key Laboratory of Bioactive Materials Ministry of Education, College of Life Science, Nankai University, Weijin Road No.94, Tianjin, 300071, PR China
| | - Zhijie Wang
- The Key Laboratory of Bioactive Materials Ministry of Education, College of Life Science, Nankai University, Weijin Road No.94, Tianjin, 300071, PR China
| | - Tong Wang
- The Key Laboratory of Bioactive Materials Ministry of Education, College of Life Science, Nankai University, Weijin Road No.94, Tianjin, 300071, PR China
| | - Qiang Chen
- The Key Laboratory of Bioactive Materials Ministry of Education, College of Life Science, Nankai University, Weijin Road No.94, Tianjin, 300071, PR China.
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Elnagar MM, Liessem J, Im C, Mitoraj D, Kibler LA, Neumann C, Turchanin A, Leiter R, Kaiser U, Jacob T, Krivtsov I, Beranek R. Water-soluble ionic carbon nitride as unconventional stabilizer for highly catalytically active ultrafine gold nanoparticles. NANOSCALE 2023; 15:19268-19281. [PMID: 37990869 DOI: 10.1039/d3nr03375a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2023]
Abstract
Ultrafine metal nanoparticles (NPs) hold promise for applications in many fields, including catalysis. However, ultrasmall NPs are typically prone to aggregation, which often leads to performance losses, such as severe deactivation in catalysis. Conventional stabilization strategies (e.g., immobilization, embedding, or surface modification by capping agents) are typically only partly effective and often lead to loss of catalytic activity. Herein, a novel type of stabilizers based on water-soluble ionic (K+ and Na+ containing) polymeric carbon nitride (i.e., K,Na-poly(heptazine imide) = K,Na-PHI) is reported that enables effective stabilization of highly catalytically active ultrafine (size of ∼2-3 nm) gold NPs. Experimental and theoretical comparative studies using different structural units of K,Na-PHI (i.e., cyanurate, melonate, cyamelurate) indicate that the presence of functionalized heptazine moieties is crucial for the synthesis and stabilization of small Au NPs. The K,Na-PHI-stabilized Au NPs exhibit remarkable dispersibility and outstanding stability even in solutions of high ionic strength, which is ascribed to more effective charge delocalization in the large heptazine units, resulting in more effective electrostatic stabilization of Au NPs. The outstanding catalytic performance of Au NPs stabilized by K,Na-PHI is demonstrated using the selective reduction of 4-nitrophenol to 4-aminophenol by NaBH4 as a model reaction, in which they outperform even the benchmark "naked" Au NPs electrostatically stabilized by excess NaBH4. This work thus establishes ionic carbon nitrides (PHI) as alternative capping agents enabling effective stabilization without compromising surface catalysis, and opens up a route for further developments in utilizing PHI-based stabilizers for the synthesis of high-performance nanocatalysts.
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Affiliation(s)
- Mohamed M Elnagar
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany.
| | - Johannes Liessem
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany.
| | - Changbin Im
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany.
| | - Dariusz Mitoraj
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany.
| | - Ludwig A Kibler
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany.
| | - Christof Neumann
- Institute of Physical Chemistry, Jena Center for Soft Matter (JCSM) and Center for Energy and Environmental Chemistry Jena (CEEC), Friedrich Schiller University Jena, Lessingstr. 10, 07743 Jena, Germany
| | - Andrey Turchanin
- Institute of Physical Chemistry, Jena Center for Soft Matter (JCSM) and Center for Energy and Environmental Chemistry Jena (CEEC), Friedrich Schiller University Jena, Lessingstr. 10, 07743 Jena, Germany
| | - Robert Leiter
- Electron Microscopy of Materials Science, Central Facility for Electron Microscopy, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Ute Kaiser
- Electron Microscopy of Materials Science, Central Facility for Electron Microscopy, Ulm University, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Timo Jacob
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany.
- Helmholtz-Institute-Ulm (HIU) Electrochemical Energy Storage, Helmholtzstr. 11, 89081, Ulm, Germany
- Karlsruhe Institute of Technology (KIT), P.O. Box 3640, 76021, Karlsruhe, Germany
| | - Igor Krivtsov
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany.
- Department of Chemical and Environmental Engineering, University of Oviedo, 33006 Oviedo, Spain
| | - Radim Beranek
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081 Ulm, Germany.
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Zhou T, Jiang X. Modulating luminescence and assembled shapes of ultrasmall Au nanoparticles towards hierarchical information encryption. Chem Sci 2022; 13:12107-12113. [PMID: 36349114 PMCID: PMC9601247 DOI: 10.1039/d2sc04031j] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Accepted: 09/25/2022] [Indexed: 08/26/2023] Open
Abstract
Because of their intriguing luminescence performances, ultrasmall Au nanoparticles (AuNPs) and their assemblies hold great potential in diverse applications, including information security. However, modulating luminescence and assembled shapes of ultrasmall AuNPs to achieve a high-security level of stored information is an enduring and significant challenge. Herein, we report a facile strategy using Pluronic F127 as an adaptive template for preparing Au nanoassemblies (AuNAs) with controllable structures and tunable luminescence to realize hierarchical information encryption through modulating excitation light. The template guided ultrasmall AuNP in situ growth in the inner core and assembled these ultrasmall AuNPs into intriguing necklace-like or spherical nanoarchitectures. By regulating the type of ligand and reductant, their emission was also tunable, ranging from green to the second near-infrared (NIR-II) region. The excitation-dependent emission could be shifted from red to NIR-II, and this significant shift was considerably distinct from the small range variation of conventional nanomaterials in the visible region. In virtue of tunable luminescence and controllable structures, we expanded their potential utility to hierarchical information encryption, and the true information could be decrypted in a two-step sequential manner by regulating excitation light. These findings provided a novel pathway for creating uniform nanomaterials with desired functions for potential applications in information security.
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Affiliation(s)
- Tingyao Zhou
- Shenzhen Key Laboratory of Smart Healthcare Engineering, Department of Biomedical Engineering, Southern University of Science and Technology 1088 Xueyuan Road, Nanshan District Shenzhen Guangdong 518055 P. R. China
| | - Xingyu Jiang
- Shenzhen Key Laboratory of Smart Healthcare Engineering, Department of Biomedical Engineering, Southern University of Science and Technology 1088 Xueyuan Road, Nanshan District Shenzhen Guangdong 518055 P. R. China
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Hernández-Cruz MG, Solís-Casados DA, Toledo-Antonio JA, Vargas-García JR, Estrada-Flores M, Ángeles-Chávez C, Cortés-Jácome MA, Encarnación-Gómez C. Malachite Green Dye Decoloration over Au/TiO 2-Nanotubes Photocatalyst under Simulate Visible-Light Irradiation. MATERIALS (BASEL, SWITZERLAND) 2022; 15:6209. [PMID: 36143524 PMCID: PMC9504229 DOI: 10.3390/ma15186209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 08/26/2022] [Accepted: 08/28/2022] [Indexed: 06/16/2023]
Abstract
Au nanoparticles were supported on TiO2 nanotubes by a novel vapor phase impregnation approach (VPI) using gold dimethyl-acetylacetonate as a precursor. This study aimed to evaluate the capacity of these materials in the photodecoloration of malachite green dye, with the vision to correlate the chemical, structural, morphological, and optical properties with its photocatalytic performance. The photocatalysts were characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectronic spectroscopy (XPS), electronic microscopy (HAADF-STEM and HRTEM), and UV-vis spectroscopy. The techniques mentioned above made it possible to detect the presence of small gold nanoparticles (around 3.1 nm), with a high apparent dispersion even at high metal loading for all analyzed systems. According to the XPS results, the Au nanoparticles remain reduced (Au°), and they have a high electronic interaction with TiO2, which eventually originates an electronic exchange between them and consequently a decrease in the band gap energy. In addition, the surface plasmonic resonance observed through UV-vis spectroscopy of the Au nanoparticles are factors that can be related to the high decoloration observed in these photocatalysts, specifically in the 15 wt% Au material, which achieves maximum photodecoloration of malachite green dye at 93%.
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Affiliation(s)
- María Guadalupe Hernández-Cruz
- División Académica Multidisciplinaria de Jalpa de Méndez, Universidad Juárez Autónoma de Tabasco, Carr. Villahermosa-Comalcalco Km 27 S/N, Ranchería Ribera Alta, Jalpa de Méndez 86205, Mexico
| | - Dora Alicia Solís-Casados
- Centro Conjunto de Investigación en Química Sustentable UAEM-UNAM, Universidad Autónoma del Estado de México, Toluca 50200, Mexico
| | | | | | - Miriam Estrada-Flores
- Instituto Politécnico Nacional, Escuela Superior de Ingeniería Química e Industrias Extractivas, DIQI, Ciudad de México 07330, Mexico
| | - Carlos Ángeles-Chávez
- Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas # 152, Ciudad de México 07730, Mexico
| | | | - Cecilia Encarnación-Gómez
- División Académica Multidisciplinaria de Jalpa de Méndez, Universidad Juárez Autónoma de Tabasco, Carr. Villahermosa-Comalcalco Km 27 S/N, Ranchería Ribera Alta, Jalpa de Méndez 86205, Mexico
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5
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Kumar A, Choudhary P, Kumar A, Camargo PHC, Krishnan V. Recent Advances in Plasmonic Photocatalysis Based on TiO 2 and Noble Metal Nanoparticles for Energy Conversion, Environmental Remediation, and Organic Synthesis. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2101638. [PMID: 34396695 DOI: 10.1002/smll.202101638] [Citation(s) in RCA: 76] [Impact Index Per Article: 38.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 06/06/2021] [Indexed: 05/24/2023]
Abstract
Plasmonic photocatalysis has emerged as a prominent and growing field. It enables the efficient use of sunlight as an abundant and renewable energy source to drive a myriad of chemical reactions. For instance, plasmonic photocatalysis in materials comprising TiO2 and plasmonic nanoparticles (NPs) enables effective charge carrier separation and the tuning of optical response to longer wavelength regions (visible and near infrared). In fact, TiO2 -based materials and plasmonic effects are at the forefront of heterogeneous photocatalysis, having applications in energy conversion, production of liquid fuels, wastewater treatment, nitrogen fixation, and organic synthesis. This review aims to comprehensively summarize the fundamentals and to provide the guidelines for future work in the field of TiO2 -based plasmonic photocatalysis comprising the above-mentioned applications. The concepts and state-of-the-art description of important parameters including the formation of Schottky junctions, hot electron generation and transfer, near field electromagnetic enhancement, plasmon resonance energy transfer, scattering, and photothermal heating effects have been covered in this review. Synthetic approaches and the effect of various physicochemical parameters in plasmon-mediated TiO2 -based materials on performances are discussed. It is envisioned that this review may inspire and provide insights into the rational development of the next generation of TiO2 -based plasmonic photocatalysts with target performances and enhanced selectivities.
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Affiliation(s)
- Ajay Kumar
- School of Basic Sciences and Adv. Mater. Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India
| | - Priyanka Choudhary
- School of Basic Sciences and Adv. Mater. Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India
| | - Ashish Kumar
- School of Basic Sciences and Adv. Mater. Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India
| | - Pedro H C Camargo
- University of Helsinki, Department of Chemistry, A.I. Virtasen aukio 1, Helsinki, Finland
| | - Venkata Krishnan
- School of Basic Sciences and Adv. Mater. Research Center, Indian Institute of Technology Mandi, Kamand, Mandi, Himachal Pradesh, 175075, India
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6
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Colorimetric Measurement of Deltamethrin Pesticide Using a Paper Sensor Based on Aggregation of Gold Nanoparticles. COATINGS 2021. [DOI: 10.3390/coatings12010038] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Deltamethrin (DEL) is one of the most commonly used pyrethroid pesticides that can cause serious harms to the ecological environment and human health. Herein, we have developed a paper-based colorimetric sensor impregnated with gold nanoparticles (AuNPs) for on-site determination of DEL pesticide. AuNPs show obvious color change on paper device with the presence of DEL. Measuring the gray intensity of the AuNPs on the reaction zone of the paper sensor allows accurate quantitative analysis. The detection mechanism of DEL on paper sensor was confirmed by UV-Vis spectrophotometry (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), and transmission electron microscope (TEM). Under optimal conditions, the colorimetric sensor exhibited high sensitivity, rapid detection, and low detection limit within the values stipulated by Chinese detection standards (LOD = 0.584 mg/L). Besides, detecting DEL in vegetable and fruit samples also gave satisfying results, which were much consistent with those obtained by spectrophotometry. Overall, this work provided a user-friendly, cost-effective and visualized detection platform, which could be applied to rapidly detect DEL pesticides in the food safety field.
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7
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Jana SK, Gucchait A, Paul S, Saha T, Acharya S, Hoque KM, Misra AK, Chatterjee BK, Chatterjee T, Chakrabarti P. Virstatin-Conjugated Gold Nanoparticle with Enhanced Antimicrobial Activity against the Vibrio cholerae El Tor Biotype. ACS APPLIED BIO MATERIALS 2021; 4:3089-3100. [DOI: 10.1021/acsabm.0c01483] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Swapan Kumar Jana
- Department of Biochemistry, Bose Institute, P1/12 CIT Scheme VIIM, Kolkata 700054, India
| | - Arin Gucchait
- Division of Molecular Medicine, Bose Institute, P1/12 CIT Scheme VIIM, Kolkata 700054, India
| | - Susmita Paul
- School of Applied & Interdisciplinary Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Tultul Saha
- Division of Molecular Pathophysiology, National Institute of Cholera & Enteric Diseases, P-33 CIT Road, Scheme XM, Beliaghata, Kolkata 700010, India
| | - Somobrata Acharya
- School of Applied & Interdisciplinary Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Kazi Mirajul Hoque
- Division of Molecular Pathophysiology, National Institute of Cholera & Enteric Diseases, P-33 CIT Road, Scheme XM, Beliaghata, Kolkata 700010, India
| | - Anup Kumar Misra
- Division of Molecular Medicine, Bose Institute, P1/12 CIT Scheme VIIM, Kolkata 700054, India
| | - Barun K. Chatterjee
- Department of Physics, Bose Institute, 93/1 A.P.C. Road, Kolkata 700009, India
| | - Tanaya Chatterjee
- Department of Biochemistry, Bose Institute, P1/12 CIT Scheme VIIM, Kolkata 700054, India
| | - Pinak Chakrabarti
- Department of Biochemistry, Bose Institute, P1/12 CIT Scheme VIIM, Kolkata 700054, India
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Félix LL, Porcel JM, Aragón FFH, Pacheco-Salazar DG, Sousa MH. Simple synthesis of gold-decorated silica nanoparticles by in situ precipitation method with new plasmonic properties. SN APPLIED SCIENCES 2021. [DOI: 10.1007/s42452-021-04456-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Abstract
AbstractWe describe a simple method for the preparation of gold-decorated silica (SiO2) nanoparticles (NPs) by the in situ precipitation method using simple BH4− ions reduction as a procedure, where BH4− ions are adsorbed onto PEI-functionalized SiO2 NPs for stabilizing and reducing gold ions onto PEI-SiO2 surface in water under ambient conditions. The result was 3-nm gold nanoshell NPs attached to SiO2 core (~ 75 nm) with a surface plasmon resonance (SPR) at ~ 680 nm. SPR band is associated with Au NP aggregates that arise from strong interparticle interaction. This is an alternative to the gold-seeding methods and the use of anionic gold species for the obtention of gold-decorated SiO2 NPs with an important red-shift in UV–Vis absorption and with potential applications in biosensors and photothermal therapy.
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9
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Saira F, Saleemi S, Razzaq H, Qureshi R. Spectrophotometric analysis of stability of gold nanoparticles during catalytic reduction of 4-nitrophenol. Turk J Chem 2021; 45:82-91. [PMID: 33679155 PMCID: PMC7925321 DOI: 10.3906/kim-2004-52] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 10/13/2020] [Indexed: 11/25/2022] Open
Abstract
Spectrophotometric monitoring of 4-nitrophenol (4-NP) reduction by sodium borohydride (NaBH4) using gold nanoparticles (GNPs) as a catalyst has been extensively studied, but the stability of GNPs in terms of change in the surface plasmon resonance (SPR) at different temperatures has not been explored. In the present investigation, our aim was to evaluate the SPR stability of GNPs as a catalyst during the reduction of 4-NP at different elevated temperatures (i.e. 30–60 °C) and sodium borohydride concentrations. Sensitivity of this degradation process toward concentration of GNPs at a range of temperatures is also evaluated. The spectrophotometric results reveal that up to 45 °C, 12 ± 1.5 nm catalyst has a consistent optical density (OD) during the entire 4-NP reduction process, which is related to the surface integrity of catalyst atoms. As the temperature approached 50 °C, the OD gradually decreased and showed a blue shift as the reaction proceeded, which could be related to a decrease in particle size or surface dissolution of gold atoms. The present study may find application in the design of catalysts for the reduction of organic pollutants in industrial wastewater at a range of temperatures.
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Affiliation(s)
- Farhat Saira
- Nanoscience and Technical Division, National Centre for Physics (NCP), Islamabad Pakistan
| | - Samia Saleemi
- Department of Chemistry, Quaid-i-Azam University, Islamabad Pakistan
| | - Humaira Razzaq
- Department of Chemistry, University of Wah, Rawalpindi Pakistan
| | - Rumana Qureshi
- Department of Chemistry, Quaid-i-Azam University, Islamabad Pakistan
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10
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Lee D, Hussain S, Yeo J, Pang Y. Adsorption of dipeptide L-alanyl-L-tryptophan on gold colloidal nanoparticles studied by surface-enhanced Raman spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 247:119064. [PMID: 33091739 DOI: 10.1016/j.saa.2020.119064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 09/08/2020] [Accepted: 10/06/2020] [Indexed: 06/11/2023]
Abstract
Surface adsorption of a dipeptide L-alanyl-L-tryptophan (Ala-Trp) on gold nanoparticles reduced by citrate (CT) and borohydride (BH) ions was investigated by a surface-enhanced Raman scattering (SERS) technique. Two distinct SERS spectra of Ala-Trp depending on the types of gold nanoparticles were observed, and the vibrational assignments were based on the density functional theory simulations and the previous SERS results of Trp. Ala-Trp mainly adsorbs through the amine group on CT gold nanoparticles with a perpendicular orientation of the indole ring to the surface. In contrast, the adsorption occurs via the π electrons of the indole ring on the BH gold surfaces while maintaining a flat geometry of the indole ring to the surface. The amide I band of Ala-Trp was observed only with the CT gold colloids in acidic and neutral conditions where partial surface adsorption via the amide group is expected.
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Affiliation(s)
- Daedu Lee
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Shafqat Hussain
- Department of Physics and Photon Science, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Juhyun Yeo
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Yoonsoo Pang
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdangwagi-ro, Buk-gu, Gwangju 61005, Republic of Korea.
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Hiekel K, Jungblut S, Georgi M, Eychmüller A. Tailoring the Morphology and Fractal Dimension of 2D Mesh-like Gold Gels. Angew Chem Int Ed Engl 2020; 59:12048-12054. [PMID: 32315501 PMCID: PMC7383771 DOI: 10.1002/anie.202002951] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Indexed: 12/31/2022]
Abstract
As there is a great demand of 2D metal networks, especially out of gold for a plethora of applications we show a universal synthetic method via phase boundary gelation which allows the fabrication of networks displaying areas of up to 2 cm2. They are transferred to many different substrates: glass, glassy carbon, silicon, or polymers such as PDMS. In addition to the standardly used web thickness, the networks are parametrized by their fractal dimension. By variation of experimental conditions, we produced web thicknesses between 4.1 nm and 14.7 nm and fractal dimensions in the span of 1.56 to 1.76 which allows to tailor the structures to fit for various applications. Furthermore, the morphology can be tailored by stacking sheets of the networks. For each different metal network, we determined its optical transmission and sheet resistance. The obtained values of up to 97 % transparency and sheet resistances as low as 55.9 Ω/sq highlight the great potential of the obtained materials.
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Affiliation(s)
- Karl Hiekel
- Physical Chemistry, Technische Universität Dresden, Bergstrasse 66b, 01062, Dresden, Germany
| | - Swetlana Jungblut
- Physical Chemistry, Technische Universität Dresden, Bergstrasse 66b, 01062, Dresden, Germany
| | - Maximilian Georgi
- Physical Chemistry, Technische Universität Dresden, Bergstrasse 66b, 01062, Dresden, Germany
| | - Alexander Eychmüller
- Physical Chemistry, Technische Universität Dresden, Bergstrasse 66b, 01062, Dresden, Germany
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12
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Hiekel K, Jungblut S, Georgi M, Eychmüller A. Tailoring the Morphology and Fractal Dimension of 2D Mesh‐like Gold Gels. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Karl Hiekel
- Physical Chemistry Technische Universität Dresden Bergstrasse 66b 01062 Dresden Germany
| | - Swetlana Jungblut
- Physical Chemistry Technische Universität Dresden Bergstrasse 66b 01062 Dresden Germany
| | - Maximilian Georgi
- Physical Chemistry Technische Universität Dresden Bergstrasse 66b 01062 Dresden Germany
| | - Alexander Eychmüller
- Physical Chemistry Technische Universität Dresden Bergstrasse 66b 01062 Dresden Germany
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Shankar R, Mahavar N. A catalytic study of water dispersed gold nanoparticles for the hydrolytic oxidation of diorganosilanes – en route formation of a Pickering catalyst and synthesis of tetraorganodisiloxane-1,3-diols. Dalton Trans 2020; 49:16633-16637. [DOI: 10.1039/d0dt03252b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This study unfolds the formation of a AuNP-stabilized Pickering catalyst (PIC) en route to the hydrolytic oxidation of diorganosilanes. The method offers a viable route for the synthesis of disiloxane-1,3-diols.
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Affiliation(s)
- Ravi Shankar
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi
- India
| | - Nidhi Mahavar
- Department of Chemistry
- Indian Institute of Technology Delhi
- New Delhi
- India
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14
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Green synthesis of silver nanoparticles using the seaweed Gracilaria birdiae and their antibacterial activity. ARAB J CHEM 2019. [DOI: 10.1016/j.arabjc.2016.04.014] [Citation(s) in RCA: 102] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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15
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Decarolis D, Odarchenko Y, Herbert JJ, Qiu C, Longo A, Beale AM. Identification of the key steps in the self-assembly of homogeneous gold metal nanoparticles produced using inverse micelles. Phys Chem Chem Phys 2019; 22:18824-18834. [PMID: 31475258 DOI: 10.1039/c9cp03473k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The self-assembly of gold nanoparticles (Au NPs) using polymer-encapsulated inverse micelles was studied using a set of advanced X-ray techniques (i.e. XAFS, SAXS) in addition to DLS, UV-vis spectroscopy and TEM. Importantly the combination of these techniques with the inverse micelle approach affords us detailed insight and to rationalize the evolving molecular chemistry and how this drives the formation of the Au NPs. We observe that the mechanism comprises three key steps: an initial fast reduction of molecular Au(iii) species to molecular Au(i)Cl; the latter species are often very unstable during the self-assembly process. This is followed by a gradual reduction of these molecular Au(i) species and the formation of sub-nanometric Au clusters which coalesce into nanoparticles. It was also found that addition of small amounts of HCl can accelerate the formation of the Au clusters (the second phase) without affecting the final particle size or its particle size distribution. These findings would help us to understand the reaction mechanism of Au NP formation as well as providing insights into how NP properties could be further tailored for a wide range of practical applications.
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Affiliation(s)
- Donato Decarolis
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK.
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16
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Nanoparticle Behaviour in Complex Media: Methods for Characterizing Physicochemical Properties, Evaluating Protein Corona Formation, and Implications for Biological Studies. BIOLOGICAL RESPONSES TO NANOSCALE PARTICLES 2019. [DOI: 10.1007/978-3-030-12461-8_5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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17
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Recovery of gold(III) from the stripping solution containing palladium(II) by ion exchange and synthesis of gold particles. J IND ENG CHEM 2019. [DOI: 10.1016/j.jiec.2018.09.038] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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18
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Monti S, Jose J, Sahajan A, Kalarikkal N, Thomas S. Structure and dynamics of gold nanoparticles decorated with chitosan–gentamicin conjugates: ReaxFF molecular dynamics simulations to disclose drug delivery. Phys Chem Chem Phys 2019; 21:13099-13108. [DOI: 10.1039/c9cp02357g] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Functionalized gold nanoparticles for antibiotic drug delivery: from the nanoscale to the atomic scale.
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Affiliation(s)
- Susanna Monti
- CNR-ICCOM
- Institute of Chemistry of Organometallic Compounds
- I-56124 Pisa
- Italy
| | - Jiya Jose
- International and Inter University Centre for Nanoscience and Nanotechnology
- Mahatma Gandhi University
- Kottayam-686 560
- India
| | - Athira Sahajan
- International and Inter University Centre for Nanoscience and Nanotechnology
- Mahatma Gandhi University
- Kottayam-686 560
- India
| | - Nandakumar Kalarikkal
- International and Inter University Centre for Nanoscience and Nanotechnology
- Mahatma Gandhi University
- Kottayam-686 560
- India
| | - Sabu Thomas
- International and Inter University Centre for Nanoscience and Nanotechnology
- Mahatma Gandhi University
- Kottayam-686 560
- India
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19
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Urbanski A, Hansch M, Lopez CG, Schweins R, Hertle Y, Hellweg T, Polzer F, Huber K. Polyacrylates in the presence of an extraordinary monovalent cation—Solution behavior and metal nanoparticle formation. J Chem Phys 2018; 149:163318. [DOI: 10.1063/1.5028182] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Anna Urbanski
- Physikalische Chemie, Universität Paderborn, 33098 Paderborn, Germany
| | - Markus Hansch
- Physikalische Chemie, Universität Paderborn, 33098 Paderborn, Germany
| | - Carlos G. Lopez
- Physikalische Chemie, Universität Paderborn, 33098 Paderborn, Germany
| | - Ralf Schweins
- Institut Laue-Langevin, DS/LSS, 71 Avenue des Martyrs, CS 20 156, F-38042 Grenoble Cedex 9, France
| | - Yvonne Hertle
- Physikalische und Biophysikalische Chemie, Universität Bielefeld, 33615 Bielefeld, Germany
| | - Thomas Hellweg
- Physikalische und Biophysikalische Chemie, Universität Bielefeld, 33615 Bielefeld, Germany
| | - Frank Polzer
- Department of Physics, Humboldt-Universität zu Berlin, 10099 Berlin, Germany
| | - Klaus Huber
- Physikalische Chemie, Universität Paderborn, 33098 Paderborn, Germany
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20
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In-Situ Deposition of Plasmonic Gold Nanotriangles and Nanoprisms onto Layered Hydroxides for Full-Range Photocatalytic Response towards the Selective Reduction of p-Nitrophenol. Catalysts 2018. [DOI: 10.3390/catal8090354] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
In this work, we present photocatalysis as a greener alternative to conventional catalysis where harsh reaction conditions, temperature and/or pressure are needed. Photodegradation of organic pollutants is a cost-effective, eco-friendly solution for the decontamination of water and air, and is a field that has been continuously growing over the last decade. Plasmonic metal nanoparticles absorb light irradiation that is transferred to the chemical reaction in a different fashion. Furthermore, plasmonic nanostructures can be combined with other materials, such as semiconductors or a basic support, to create hybrid systems capable of overcoming certain challenges that photocatalysis is facing nowadays and to expand the photocatalytic response towards the whole visible-near infrared (Vis-NIR) ranges. The main objective of this work has been to in-situ synthesize plasmonic anisotropic gold nanoparticles onto hydrotalcite (HT) and calcined hydrotalcite (CHT) supports by way of a sequential deposition-reduction (DR) process and to evaluate their efficiency as heterogeneous catalysts towards the selective oxidation of p-nitrophenol (hereafter 4-NP), a well-known model contaminant, either in the absence or the presence of full-range light irradiation sources (LEDs) spanning the whole UV-Vis-NIR range. Special attention has been paid to the optimization of the catalyst preparation parameters, including the pH and the concentration of reducing and stabilizing agents. Interestingly, the use of thermally modified hydrotalcites has enabled a strong metal-support interaction to induce the preferential formation of triangular-shaped Au nanoparticles with ca. 0.8 wt.% loading while increasing the colloidal stability and surface area of the catalyst with respect to the commercial untreated HT supports.
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21
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Boonying P, Martwiset S, Amnuaypanich S. Highly catalytic activity of nickel nanoparticles generated in poly(methylmethacrylate)@poly(2-hydroxyethylmethacrylate) (PMMA@PHEMA) core–shell micelles for the reduction of 4-nitrophenol (4-NP). APPLIED NANOSCIENCE 2018. [DOI: 10.1007/s13204-018-0669-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Zhang B, Fang J, Li J, Lau JJ, Mattia D, Zhong Z, Xie J, Yan N. Soft, Oxidative Stripping of Alkyl Thiolate Ligands from Hydroxyapatite-Supported Gold Nanoclusters for Oxidation Reactions. Chem Asian J 2015; 11:532-9. [DOI: 10.1002/asia.201501074] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 11/09/2015] [Indexed: 12/27/2022]
Affiliation(s)
- Bin Zhang
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
| | - Jun Fang
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
- State Key Laboratory of Materials-Oriented Chemical Engineering; Nanjing Tech University; No. 5 Xin Mofan Road Nanjing 210009 P. R. China
| | - Jingguo Li
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
| | - Jun Jie Lau
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
| | - Davide Mattia
- Department of Chemical Engineering; University of Bath; Claverton Down Bath BA2 7AY UK
| | - Ziyi Zhong
- Institute of Chemical and Engineering Sciences; ASTAR; 1 Pesek Road Jurong Island 627833 Singapore
| | - Jianping Xie
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
| | - Ning Yan
- Department of Chemical and Biomolecular Engineering; National University of Singapore; 4 Engineering Drive Singapore 117585 Singapore
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23
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Huo X, Dai C, Tian D, Li S, Li X. Au@SiO 2 core–shell structure involved with methotrexate: Fabrication, biodegradation process and bioassay explore. Int J Pharm 2015; 496:965-75. [DOI: 10.1016/j.ijpharm.2015.10.052] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 10/09/2015] [Accepted: 10/19/2015] [Indexed: 12/26/2022]
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24
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Peddi SP, Sadeh BA. Structural Studies of Silver Nanoparticles Obtained Through Single-Step Green Synthesis. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/1757-899x/92/1/012004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Zhu C, Du D, Eychmüller A, Lin Y. Engineering Ordered and Nonordered Porous Noble Metal Nanostructures: Synthesis, Assembly, and Their Applications in Electrochemistry. Chem Rev 2015; 115:8896-943. [DOI: 10.1021/acs.chemrev.5b00255] [Citation(s) in RCA: 502] [Impact Index Per Article: 55.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Chengzhou Zhu
- School
of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920, United States
| | - Dan Du
- School
of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920, United States
- Key
Laboratory of Pesticide and Chemical Biology of the Ministry of Education,
College of Chemistry, Central China Normal University, Wuhan 430079, P. R. China
| | | | - Yuehe Lin
- School
of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164-2920, United States
- Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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26
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Park JW, Shumaker-Parry JS. Strong resistance of citrate anions on metal nanoparticles to desorption under thiol functionalization. ACS NANO 2015; 9:1665-82. [PMID: 25625548 DOI: 10.1021/nn506379m] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Thiols are widely utilized to functionalize metal nanoparticles, including ubiquitous citrate-stabilized gold nanoparticles (AuNPs), for fundamental studies and biomedical applications. For more than two decades, citrate-to-thiol ligand exchange has been used to introduce functionality to AuNPs in the 5-100 nm size regime. Contrary to conventional assumptions about the completion of ligand exchange processes and formation of a uniform self-assembled monolayer (SAM) on the NP surface, coadsorption of thiols with preadsorbed citrates as a mixed layer on AuNPs is demonstrated. Hydrogen bonding between carboxyl moieties primarily is attributed to the strong adsorption of citrate, leading to the formation of a stabilized network that is challenging to displace. In these studies, adsorbed citrates, probed by Fourier transform infrared and X-ray photoelectron spectroscopy (XPS) analyses, remain on the surface following thiol addition to the AuNPs, whereas acetoacetate anions are desorbed. XPS quantitative analysis indicates that the surface density of alkyl and aryl thiolates for AuNPs with an average diameter of ∼40 nm is 50-65% of the value of a close-packed SAM on Au(111). We present a detailed citrate/thiolate coadsorption model that describes this final mixed surface composition. Intermolecular interactions between weakly coordinated oxyanions, such as polyprotic carboxylic acids, can lead to enhanced stability of the metal-ligand interactions, and this needs to be considered in the surface modification of metal nanoparticles by thiols or other anchor groups.
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Affiliation(s)
- Jong-Won Park
- Department of Chemistry, University of Utah , 1400 East 315 South, RM 2020, Salt Lake City, Utah 84112, United States
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27
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Facile Synthesis of Intelligent Polymers Modified Gold Nanoparticles in Aqueous Solution. J Inorg Organomet Polym Mater 2014. [DOI: 10.1007/s10904-014-0146-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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28
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Cardoso VS, Quelemes PV, Amorin A, Primo FL, Gobo GG, Tedesco AC, Mafud AC, Mascarenhas YP, Corrêa JR, Kuckelhaus SAS, Eiras C, Leite JRSA, Silva D, dos Santos Júnior JR. Collagen-based silver nanoparticles for biological applications: synthesis and characterization. J Nanobiotechnology 2014; 12:36. [PMID: 25223611 PMCID: PMC4428528 DOI: 10.1186/s12951-014-0036-6] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 09/04/2014] [Indexed: 12/30/2022] Open
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29
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de Oliveira JFA, Cardoso MB. Partial aggregation of silver nanoparticles induced by capping and reducing agents competition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:4879-4886. [PMID: 24328925 DOI: 10.1021/la403635c] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
It is well known that nanomaterials properties and applications are dependent on the size, shape, and morphology of these structures. Among nanomaterials, silver nanoparticles (AgNPs) have attracted attention since they have considerably versatile properties, such as a variable surface area to volume ratio, which is very useful for many biomedical and technological applications. Within this scenario, small nanoparticle aggregates can have their properties reduced due to the increased size and alterations in their shape/morphology. In this work, silver nanoparticles aggregation was studied through chemical reduction of silver nitrate in the presence of sodium borohydride (reducing agent) and sodium citrate (capping agent). By changing the amount of reducing agent along the reaction, unaggregated and partially aggregated samples were obtained and characterized by UV-vis, zeta potential, and SAXS techniques. pH was measured in every step of the reaction in order to correlate these results with those obtained from structural techniques. Addition of the reducing agent first causes the reduction of Ag(+) to silver nanoparticles. For higher concentrations of sodium borohydrate, the average AgNPs size is increased and NPs aggregation is observed. It was found that zeta potential and pH values have a strong influence on AgNPs formation, since reducing agent addition can induce partial removal of citrate weakly associated on the AgNPs surface and increase the ionic strength of the solution, promoting partial aggregation of the particles. This aggregation state was duly identified by coupling SAXS, zeta potential and pH measurements. In addition, the SAXS technique showed that aggregates formed along the process are elongated-like particles due to the exponential decay evidenced through SAXS curves.
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30
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Zhang Z, Li H, Zhang F, Wu Y, Guo Z, Zhou L, Li J. Investigation of halide-induced aggregation of Au nanoparticles into spongelike gold. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2648-59. [PMID: 24552456 DOI: 10.1021/la4046447] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
We present a facile method for fabricating spongelike Au structures by halide-induced aggregation and fusion of gold nanoparticles (AuNPs). Halide ions (F(-), Cl(-), Br(-), and I(-)) showed distinctly different effects on the synthesized AuNPs, which were characterized by localized surface plasmon resonance (LSPR) and dynamic light scattering measurements. A noticeable red-shift in the LSPR peak was found after Br(-) and I(-) ion treatment, which indicates the adsorption of halide atoms or ions on the AuNPs. The surface potential of AuNPs varied by treatment with different types of halides; this finding indicates that different halide ions have different effects on the AuNPs. Br(-) and I(-) ions showed strong affinity toward the AuNPs. The different affinities of halide ions toward the AuNPs play an important role in controlling the formation process of spongelike gold. Citrate ions adsorbed on AuNPs were displaced by halide ions to different extents. Such displacement determined the aggregation and fusion behaviors of the AuNPs and eventually the formation of different spongelike structures.
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Affiliation(s)
- Zhiqiang Zhang
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences , Suzhou 215163, PR China
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31
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Rastegarzadeh S, Barkat Rezaei Z. Environmental assessment of 2-mercaptobenzimidazole based on the surface plasmon resonance band of gold nanoparticles. ENVIRONMENTAL MONITORING AND ASSESSMENT 2013; 185:9037-9042. [PMID: 23657736 DOI: 10.1007/s10661-013-3233-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Accepted: 04/25/2013] [Indexed: 06/02/2023]
Abstract
A colorimetric assay method is described for the environmental detection of 2-mercaptobenzimidazole (MBI) using surface plasmon resonance of gold nanoparticles (AuNPs). Stable and dispersed AuNPs with intensified plasmon resonance were prepared in situ using a simple, rapid, and eco-friendly procedure by applying ascorbic acid as a reducer and cetyltrimethylammonium bromide as a stabilizer. The presence of MBI has a strong effect on the plasmon absorbance of AuNPs, which was employed for the detection of MBI. The calibration curve was linear in the range of 1.0 × 10(-6)-5.5 × 10(-5) mol/L of MBI; the detection limit was 8.4 × 10(-7) mol/L. The relative standard deviations for eight replicate measurements of 3.0 × 10(-6) and 5 × 10(-5) mol/L MBI were 3.9 and 1.4%, respectively. The method was successfully applied to the determination of MBI in tap, river, sea, and heat exchanger cooling water samples.
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Affiliation(s)
- Saadat Rastegarzadeh
- Department of Chemistry, College of Science, Shahid Chamran University, Ahvaz, 6135743135, Iran,
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32
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Jiang C, Zhao T, Yuan P, Gao N, Pan Y, Guan Z, Zhou N, Xu QH. Two-photon induced photoluminescence and singlet oxygen generation from aggregated gold nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2013; 5:4972-7. [PMID: 23688198 DOI: 10.1021/am4007403] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Metal nanoparticles have potential applications as bioimaging and photosensitizing agents. Aggregation effects are generally believed to be adverse to their biomedical applications. Here we have studied the aggregation effects on two-photon induced photoluminescence and singlet oxygen generation of Au nanospheres and Au nanorods of two different aspect ratios. Aggregated Au nanospheres and short Au nanorods were found to display enhanced two-photon induced photoluminescence and singlet oxygen generation capabilities compared to the unaggregated ones. The two-photon photoluminescence of Au nanospheres and short Au nanorods were enhanced by up to 15.0- and 2.0-fold upon aggregation, and the corresponding two-photon induced singlet oxygen generation capabilities were enhanced by 8.3 and 1.8-fold, respectively. The two-photon induced photoluminescence and singlet oxygen generation of the aggregated long Au nanorods were found to be lower than the unaggregated ones. These results support that the change in their two-photon induced photoluminescence and singlet oxygen generation originate from aggregation modulated two-photon excitation efficiency. This finding is expected to foster more biomedical applications of metal nanoparticles as Au nanoparticles normally exist in an aggregated form in the biological environments. Considering their excellent biocompatibility, high inertness, ready conjugation, and easy preparation, Au nanoparticles are expected to find more applications in two-photon imaging and two-photon photodynamic therapy.
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Affiliation(s)
- Cuifeng Jiang
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore
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33
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Zalesskiy SS, Sedykh AE, Kashin AS, Ananikov VP. Efficient general procedure to access a diversity of gold(0) particles and gold(I) phosphine complexes from a simple HAuCl4 source. Localization of homogeneous/heterogeneous system's interface and field-emission scanning electron microscopy study. J Am Chem Soc 2013; 135:3550-9. [PMID: 23276227 DOI: 10.1021/ja311258e] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Soluble gold precatalysts, aimed for homogeneous catalysis, under certain conditions may form nanoparticles, which dramatically change the mechanism and initiate different chemistry. The present study addresses the question of designing gold catalysts, taking into account possible interconversions and contamination at the homogeneous/heterogeneous system's interface. It was revealed that accurate localization of boundary experimental conditions for formation of molecular gold complexes in solution versus nucleation and growth of gold particles opens new opportunities for well-known gold chemistry. Within the developed concept, a series of practical procedures was created for efficient synthesis of soluble gold complexes with various phosphine ligands (R3P)AuCl (90-99% yield) and for preparation of different types of gold materials. The effect of the ligand on the particles growth in solution has been observed and characterized with high-resolution field-emission scanning electron microscopy (FE-SEM) study. Two unique types of nanostructured gold materials were prepared: hierarchical agglomerates and gold mirror composed of ultrafine smoothly shaped particles.
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Affiliation(s)
- Sergey S Zalesskiy
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow 119991, Russia
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34
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Jiang W, Hibbert DB, Moran G, Herrmann J, Jämting ÅK, Coleman VA. Characterisation of gold agglomerates: size distribution, shape and optical properties. RSC Adv 2013. [DOI: 10.1039/c3ra22727h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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35
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High-purity gold nanobipyramids can be obtained by an electrolyte-assisted and functionalization-free separation route. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.07.034] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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36
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Wojtysiak S, Kudelski A. Influence of oxygen on the process of formation of silver nanoparticles during citrate/borohydride synthesis of silver sols. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.06.012] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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37
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Visual and colorimetric detection of mercury(II) ion using gold nanoparticles stabilized with a dithia-diaza ligand. Mikrochim Acta 2011. [DOI: 10.1007/s00604-011-0691-3] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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38
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Zhang Z, Wu Y. NaBH4-induced assembly of immobilized Au nanoparticles into chainlike structures on a chemically modified glass surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:9834-9842. [PMID: 21728373 DOI: 10.1021/la201943u] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A facile method of obtaining chainlike assemblies of gold nanoparticles (AuNPs) on a chemically modified glass surface based on NaBH(4) treatment is developed. Citrate-stabilized AuNPs (17 nm) are immobilized on a glutaraldehyde-functionalized glass surface and assembled into chainlike structures after treatment with aqueous sodium borohydride (NaBH(4)) solution. The production and morphology of the AuNP chainlike assemblies are controlled by the density of the immobilized NPs, the concentration of NaBH(4) solution, and the treatment time. The AuNP assemblies are stable in water and can undergo drying. X-ray photoelectron spectroscopic data show that the number of citrate ions on the AuNPs decreased by 43% after treatment with 5 mg/mL NaBH(4) solution. The NaBH(4)-induced partial removal of the citrate ions and the roughness of the glass surface greatly affect the binding force of AuNPs on the substrate. The immobilized AuNPs begin to move at the solid-liquid interface without desorbing when the strength of the binding force was decreased. These mobile NPs form chainlike assemblies under the driving force of van der Waals interaction and diffusion. This interface-based formation of chainlike assemblies of AuNPs may provide a simple protocol for the 1D assembly of other Au-coated colloidal nanoparticles.
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Affiliation(s)
- Zhiqiang Zhang
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, PR China
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39
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Zhang YR, Xu YZ, Xia Y, Huang W, Liu FA, Yang YC, Li ZL. A novel strategy to assemble colloidal gold nanoparticles at the water–air interface by the vapor of formic acid. J Colloid Interface Sci 2011; 359:536-41. [DOI: 10.1016/j.jcis.2011.04.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2011] [Revised: 03/26/2011] [Accepted: 04/07/2011] [Indexed: 10/18/2022]
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40
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Yang P, Ando M, Murase N. Various Au nanoparticle organizations fabricated through SiO2 monomer induced self-assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:895-901. [PMID: 21188967 DOI: 10.1021/la103143j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A novel method has been developed to fabricate the assembly of Au colloidal nanoparticles (NPs) using SiO(2) monomers. The key strategy was the use of a controlled sol-gel procedure including hydrolysis, deposition, and condensation of tetraethyl orthosilicate (TEOS). Namely, the assembly of Au NPs was created by the anisotropic deposition of SiO(2) monomers and subsequent permanent fixing by the growth of a SiO(2) shell. Various assemblies of Au NPs such as dimer, trimer, and pearl-chain morphology were fabricated by systematically changing the concentration and injection speed of TEOS. A longitudinal plasmon resonance band was observed as a result of the assembly of Au NPs and can be tuned from visible to near-infrared by altering the length of pearl-chain morphology. In addition, single Au NP was homogeneously coated with a SiO(2) shell by means of controlling the deposition rate of SiO(2) monomers during a Stöber synthesis without the use of a silane coupling agent or bulk polymer as the surface primer to render the Au surface vitreophilic. The Au NPs (mean size 11.4 nm in diameter) were thus encapsulated into SiO(2) beads with a wide range of sizes (from 20 to 50 nm in diameter). These pure SiO(2)-coated Au beads with tunable shell thickness should be crucial for biosensors, particularly as Raman-tag particles.
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Affiliation(s)
- Ping Yang
- National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda-city, Osaka 563-8577, Japan
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