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Jiang L, Mao X, Liu C, Guo X, Deng R, Zhu J. 2D superlattices via interfacial self-assembly of polymer-grafted Au nanoparticles. Chem Commun (Camb) 2023; 59:14223-14235. [PMID: 37962523 DOI: 10.1039/d3cc04587k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Nanoparticle (NP) superlattices are periodic arrays of nanoscale building blocks. Because of the collective effect between functional NPs, NP superlattices can exhibit exciting new properties that are distinct from those of individual NPs or corresponding bulk materials. In particular, two-dimensional (2D) NP superlattices have attracted increasing attention due to their emerging applications in micro/opto-electronics, catalysis, sensing, and other fields. Among various preparation methods, evaporation-induced interfacial self-assembly has become the most popular method for preparing 2D NP superlattices because it is a simple, low-cost, and scalable process that can be widely applied to various NPs. Introducing soft ligands, such as polymers, can not only provide convenience in controlling the self-assembly process and tuning superlattice structures but also improve the properties of 2D NP superlattices. This feature article focuses on the methods of evaporation-induced self-assembly of polymer-grafted Au NPs into free-standing 2D NP superlattice films at air/liquid interfaces and 2D NP superlattice coatings on substrates, followed by studies on in situ tracking of the self-assembly evolution process through small-angle X-ray scattering. Their application in nano-floating gate memory devices is also included. Finally, the challenges and perspectives of this direction are discussed.
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Affiliation(s)
- Liangzhu Jiang
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Xi Mao
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Changxu Liu
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Xiaodan Guo
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Renhua Deng
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
| | - Jintao Zhu
- Key Laboratory of Materials Chemistry for Energy Conversion and Storage of the Ministry of Education School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
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2
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Moshrefi R, Ryan K, Connors EP, Walsh JC, Merschrod E, Bodwell GJ, Stockmann TJ. Electrosynthesis of Au nanocluster embedded conductive polymer films at soft interfaces using dithiafulvenyl-functionalized pyrene. NANOSCALE 2023; 15:5834-5842. [PMID: 36861258 DOI: 10.1039/d2nr06519c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Nanoparticle (NP) embedded conductive polymer films are desirable platforms for electrocatalysis as well as biomedical and analytical applications. Increased catalytic and analytical performance is accompanied by concomitant decreases in NP size. Herein, highly reproducible electrogeneration of low dispersity Au nanocluster embedded ultra-thin (∼2 nm) conductive polymer films at a micro liquid|liquid interface is demonstrated. Confinement at a micropipette tip facilitates a heterogeneous electron transfer process across the interface between two immiscible electrolyte solutions (ITIES), between KAuCl4(aq) and a dithiafulvenyl-substituted pyrene monomer, 4,5-didecoxy-1,8-bis(dithiafulven-6-yl)pyrene (bis(DTF)pyrene), in oil, i.e., a w|o interface. At a large ITIES the reaction is spontaneous, rapid, and proceeds via transfer of AuCl4- to the oil phase, followed by homogeneous electron transfer generating uncontrolled polymer growth with larger (∼50 nm) Au nanoparticles (NPs). Thus, miniaturization facilitates external, potential control and limits the reaction pathway. Atomic (AFM) and Kelvin probe force microscopies (KPFM) imaged the topography and work function distribution of the as-prepared films. The latter was linked to nanocluster distribution.
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Affiliation(s)
- Reza Moshrefi
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Katelyn Ryan
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Evan P Connors
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Joshua C Walsh
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Erika Merschrod
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Graham J Bodwell
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
| | - Talia Jane Stockmann
- Memorial University of Newfoundland, Core Science Facility, 45 Arctic Ave, St. John's, NL, Canada, A1C 5S7.
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3
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Suárez-Herrera MF, Gamero-Quijano A, Scanlon MD. Electrosynthesis of poly(2,5-dimercapto-1,3,4-thiadiazole) films and their composites with gold nanoparticles at a polarised liquid|liquid interface. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.140677] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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4
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Zhou B, Qu C, Du S, Gao W, Zhang Y, Ding Y, Wang H, Hou R, Su M, Liu H. Multi-analyte High-Throughput Microplate-SERS Reader with Controllable Liquid Interfacial Arrays. Anal Chem 2022; 94:7528-7535. [PMID: 35581026 DOI: 10.1021/acs.analchem.2c00252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High-throughput surface-enhanced Raman scattering (SERS) reader, especially for liquid sample testing, is of great significance and huge demand in biology, environment, and other analytical fields. Inspired by the principle of microplate reader, herein, we developed a microplate-SERS reader for semiautomatic and high-throughput assays by virtue of three-dimensional liquid interfacial arrays (LIAs). For the first time, the formation of LIA in oil-in-water state, water-in-oil state, and two-dimensional plane state is realized by operating the hydrophilicity (contact angle) of the container. Through the force analysis of LIA, the effect of organic (O) phase density on the relative position of LIA was quantified. In addition, the optimized reader offers fast and continuous semiautomatic detection of 12 samples below 10 min with great signal reproducibility (calibration with the characteristic peak of O phase as the internal standard). The isolated wells in the microplate prevent analyte cross talk, allowing accurate quantification of each sample. Multiplex analysis capability highlights that this reader has the ability of rapid identification and quantification of samples containing various analytes and concentrations. The results demonstrate high-resolution dual and triple analyte detection with fully preserved signal and Raman features of individual analytes in a mixture, which implies that it also has excellent anticounterfeiting applications. This microplate-SERS reader combines the superior advantages of the LIA, microplate, and SERS techniques to retrieve the molecular vibrational fingerprints of various chemicals in complex media.
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Affiliation(s)
- Baomei Zhou
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Cheng Qu
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Shanshan Du
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Wanjun Gao
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, 130 Changjiang West Road, Hefei, Anhui 230036, China
| | - Yu Zhang
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Yan Ding
- Department of Radiation Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, China
| | - Hongyan Wang
- Department of Radiation Oncology, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230022, China
| | - Ruyan Hou
- State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, 130 Changjiang West Road, Hefei, Anhui 230036, China
| | - Mengke Su
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China.,State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, 130 Changjiang West Road, Hefei, Anhui 230036, China
| | - Honglin Liu
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
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Zhu Y, Liu W, Liu S, Li M, Zhao L, Xu L, Wang N, Zhao G, Yu Q. Preparation of AgNPs self-assembled solid-phase substrate via seed-mediated growth for rapid identification of different bacterial spores based on SERS. Food Res Int 2022; 160:111426. [DOI: 10.1016/j.foodres.2022.111426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Revised: 05/23/2022] [Accepted: 05/24/2022] [Indexed: 11/04/2022]
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6
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Tian T, Yi J, Liu Y, Li B, Liu Y, Qiao L, Zhang K, Liu B. Self-assembled plasmonic nanoarrays for enhanced bacterial identification and discrimination. Biosens Bioelectron 2022; 197:113778. [PMID: 34798500 DOI: 10.1016/j.bios.2021.113778] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 11/02/2021] [Accepted: 11/08/2021] [Indexed: 12/12/2022]
Abstract
The rapid and accurate bacterial testing is a critical step for the management of infectious diseases, but challenges remain largely due to a lack of advanced sensing tools. Here we report the development of highly plasmon-active, biofunctional nanoparticle arrays for simultaneous capture, identification, and differentiation of bacteria by surface-enhanced Raman scattering (SERS). The nanoarrays were facilely prepared through an electrostatic mechanism-controlled self-assembly of metallic nanoparticles at liquid-liquid interfaces, and exhibited high SERS sensitivity beyond femtomole, good reproducibility (relative standard deviation of 2.7%) and stability. Modification of the nanoarrays with concanavalin A allowed to effective capture of both Gram-positive and Gram-negative bacteria (bacterial-capture efficiency maintained beyond 50%) at bacterial concentrations ranging from 50 to 2000 CFU mL-1, as determined by the plate-counting method. Moreover, single-cell Raman fingerprinting and discrimination of eight different bacteria species with high signal-to-noise ratio, excellent spectral reproducibility, and a total assay time of 1.5 h was achieved under fairly mild conditions (24 μW, acquisition time: 1 s). Collectively, we believe that our biofunctionalized, SERS-based self-assembled nanoarrays have great potential to help in rapid and label-free bacterial diagnosis and phenotyping study.
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Affiliation(s)
- Tongtong Tian
- Department of Chemistry, Shanghai Stomatological Hospital, State Key Laboratory of Molecular Engineering of Polymers and Institute of Biomedical Sciences, Fudan University, Shanghai, 200433, China
| | - Jia Yi
- Department of Chemistry, Shanghai Stomatological Hospital, State Key Laboratory of Molecular Engineering of Polymers and Institute of Biomedical Sciences, Fudan University, Shanghai, 200433, China
| | - Yujie Liu
- Shanghai Institute for Pediatric Research, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, China
| | - Binxiao Li
- Department of Chemistry, Shanghai Stomatological Hospital, State Key Laboratory of Molecular Engineering of Polymers and Institute of Biomedical Sciences, Fudan University, Shanghai, 200433, China
| | - Yixin Liu
- Department of Chemistry, Shanghai Stomatological Hospital, State Key Laboratory of Molecular Engineering of Polymers and Institute of Biomedical Sciences, Fudan University, Shanghai, 200433, China
| | - Liang Qiao
- Department of Chemistry, Shanghai Stomatological Hospital, State Key Laboratory of Molecular Engineering of Polymers and Institute of Biomedical Sciences, Fudan University, Shanghai, 200433, China
| | - Kun Zhang
- Shanghai Institute for Pediatric Research, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, China.
| | - Baohong Liu
- Shanghai Institute for Pediatric Research, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, 200092, China.
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Vialetto J, Anyfantakis M. Exploiting Additives for Directing the Adsorption and Organization of Colloid Particles at Fluid Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:9302-9335. [PMID: 34327999 DOI: 10.1021/acs.langmuir.1c01029] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The self-assembly of colloids at fluid interfaces is a well-studied research field both for gaining fundamental insights and for material fabrication. The fluid interface allows the confinement of particles in two dimensions and may act as a template for guiding their organization into soft and reconfigurable structures. Additives (e.g., surfactants, salts, and polymers) in the colloidal suspension are routinely used as a practical and effective tool to drive particle adsorption and tune their interfacial organization. However, some phenomena lying at the heart of the accumulation and self-assembly of particles at fluid interfaces remain poorly understood. This Feature Article aims to critically analyze the mechanisms involved in the adsorption and self-organization of micro- and nanoparticles at various fluid interfaces. In particular, we address the role of additives in both promoting the adsorption of particles from the bulk suspension to the fluid interface and in mediating the interactions between interfacial particles. We emphasize how different types of additives play a crucial role in controlling the interactions between suspended particles and the fluid interface as well as the interactions between adsorbed particles, thus dictating the final self-assembled structure. We also critically summarize the main experimental protocols developed for the complete adsorption of particles initially suspended in the bulk. Furthermore, we highlight some special properties (e.g., reconfigurability upon external stimulation and dissipative self-assembly) and the application potential of structures formed by colloid self-organization at fluid interfaces mediated/promoted by additives. We believe our contribution serves both as a practical roadmap to scientists coming from other fields and as a valuable information resource for all researchers interested in this exciting research field.
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Affiliation(s)
- Jacopo Vialetto
- Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zürich, Zürich, Switzerland
| | - Manos Anyfantakis
- Department of Physics and Materials Science, University of Luxembourg, Luxembourg L-1511, Luxembourg
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8
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Zhang Z, Kneipp J. Ligand-Supported Hot Electron Harvesting: Revisiting the pH-Responsive Surface-Enhanced Raman Scattering Spectrum of p-Aminothiophenol. J Phys Chem Lett 2021; 12:1542-1547. [PMID: 33534593 DOI: 10.1021/acs.jpclett.0c03732] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The discussion of the surface-enhanced Raman scattering (SERS) spectra of p-aminothiophenol (PATP) and of its photocatalytic reaction product 4,4'-dimercaptoazobenzene (DMAB) is important for understanding plasmon-supported spectroscopy and catalysis. Here, SERS spectra indicate that DMAB forms also in a nonphotocatalytic reaction on silver nanoparticles. Spectra measured at low pH, in the presence of the acids HCl, H2SO4, HNO3, and H3PO4, show that DMAB is reduced to PATP when both protons and chloride ions are present. Moreover, the successful reduction of DMAB in the presence of other, halide and nonhalide, ligands suggests a central role of these species in the reduction. As discussed, the ligands increase the efficiency of hot-electron harvesting. The pH-associated reversibility of the SERS spectrum of PATP is established as an observation of the DMAB dimer at high pH and of PATP as a product of its hot-electron reduction at low pH, in the presence of the appropriate ligand.
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Affiliation(s)
- Zhiyang Zhang
- Department of Chemistry and School of Analytical Sciences Adlershof (SALSA), Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Straße 11, 12489 Berlin, Germany
| | - Janina Kneipp
- Department of Chemistry and School of Analytical Sciences Adlershof (SALSA), Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, 12489 Berlin, Germany
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Straße 11, 12489 Berlin, Germany
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9
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Bebon R, Majee A. Electrostatic pair-interaction of nearby metal or metal-coated colloids at fluid interfaces. J Chem Phys 2020; 153:044903. [PMID: 32752694 DOI: 10.1063/5.0013298] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
In this paper, we theoretically study the electrostatic interaction between a pair of identical colloids with constant surface potentials sitting in close vicinity next to each other at the fluid interface. By employing a simplified yet reasonable model system, the problem is solved within the framework of classical density functional theory and linearized as well as nonlinear Poisson-Boltzmann (PB) theory. Apart from providing a sound theoretical framework generally applicable to any such problem, our novel findings, all of which contradict common beliefs, include the following: first, quantitative and qualitative differences between the interactions obtained within the linear and the nonlinear PB theories; second, the importance of the electrostatic interaction between the omnipresent three-phase contact lines in interfacial systems; and, third, the occurrence of an attractive electrostatic interaction between a pair of identical metal colloids. The unusual attraction we report largely stems from an attractive line interaction, which although scales linearly with the size of the particle can compete with the surface interactions and can be strong enough to alter the nature of the total electrostatic interaction. Our results should find applications in metal or metal-coated particle-stabilized emulsions where densely packed particle arrays are not only frequently observed but also sometimes required.
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Affiliation(s)
- Rick Bebon
- Max Planck Institute for Intelligent Systems, Stuttgart, Germany and IV. Institute for Theoretical Physics, University of Stuttgart, Stuttgart, Germany
| | - Arghya Majee
- Max Planck Institute for Intelligent Systems, Stuttgart, Germany and IV. Institute for Theoretical Physics, University of Stuttgart, Stuttgart, Germany
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10
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Sachdev S, Maugi R, Davis S, Doak SS, Zhou Z, Platt M. Droplet factories: Synthesis and assembly of metal nanoparticles on magnetic supports. J Colloid Interface Sci 2020; 569:204-210. [PMID: 32113017 DOI: 10.1016/j.jcis.2020.02.087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 02/17/2020] [Accepted: 02/20/2020] [Indexed: 10/25/2022]
Abstract
The interface between two immiscible liquids represent an ideal substrate for the assembly of nanomaterials. The defect free surface provides a reproducible support for creating densely packed ordered materials. Here a droplet flow reactor is presented for the synthesis and/or assembly of nanomaterials at the interface of the emulsion. Each droplet acts as a microreactor for a reaction between decamethylferrocene (DmFc) within the hexane and metal salts (Ag+/Pd2+) in the aqueous phase. The hypothesis was that a spontaneous, interfacial reaction would lead to the assembly of nanomaterials creating a Pickering emulsion. The subsequent removal of the solvents showed how the Ag nanoparticles remain trapped at the interface and retain the shape of the droplet, however the Pd nanoparticles were dispersed with no tertiary structure. To further exploit this, a one-step process where the particles are synthesised and then assembled into core-shell materials was proposed. The same reactions were performed in the presence of oleic acid stabilised iron oxide nanoparticles dispersed within the hexane. It was shown that by changing the reaction rate and ratio between metal and iron oxide a continuous coating of metal nanoparticles can be formed on top of an iron oxide microsphere, or form a uniform composite. These insights offer a new method and chemistry within flow reactors for the creation of palladium and silver nanoparticles. We use the technique to create metal coated iron oxide nanomaterials but the methodology could be easily transferred to the assembly of other materials.
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Affiliation(s)
- Suchanuch Sachdev
- Department of Chemistry, Loughborough University, Loughborough LE11 3TU, United Kingdom
| | - Rhushabh Maugi
- Department of Chemistry, Loughborough University, Loughborough LE11 3TU, United Kingdom
| | - Samuel Davis
- Loughborough Materials Characterisation Centre, Department of Materials, Loughborough University, Loughborough LE11 3TU, United Kingdom
| | - Scott S Doak
- Loughborough Materials Characterisation Centre, Department of Materials, Loughborough University, Loughborough LE11 3TU, United Kingdom
| | - Zhaoxia Zhou
- Loughborough Materials Characterisation Centre, Department of Materials, Loughborough University, Loughborough LE11 3TU, United Kingdom
| | - Mark Platt
- Department of Chemistry, Loughborough University, Loughborough LE11 3TU, United Kingdom.
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11
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Su M, Wang C, Wang T, Jiang Y, Xu Y, Liu H. Breaking the Affinity Limit with Dual-Phase-Accessible Hotspot for Ultrahigh Raman Scattering of Nonadsorptive Molecules. Anal Chem 2020; 92:6941-6948. [PMID: 32329602 DOI: 10.1021/acs.analchem.9b05727] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
For surface-enhanced Raman scattering (SERS) analysis, only analytes that can be absorbed spontaneously onto a noble metal surface can be detected effectively. Therefore, getting nonadsorptive molecules close enough to the surface has always been a key challenge in SERS analysis. Here absorbance measurements show that the liquid-interfacial array (LIA) does not adsorb or enrich benzopyrene (Bap) molecules, which lack effective functional groups that can interact with the noble metal surfaces. But the SERS intensity of 0.1 ppm Bap on the LIA is 10 times larger than that of 10 ppm Bap on traditional solid substrate, i.e., 3 orders of magnitude of enhancement. The LIA overcomes the restriction of affinity between Bap molecules and the metal surface, and the Bap molecules can easily enter nanogaps without steric hindrance. Furthermore, both adsorptive and nonadsorptive molecules were used to observe the SERS enhancement behavior on the LIA platforms. In multiple detection, competitive SERS signal changes could be observed between adsorptive and nonadsorptive molecules or between nonadsorptive and nonadsorptive molecules. A theoretical scheme was profiled for localized surface plasmon resonance (SPR) properties of the LIA. Finite difference-time domain (FDTD) simulation shows that the LIAs have biphasic and accessible asymmetric hotspots, and the electric field enhancement in the CHCl3 (O) phase is approximately four times larger than that of the water (W) phase. In addition, the position and relative strength of the electromagnetic field depend on the spatial position of gold nanoparticles (GNPs) relative to the liquid-liquid interface (LLI), i.e., when the GNP dimer is completely immersed in a certain phase, the electromagnetic field enhancement of the CHCl3 phase is approximately 7 times larger than that of the W phase. We speculate that dual-phase-accessible hotspots and the hydrophobic environment provided by CHCl3 are two important factors contributing to successful detection of four common polycyclic aromatic hydrocarbons (PAHs) with a detection limit of 10 ppb. Finally, the LIA platform successfully realizes simultaneous detection of multiple PAHs in both plant and animal oils with good stability. This study provides a new direction for the development of high-efficiency and practical SERS technology for nonadsorptive molecules.
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Affiliation(s)
- Mengke Su
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Chao Wang
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230029, China
| | - Tengfei Wang
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Yifan Jiang
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Yue Xu
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Honglin Liu
- School of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China.,Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Life Sciences, and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan 410082, China.,State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai 200050, China
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12
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Song L, Huang Y, Nie Z, Chen T. Macroscopic two-dimensional monolayer films of gold nanoparticles: fabrication strategies, surface engineering and functional applications. NANOSCALE 2020; 12:7433-7460. [PMID: 32219290 DOI: 10.1039/c9nr09420b] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
In the last few decades, two-dimensional monolayer films of gold nanoparticles (2D MFGS) have attracted increasing attention in various fields, due to their superior attributes of macroscopic size and accessible fabrication, controllable electromagnetic enhancement, distinctive optical harvesting and electron transport capabilities. This review will focus on the recent progress of 2D monolayer films of gold nanoparticles in construction approaches, surface engineering strategies and functional applications in the optical and electric fields. The research challenges and prospective directions of 2D MFGS are also discussed. This review would promote a better understanding of 2D MFGS and establish a necessary bridge among the multidisciplinary research fields.
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Affiliation(s)
- Liping Song
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
| | - Youju Huang
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China. and College of Materials, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, Zhejiang 311121, China and National Engineering Research Centre for Advanced Polymer Processing Technology, Key Laboratory of Materials Processing and Mold (Zhengzhou University), Ministry of Education, Zhengzhou University, Zhengzhou 450002, P. R. China
| | - Zhihong Nie
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, 200438, P. R. China.
| | - Tao Chen
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China.
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13
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Zhang Z, Li Y, Frisch J, Bär M, Rappich J, Kneipp J. In situ surface-enhanced Raman scattering shows ligand-enhanced hot electron harvesting on silver, gold, and copper nanoparticles. J Catal 2020. [DOI: 10.1016/j.jcat.2020.01.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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14
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Li S, Xu J, Wang S, Xia X, Chen L, Chen Z. Versatile metal graphitic nanocapsules for SERS bioanalysis. CHINESE CHEM LETT 2019. [DOI: 10.1016/j.cclet.2019.05.049] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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15
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Su M, Jiang Y, Yu F, Yu T, Du S, Xu Y, Yang L, Liu H. Mirrorlike Plasmonic Capsules for Online Microfluidic Raman Analysis of Drug in Human Saliva and Urine. ACS APPLIED BIO MATERIALS 2019; 2:3828-3835. [DOI: 10.1021/acsabm.9b00425] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Mengke Su
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Yifan Jiang
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Fanfan Yu
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Ting Yu
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Shanshan Du
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Yue Xu
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Lina Yang
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Honglin Liu
- School of Food and Biological Engineering, Engineering Research Center of Bio-Process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Life Sciences, and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan 410082, China
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai 200050, China
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16
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A polarization based study of gold nanoparticles entrapped in single-wall carbon nanotube doped nanoscaffold. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.03.043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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17
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Stark K, Hitchcock JP, Fiaz A, White AL, Baxter EA, Biggs S, McLaughlan JR, Freear S, Cayre OJ. Encapsulation of Emulsion Droplets with Metal Shells for Subsequent Remote, Triggered Release. ACS APPLIED MATERIALS & INTERFACES 2019; 11:12272-12282. [PMID: 30860810 DOI: 10.1021/acsami.9b00087] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A two-step method to encapsulate an oil core with an impermeable shell has been developed. A thin metallic shell is deposited on the surface of emulsion droplets stabilized by metal nanoparticles. This thin shell is shown to prevent diffusion of the oil from within the core of the metal-shell microcapsules when placed in a continuous phase that fully dissolves the oil. The stabilizing nanoparticles are sterically stabilized by poly(vinyl pyrrolidone) chains and are here used as a catalyst/nucleation site at the oil-water interface to grow a secondary metal shell on the emulsion droplets via an electroless deposition process. This method provides the simplest scalable route yet to synthesize impermeable microcapsules with the added benefit that the final structure allows for drastically improving the overall volume of the encapsulated core to, in this case, >99% of the total volume. This method also allows for very good control over the microcapsule properties, and here we demonstrate our ability to tailor the final microcapsule density, capsule diameter, and secondary metal film thickness. Importantly, we also demonstrate that such impermeable microcapsule metal shells can be remotely fractured using ultrasound-based devices that are commensurate with technologies currently used in medical applications, which demonstrate the possibility to adapt these microcapsules for the delivery of cytotoxic drugs.
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Affiliation(s)
| | | | | | - Alison L White
- Australian Institute for Bioengineering and Nanotechnology , University of Queensland , St Lucia , Queensland 4072 , Australia
| | - Elaine A Baxter
- Greater London Innovation Centre , Procter & Gamble , Egham , Surrey TW20 9NW , U.K
| | - Simon Biggs
- The University of Western Australia , Perth , WA 6009 , Australia
| | - James R McLaughlan
- Leeds Institute of Medical Research , University of Leeds, St. James's University Hospital , Leeds LS9 7TF , U.K
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18
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Su M, Li X, Zhang S, Yu F, Tian L, Jiang Y, Liu H. Self-Healing Plasmonic Metal Liquid as a Quantitative Surface-Enhanced Raman Scattering Analyzer in Two-Liquid-Phase Systems. Anal Chem 2019; 91:2288-2295. [DOI: 10.1021/acs.analchem.8b04893] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Mengke Su
- College of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Life Sciences, and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan 410082, China
| | - Xiaoyun Li
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China
| | - Shibin Zhang
- College of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Fanfan Yu
- College of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Li Tian
- College of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Yifan Jiang
- College of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
| | - Honglin Liu
- College of Food and Biological Engineering, Engineering Research Center of Bio-process, Ministry of Education, Hefei University of Technology, Hefei, Anhui 230009, China
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Life Sciences, and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan 410082, China
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19
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Xu Y, Yu F, Su M, Du S, Liu H. Halide-assisted activation of atomic hydrogen for photoreduction on two-liquid interfacial plasmonic arrays. Chem Commun (Camb) 2019; 55:1422-1425. [DOI: 10.1039/c8cc09619h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A two-liquid interfacial 3D plasmonic array for SERS examination on direct photoreduction of p-nitrothiophenol to p-aminothiophenol, revealing the mechanism of halide-assisted activation of atomic hydrogen and the balance between the enhancing and weakening effect.
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Affiliation(s)
- Yue Xu
- College of Food and Biological Engineering
- Engineering Research Center of Bio-process
- Ministry of Education
- Hefei University of Technology
- Hefei
| | - Fanfan Yu
- College of Food and Biological Engineering
- Engineering Research Center of Bio-process
- Ministry of Education
- Hefei University of Technology
- Hefei
| | - Mengke Su
- College of Food and Biological Engineering
- Engineering Research Center of Bio-process
- Ministry of Education
- Hefei University of Technology
- Hefei
| | - Shanshan Du
- College of Food and Biological Engineering
- Engineering Research Center of Bio-process
- Ministry of Education
- Hefei University of Technology
- Hefei
| | - Honglin Liu
- College of Food and Biological Engineering
- Engineering Research Center of Bio-process
- Ministry of Education
- Hefei University of Technology
- Hefei
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20
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Tian L, Su M, Yu F, Xu Y, Li X, Li L, Liu H, Tan W. Liquid-state quantitative SERS analyzer on self-ordered metal liquid-like plasmonic arrays. Nat Commun 2018; 9:3642. [PMID: 30194348 PMCID: PMC6128918 DOI: 10.1038/s41467-018-05920-z] [Citation(s) in RCA: 101] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Accepted: 08/04/2018] [Indexed: 12/14/2022] Open
Abstract
Liquid interfacial plasmonic platform is emerging for new sensors, catalysis, and tunable optical devices, but also promises an alternative for practical applications of surface-enhanced Raman spectroscopy (SERS). Here we show that vigorous mixing of chloroform with citrate-capped gold nanorod sols triggers the rapid self-assembly of three-dimensional plasmonic arrays at the chloroform/water (O/W) interface and produces a self-healing metal liquid-like brilliant golden droplet. The O phase itself generates stable SERS fingerprints and is a good homogeneous internal standard for quantitative analysis. This platform presents reversible O/W encasing in a common cuvette determined just by surface wettability of the container. Both O-in-W and W-in-O platforms exhibit excellent SERS sensitivity and reproducibility for different analytes by the use of a portable Raman device. It paves the way toward a practical and quantitative liquid-state SERS analyzer, likened to a simple UV–Vis spectrometer, that is far superior to typical solid substrate-based or nanoparticle sol-based analysis. The design and application of a liquid interfacial plasmonic platform promises for practical applications of surface-enhanced Raman scattering (SERS). Here, the authors report a reversible chloroform/water encasing strategy to self-assemble metal liquid-like 3D gold nanorod arrays with attractive SERS capability.
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Affiliation(s)
- Li Tian
- College of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China
| | - Mengke Su
- College of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China
| | - Fanfan Yu
- College of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China
| | - Yue Xu
- College of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China.,Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Life Sciences, and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan, 410082, China
| | - Xiaoyun Li
- Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
| | - Lei Li
- College of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China
| | - Honglin Liu
- College of Food Science and Engineering, Hefei University of Technology, Hefei, Anhui, 230009, China. .,Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Life Sciences, and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan, 410082, China.
| | - Weihong Tan
- Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, College of Life Sciences, and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan, 410082, China. .,Department of Chemistry and Department of Physiology and Functional Genomics, Center for Research at the Bio/Nano Interface, Health Cancer Center, UF Genetics Institute, McKnight Brain Institute, University of Florida, Gainesville, FL, 32611-7200, USA.
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21
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Yao Y, Ji J, Zhang H, Zhang K, Liu B, Yang P. Three-Dimensional Plasmonic Trap Array for Ultrasensitive Surface-Enhanced Raman Scattering Analysis of Single Cells. Anal Chem 2018; 90:10394-10399. [PMID: 30075082 DOI: 10.1021/acs.analchem.8b02252] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Yuanyuan Yao
- Department of Chemistry, Shanghai Stomatological Hospital, Institute of Biomedical Sciences, and State Key Lab of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, People’s Republic of China
| | - Ji Ji
- Department of Chemistry, Shanghai Stomatological Hospital, Institute of Biomedical Sciences, and State Key Lab of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, People’s Republic of China
| | - Hongding Zhang
- Department of Chemistry, Shanghai Stomatological Hospital, Institute of Biomedical Sciences, and State Key Lab of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, People’s Republic of China
| | - Kun Zhang
- Department of Chemistry, Shanghai Stomatological Hospital, Institute of Biomedical Sciences, and State Key Lab of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, People’s Republic of China
| | - Baohong Liu
- Department of Chemistry, Shanghai Stomatological Hospital, Institute of Biomedical Sciences, and State Key Lab of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, People’s Republic of China
| | - Pengyuan Yang
- Department of Chemistry, Shanghai Stomatological Hospital, Institute of Biomedical Sciences, and State Key Lab of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, People’s Republic of China
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22
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Shi R, Liu X, Ying Y. Facing Challenges in Real-Life Application of Surface-Enhanced Raman Scattering: Design and Nanofabrication of Surface-Enhanced Raman Scattering Substrates for Rapid Field Test of Food Contaminants. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:6525-6543. [PMID: 28920678 DOI: 10.1021/acs.jafc.7b03075] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Surface-enhanced Raman scattering (SERS) is capable of detecting a single molecule with high specificity and has become a promising technique for rapid chemical analysis of agricultural products and foods. With a deeper understanding of the SERS effect and advances in nanofabrication technology, SERS is now on the edge of going out of the laboratory and becoming a sophisticated analytical tool to fulfill various real-world tasks. This review focuses on the challenges that SERS has met in this progress, such as how to obtain a reliable SERS signal, improve the sensitivity and specificity in a complex sample matrix, develop simple and user-friendly practical sensing approach, reduce the running cost, etc. This review highlights the new thoughts on design and nanofabrication of SERS-active substrates for solving these challenges and introduces the recent advances of SERS applications in this area. We hope that our discussion will encourage more researches to address these challenges and eventually help to bring SERS technology out of the laboratory.
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Affiliation(s)
- Ruyi Shi
- College of Biosystems Engineering and Food Science , Zhejiang University , 866 Yuhangtang Road , Hangzhou , Zhejiang 310058 , China
| | - Xiangjiang Liu
- College of Biosystems Engineering and Food Science , Zhejiang University , 866 Yuhangtang Road , Hangzhou , Zhejiang 310058 , China
| | - Yibin Ying
- College of Biosystems Engineering and Food Science , Zhejiang University , 866 Yuhangtang Road , Hangzhou , Zhejiang 310058 , China
- Zhejiang A&F University , 88 Huanchengdong Road , Hangzhou , Zhejiang 311300 , China
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23
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Fernando JFS, Shortell MP, Firestein KL, Zhang C, Larionov KV, Popov ZI, Sorokin PB, Bourgeois L, Waclawik ER, Golberg DV. Photocatalysis with Pt-Au-ZnO and Au-ZnO Hybrids: Effect of Charge Accumulation and Discharge Properties of Metal Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:7334-7345. [PMID: 29809011 DOI: 10.1021/acs.langmuir.8b00401] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Metal-semiconductor hybrid nanomaterials are becoming increasingly popular for photocatalytic degradation of organic pollutants. Herein, a seed-assisted photodeposition approach is put forward for the site-specific growth of Pt on Au-ZnO particles (Pt-Au-ZnO). A similar approach was also utilized to enlarge the Au nanoparticles at epitaxial Au-ZnO particles (Au@Au-ZnO). An epitaxial connection at the Au-ZnO interface was found to be critical for the site-specific deposition of Pt or Au. Light on-off photocatalysis tests, utilizing a thiazine dye (toluidine blue) as a model organic compound, were conducted and confirmed the superior photodegradation properties of Pt-Au-ZnO hybrids compared to Au-ZnO. In contrast, Au-ZnO type hybrids were more effective toward photoreduction of toluidine blue to leuco-toluidine blue. It was deemed that photoexcited electrons of Au-ZnO (Au, ∼5 nm) possessed high reducing power owing to electron accumulation and negative shift in Fermi level/redox potential; however, exciton recombination due to possible Fermi-level equilibration slowed down the complete degradation of toluidine blue. In the case of Au@Au-ZnO (Au, ∼15 nm), the photodegradation efficiency was enhanced and the photoreduction rate reduced compared to Au-ZnO. Pt-Au-ZnO hybrids showed better photodegradation and mineralization properties compared to both Au-ZnO and Au@Au-ZnO owing to a fast electron discharge (i.e. better electron-hole seperation). However, photoexcited electrons lacked the reducing power for the photoreduction of toluidine blue. The ultimate photodegradation efficiencies of Pt-Au-ZnO, Au@Au-ZnO, and Au-ZnO were 84, 66, and 39%, respectively. In the interest of effective metal-semiconductor type photocatalysts, the present study points out the importance of choosing the right metal, depending on whether a photoreduction and/or photodegradation process is desired.
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Affiliation(s)
- Joseph F S Fernando
- School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty , Queensland University of Technology (QUT) , Brisbane , Queensland 4000 , Australia
| | - Matthew P Shortell
- School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty , Queensland University of Technology (QUT) , Brisbane , Queensland 4000 , Australia
| | - Konstantin L Firestein
- School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty , Queensland University of Technology (QUT) , Brisbane , Queensland 4000 , Australia
| | - Chao Zhang
- School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty , Queensland University of Technology (QUT) , Brisbane , Queensland 4000 , Australia
| | - Konstantin V Larionov
- Inorganic Nanomaterials Laboratory , National University of Science and Technology MISIS , Leninsky prospect 4 , Moscow 119049 , Russian Federation
| | - Zakhar I Popov
- Inorganic Nanomaterials Laboratory , National University of Science and Technology MISIS , Leninsky prospect 4 , Moscow 119049 , Russian Federation
| | - Pavel B Sorokin
- Inorganic Nanomaterials Laboratory , National University of Science and Technology MISIS , Leninsky prospect 4 , Moscow 119049 , Russian Federation
| | - Laure Bourgeois
- Monash Centre for Electron Microscopy, Department of Materials Science and Engineering , Monash University , Melbourne , Victoria 3800 , Australia
| | - Eric R Waclawik
- School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty , Queensland University of Technology (QUT) , Brisbane , Queensland 4000 , Australia
| | - Dmitri V Golberg
- School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty , Queensland University of Technology (QUT) , Brisbane , Queensland 4000 , Australia
- International Center for Materials Nanoarchitectonics (MANA) , National Institute for Materials Science (NIMS) , Namiki 1-1 , Tsukuba , Ibaraki 3050044 , Japan
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24
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Smirnov E, Peljo P, Girault HH. Gold Raspberry-Like Colloidosomes Prepared at the Water-Nitromethane Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:2758-2763. [PMID: 29376386 DOI: 10.1021/acs.langmuir.7b03532] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this study, we propose a simple shake-flask method to produce micron-size colloidosomes from a liquid-liquid interface functionalized with a gold nanoparticle (AuNP) film. A step-by-step extraction process of an organic phase partially miscible with water led to the formation of raspberry-like structures covered and protected by a gold nanofilm. The distinctive feature of the prepared colloidosomes is a very thin shell consisting of small AuNPs of 12 or 38 nm in diameter instead of several hundred nanometers reported previously. The interesting and remarkable property of the proposed approach is their reversibility: the colloidosomes may be easily transformed back to a nanofilm state simply by adding pure organic solvent. The obtained colloidosomes have a broadband absorbance spectrum, which makes them of great interest in applications such as photothermal therapy, surface-enhanced Raman spectroscopy studies, and microreactor vesicles for interfacial electrocatalysis.
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Affiliation(s)
- Evgeny Smirnov
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne , Rue de l'Industrie 17, CH-1951 Sion, Switzerland
| | - Pekka Peljo
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne , Rue de l'Industrie 17, CH-1951 Sion, Switzerland
| | - Hubert H Girault
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne , Rue de l'Industrie 17, CH-1951 Sion, Switzerland
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25
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Scanlon MD, Smirnov E, Stockmann TJ, Peljo P. Gold Nanofilms at Liquid–Liquid Interfaces: An Emerging Platform for Redox Electrocatalysis, Nanoplasmonic Sensors, and Electrovariable Optics. Chem Rev 2018; 118:3722-3751. [DOI: 10.1021/acs.chemrev.7b00595] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Micheál D. Scanlon
- The Bernal Institute and Department of Chemical Sciences, School of Natural Sciences, University of Limerick (UL), Limerick V94 T9PX, Ireland
| | - Evgeny Smirnov
- Laboratoire d’Electrochimie Physique et Analytique (LEPA), École Polytechnique Fédérale de Lausanne (EPFL), Rue de l’Industrie 17, CH-1951 Sion, Switzerland
| | - T. Jane Stockmann
- Interfaces, Traitements, Organisation et Dynamique des Systèmes, CNRS-UMR 7086, Sorbonne Paris Cité, Paris Diderot University, 15 Rue J.A. Baïf, 75013 Paris, France
| | - Pekka Peljo
- Laboratoire d’Electrochimie Physique et Analytique (LEPA), École Polytechnique Fédérale de Lausanne (EPFL), Rue de l’Industrie 17, CH-1951 Sion, Switzerland
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26
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Ienaga T, Okada S, Nakahara Y, Watanabe M, Tamai T, Yajima S, Kimura K. Comparison of Physical Adsorption Strength of Protective Agents via Ligand Exchange of Silver Nanoparticles Prepared by Vacuum Evaporation on Running Oil Substrate. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2017. [DOI: 10.1246/bcsj.20170189] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takashi Ienaga
- Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University, 930 Sakae-dani, Wakayama 640-8510
| | - Soichiro Okada
- Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University, 930 Sakae-dani, Wakayama 640-8510
| | - Yoshio Nakahara
- Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University, 930 Sakae-dani, Wakayama 640-8510
| | - Mitsuru Watanabe
- Morinomiya Center, Osaka Research Institute of Industrial Science and Technology, 1-6-50 Morinomiya, Joto-ku, Osaka 536-8553
| | - Toshiyuki Tamai
- Morinomiya Center, Osaka Research Institute of Industrial Science and Technology, 1-6-50 Morinomiya, Joto-ku, Osaka 536-8553
| | - Setsuko Yajima
- Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University, 930 Sakae-dani, Wakayama 640-8510
| | - Keiichi Kimura
- Department of Applied Chemistry, Faculty of Systems Engineering, Wakayama University, 930 Sakae-dani, Wakayama 640-8510
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27
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Peljo P, Scanlon MD, Olaya AJ, Rivier L, Smirnov E, Girault HH. Redox Electrocatalysis of Floating Nanoparticles: Determining Electrocatalytic Properties without the Influence of Solid Supports. J Phys Chem Lett 2017; 8:3564-3575. [PMID: 28707892 DOI: 10.1021/acs.jpclett.7b00685] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Redox electrocatalysis (catalysis of electron-transfer reactions by floating conductive particles) is discussed from the point-of-view of Fermi level equilibration, and an overall theoretical framework is given. Examples of redox electrocatalysis in solution, in bipolar configuration, and at liquid-liquid interfaces are provided, highlighting that bipolar and liquid-liquid interfacial systems allow the study of the electrocatalytic properties of particles without effects from the support, but only liquid-liquid interfaces allow measurement of the electrocatalytic current directly. Additionally, photoinduced redox electrocatalysis will be of interest, for example, to achieve water splitting.
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Affiliation(s)
- Pekka Peljo
- Laboratoire d'Electrochimie Physique et Analytique (LEPA), École Polytechnique Fédérale de Lausanne (EPFL) , Rue de l'Industrie 17, CH-1951 Sion, Switzerland
| | - Micheál D Scanlon
- Bernal Institute and Department of Chemical Sciences, School of Natural Sciences, University of Limerick (UL) , Limerick V94 T9PX, Ireland
| | - Astrid J Olaya
- Laboratoire d'Electrochimie Physique et Analytique (LEPA), École Polytechnique Fédérale de Lausanne (EPFL) , Rue de l'Industrie 17, CH-1951 Sion, Switzerland
| | - Lucie Rivier
- Laboratoire d'Electrochimie Physique et Analytique (LEPA), École Polytechnique Fédérale de Lausanne (EPFL) , Rue de l'Industrie 17, CH-1951 Sion, Switzerland
| | - Evgeny Smirnov
- Laboratoire d'Electrochimie Physique et Analytique (LEPA), École Polytechnique Fédérale de Lausanne (EPFL) , Rue de l'Industrie 17, CH-1951 Sion, Switzerland
| | - Hubert H Girault
- Laboratoire d'Electrochimie Physique et Analytique (LEPA), École Polytechnique Fédérale de Lausanne (EPFL) , Rue de l'Industrie 17, CH-1951 Sion, Switzerland
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28
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Sachdev S, Maugi R, Woolley J, Kirk C, Zhou Z, Christie SDR, Platt M. Synthesis of Gold Nanoparticles Using the Interface of an Emulsion Droplet. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:5464-5472. [PMID: 28514172 DOI: 10.1021/acs.langmuir.7b00564] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A facile and rapid method for synthesizing single crystal gold spherical or platelet (nonspherical) particles is reported. The reaction takes place at the interface of two immiscible liquids where the reducing agent decamethylferrocene (DmFc) was initially added to hexane and gold chloride (AuCl4-) to an aqueous phase. The reaction is spontaneous at room temperature, leading to the creation of Au nanoparticles (AuNP). A flow focusing microfluidic chip was used to create emulsion droplets, allowing the same reaction to take place within a series of microreactors. The technique allows the number of droplets, their diameter, and even the concentration of reactants in both phases to be controlled. The size and shape of the AuNP are dependent upon the concentration of the reactants and the size of the droplets. By tuning the reaction parameters, the synthesized nanoparticles vary from nanometer to micrometer sized spheres or platelets. The surfactant used to stabilize the emulsion was also shown to influence the particle shape. Finally, the addition of other nanoparticles within the droplet allows for core@shell particles to be readily formed, and we believe this could be a versatile platform for the large scale production of core@shell particles.
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Affiliation(s)
| | | | | | - Caroline Kirk
- School of Chemistry, University of Edinburgh , David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
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29
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Gschwend GC, Smirnov E, Peljo P, Girault HH. Electrovariable gold nanoparticle films at liquid–liquid interfaces: from redox electrocatalysis to Marangoni-shutters. Faraday Discuss 2017; 199:565-583. [DOI: 10.1039/c6fd00238b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Control over the physical properties of nanoparticle assemblies at a liquid–liquid interface is a key technological advancement to realize the dream of smart electrovariable nanosystems. Electrified interfaces, such as the interface between two immiscible electrolytes solutions (ITIES), are almost an ideal platform for realizing this dream. Here, we show that the Galvani potential difference across soft interfaces can be effectively used to manipulate: (i) the reactivity of gold nanoparticle assemblies through varying the Fermi level (both chemically and electrochemically); (ii) the location distribution of the nanoparticles at the liquid–liquid interface. In the first case, in addition to our previous studies on electron transfer reactions (ET) across the ITIES, we used intensity modulated photocurrent spectroscopy (IMPS) to study the kinetics of photo-induced electrochemical reactions at the ITIES. As expected, the direct adsorption of gold nanoparticles at the interface modifies the kinetics of the ET reaction (so-called, interfacial redox electrocatalysis), however it did not lead to an increased photocurrent by “plasmonic enhancement”. Rather, we found that the product separation depends on double layer effects while the product recombination is controlled by the Galvani potential difference between the two phases. In the second case, we demonstrated that polarizing the ITIES caused migration of gold nanoparticles from the middle region of the cell to its periphery. We called such systems “Marangoni-type shutters”. This type of electrovariable plasmonic system did not experience diffusion limitation in terms of the adsorption/desorption of nanoparticles and the entire movement of nanoparticle assemblies happened almost instantly (within a second). It opens a fresh view on electrovariable plasmonics and presents new opportunities to create smart nanosystems at the ITIES driven with an electric field.
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Affiliation(s)
- Grégoire C. Gschwend
- Laboratoire d'Electrochimie Physique et Analytique
- Ecole Polytechnique Fédérale de Lausanne
- CH-1951 Sion
- Switzerland
| | - Evgeny Smirnov
- Laboratoire d'Electrochimie Physique et Analytique
- Ecole Polytechnique Fédérale de Lausanne
- CH-1951 Sion
- Switzerland
| | - Pekka Peljo
- Laboratoire d'Electrochimie Physique et Analytique
- Ecole Polytechnique Fédérale de Lausanne
- CH-1951 Sion
- Switzerland
| | - Hubert H. Girault
- Laboratoire d'Electrochimie Physique et Analytique
- Ecole Polytechnique Fédérale de Lausanne
- CH-1951 Sion
- Switzerland
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Smirnov E, Peljo P, Girault HH. Self-assembly and redox induced phase transfer of gold nanoparticles at a water–propylene carbonate interface. Chem Commun (Camb) 2017; 53:4108-4111. [DOI: 10.1039/c6cc09638g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Citrate-stabilized gold nanoparticles were found to spontaneously self-assemble into a lustrous film at a bare water–propylene carbonate interface after vigorous shaking, due to the extremely low interfacial tension. The presence of the electron donor, tetrathiafulvalene, in the oil phase, led to the extraction of particles into the organic phase.
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Affiliation(s)
- Evgeny Smirnov
- Laboratoire d'Electrochimie Physique et Analytique
- Ecole Polytechnique Fédérale de Lausanne
- CH-1951 Sion
- Switzerland
| | - Pekka Peljo
- Laboratoire d'Electrochimie Physique et Analytique
- Ecole Polytechnique Fédérale de Lausanne
- CH-1951 Sion
- Switzerland
| | - Hubert H. Girault
- Laboratoire d'Electrochimie Physique et Analytique
- Ecole Polytechnique Fédérale de Lausanne
- CH-1951 Sion
- Switzerland
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Velleman L, Sikdar D, Turek VA, Kucernak AR, Roser SJ, Kornyshev AA, Edel JB. Tuneable 2D self-assembly of plasmonic nanoparticles at liquid|liquid interfaces. NANOSCALE 2016; 8:19229-19241. [PMID: 27759133 DOI: 10.1039/c6nr05081f] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Understanding the structure and assembly of nanoparticles at liquid|liquid interfaces is paramount to their integration into devices for sensing, catalysis, electronics and optics. However, many difficulties arise when attempting to resolve the structure of such interfacial assemblies. In this article we use a combination of X-ray diffraction and optical reflectance to determine the structural arrangement and plasmon coupling between 12.8 nm diameter gold nanoparticles assembled at a water|1,2-dichloroethane interface. The liquid|liquid interface provides a molecularly flat and defect-correcting platform for nanoparticles to self-assemble. The amount of nanoparticles assembling at the interface can be controlled via the concentration of electrolyte within either the aqueous or organic phase. At higher electrolyte concentration more nanoparticles can settle at the liquid|liquid interface resulting in a decrease in nanoparticle spacing as observed from X-ray diffraction experiments. The plasmonic coupling between the nanoparticles as they come closer together is observed by a red-shift in the optical reflectance spectra. The optical reflectance and the X-ray diffraction data are combined to introduce a new 'plasmon ruler'. This allows extraction of structural information from simple optical spectroscopy techniques, with important implications for understanding the structure of self-assembled nanoparticle films at liquid interfaces.
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Affiliation(s)
- Leonora Velleman
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, Exhibition Road, South Kensington, London, SW7 2AZ, UK.
| | - Debabrata Sikdar
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, Exhibition Road, South Kensington, London, SW7 2AZ, UK.
| | - Vladimir A Turek
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, Exhibition Road, South Kensington, London, SW7 2AZ, UK.
| | - Anthony R Kucernak
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, Exhibition Road, South Kensington, London, SW7 2AZ, UK.
| | - Steve J Roser
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
| | - Alexei A Kornyshev
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, Exhibition Road, South Kensington, London, SW7 2AZ, UK.
| | - Joshua B Edel
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, Exhibition Road, South Kensington, London, SW7 2AZ, UK.
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Hua X, Bevan MA, Frechette J. Reversible Partitioning of Nanoparticles at an Oil-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:11341-11352. [PMID: 27564252 DOI: 10.1021/acs.langmuir.6b02255] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The reversible adsorption of nanoparticles (NPs) to oil-water interfaces has been observed experimentally, however, models capable of interpreting and predicting the equilibrium partitioning of particles between bulk media and fluid interfaces are still lacking. Here we characterize the adsorption of 5 nm gold NPs functionalized with ion-pair ligands at the toluene-water interface. Partitioning of the NPs between the bulk aqueous phase and the interface is measured via absorbance spectroscopy for two different aqueous-phase pH values (11.0 and 11.7) and over several orders of magnitude of aqueous phase NP concentration. The surface pressure of the interfacial film in equilibrium with the bulk aqueous phase is measured using the pendant drop method. We determine the range of surface pressure where the adsorption is reversible as well as conditions under which the adsorbed NPs are irreversibly adsorbed at the oil-water interface. We analyze together the adsorption and surface pressure isotherms to obtain the two-dimensional equations of state (EOS) for the NPs in equilibrium with the bulk aqueous phase. The experimental data are then compared to the Frumkin models. We find that the adsorption isotherm and the equation of state show good agreement at low coverage with the Frumkin equations; however, both curves cannot be described with the same parameters. We also show that the low-coverage portion of the EOS can also be described by a wetting model. We hypothesize that deviations from models at higher coverage are likely due to nonequilibrium effects and possible coadsorption.
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Affiliation(s)
- Xiaoqing Hua
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University , Baltimore, Maryland 21218, United States
| | - Michael A Bevan
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University , Baltimore, Maryland 21218, United States
| | - Joelle Frechette
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University , Baltimore, Maryland 21218, United States
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Ding T, Rudrum AW, Herrmann LO, Turek V, Baumberg JJ. Polymer-assisted self-assembly of gold nanoparticle monolayers and their dynamical switching. NANOSCALE 2016; 8:15864-9. [PMID: 27546585 PMCID: PMC5166565 DOI: 10.1039/c6nr05199e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Dynamic switching of plasmonic monolayers built of gold nanoparticles (AuNPs) is achieved using nano-coatings of poly(isopropyl acrylamide) (PNIPAM). The distance between AuNPs can be dynamically tuned through the repeatable expansion and contraction of the PNIPAM shells at different temperatures, which results in rapid switching of the optical properties of the AuNP monolayer.
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Affiliation(s)
- Tao Ding
- Nanophotonics Centre , Cavendish Laboratory , University of Cambridge , CB3 0HE , UK . ;
| | - Adam W. Rudrum
- Nanophotonics Centre , Cavendish Laboratory , University of Cambridge , CB3 0HE , UK . ;
| | - Lars O. Herrmann
- Nanophotonics Centre , Cavendish Laboratory , University of Cambridge , CB3 0HE , UK . ;
| | - Vladimir Turek
- Nanophotonics Centre , Cavendish Laboratory , University of Cambridge , CB3 0HE , UK . ;
| | - Jeremy J. Baumberg
- Nanophotonics Centre , Cavendish Laboratory , University of Cambridge , CB3 0HE , UK . ;
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Smirnov E, Peljo P, Scanlon MD, Gumy F, Girault HH. Self-healing gold mirrors and filters at liquid-liquid interfaces. NANOSCALE 2016; 8:7723-7737. [PMID: 27001646 DOI: 10.1039/c6nr00371k] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The optical and morphological properties of lustrous metal self-healing liquid-like nanofilms were systematically studied for different applications (e.g., optical mirrors or filters). These nanofilms were formed by a one-step self-assembly methodology of gold nanoparticles (AuNPs) at immiscible water-oil interfaces, previously reported by our group. We investigated a host of experimental variables and herein report their influence on the optical properties of nanofilms: AuNP mean diameter, interfacial AuNP surface coverage, nature of the organic solvent, and nature of the lipophilic organic molecule that caps the AuNPs in the interfacial nanofilm. To probe the interfacial gold nanofilms we used in situ (UV-vis-NIR spectroscopy and optical microscopy) as well as ex situ (SEM and TEM of interfacial gold nanofilms transferred to silicon substrates) techniques. The interfacial AuNP surface coverage strongly influenced the morphology of the interfacial nanofilms, and in turn their maximum reflectance and absorbance. We observed three distinct morphological regimes; (i) smooth 2D monolayers of "floating islands" of AuNPs at low surface coverages, (ii) a mixed 2D/3D regime with the beginnings of 3D nanostructures consisting of small piles of adsorbed AuNPs even under sub-full-monolayer conditions and, finally, (iii) a 3D regime characterised by the 2D full-monolayer being covered in significant piles of adsorbed AuNPs. A maximal value of reflectance reached 58% in comparison with a solid gold mirror, when 38 nm mean diameter AuNPs were used at a water-nitrobenzene interface. Meanwhile, interfacial gold nanofilms prepared with 12 nm mean diameter AuNPs exhibited the highest extinction intensities at ca. 690 nm and absorbance around 90% of the incident light, making them an attractive candidate for filtering applications. Furthermore, the interparticle spacing, and resulting interparticle plasmon coupling derived optical properties, varied significantly on replacing tetrathiafulvalene with neocuproine as the AuNP capping ligand in the nanofilm. These interfacial nanofilms formed with neocuproine and 38 nm mean diameter AuNPs, at monolayer surface coverages and above, were black due to aggregation and broadband absorbance.
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Affiliation(s)
- Evgeny Smirnov
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Rue de l'Industrie 17, CH-1951 Sion, Switzerland.
| | - Pekka Peljo
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Rue de l'Industrie 17, CH-1951 Sion, Switzerland.
| | - Micheál D Scanlon
- Department of Chemistry, the Tyndall National Institute and the Analytical & Biological Chemistry Research Facility (ABCRF), University College Cork, Cork, Ireland
| | - Frederic Gumy
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Rue de l'Industrie 17, CH-1951 Sion, Switzerland.
| | - Hubert H Girault
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Rue de l'Industrie 17, CH-1951 Sion, Switzerland.
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Smirnov E, Peljo P, Scanlon MD, Girault HH. Gold Nanofilm Redox Catalysis for Oxygen Reduction at Soft Interfaces. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2015.10.104] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Lee YH, Lee HK, Ho JYC, Yang Y, Ling XY. Assembling substrate-less plasmonic metacrystals at the oil/water interface for multiplex ultratrace analyte detection. Analyst 2016; 141:5107-12. [DOI: 10.1039/c6an01239f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Designing substrate-less plasmonic metacrystals for the multiplex ultratrace detection of analytes from both organic and aqueous phases.
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Affiliation(s)
- Yih Hong Lee
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
| | - Hiang Kwee Lee
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
| | - Jonathan Yong Chew Ho
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
| | - Yijie Yang
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
| | - Xing Yi Ling
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
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Smirnov E, Peljo P, Scanlon MD, Girault HH. Interfacial Redox Catalysis on Gold Nanofilms at Soft Interfaces. ACS NANO 2015; 9:6565-6575. [PMID: 26039934 DOI: 10.1021/acsnano.5b02547] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Soft or "liquid-liquid" interfaces were functionalized by roughly half a monolayer of mirror-like nanofilms of gold nanoparticles using a precise interfacial microinjection method. The surface coverage of the nanofilm was characterized by ion transfer voltammetry. These gold nanoparticle films represent an ideal model system for studying both the thermodynamic and kinetic aspects of interfacial redox catalysis. The electric polarization of these soft interfaces is easily controllable, and thus the Fermi level of the electrons in the interfacial gold nanoparticle film can be easily manipulated. Here, we study interfacial redox catalysis between two redox couples located in adjacent immiscible phases and highlight the catalytic properties of a gold nanoparticle film toward heterogeneous electron transfer reactions.
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Affiliation(s)
- Evgeny Smirnov
- †Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland
| | - Pekka Peljo
- †Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland
| | - Micheál D Scanlon
- †Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland
- ‡Department of Chemistry and the Tyndall National Institute, University College Cork, Cork, Ireland
| | - Hubert H Girault
- †Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland
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Scanlon MD, Peljo P, Méndez MA, Smirnov E, Girault HH. Charging and discharging at the nanoscale: Fermi level equilibration of metallic nanoparticles. Chem Sci 2015; 6:2705-2720. [PMID: 28706663 PMCID: PMC5489025 DOI: 10.1039/c5sc00461f] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Accepted: 03/23/2015] [Indexed: 12/22/2022] Open
Abstract
The redox properties of metallic nanoparticles are discussed, in particular the relationships between excess charge, size and the Fermi level of the electrons. The redox potentials are derived using simple electrostatic models to provide a straightforward understanding of the basic phenomena. The different techniques used to measure the variation of Fermi level are presented. Finally, redox aspects of processes such as toxicity, electrochromicity and surface plasmon spectroscopy are discussed.
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Affiliation(s)
- Micheál D Scanlon
- Laboratoire d'Electrochimie Physique et Analytique , Ecole Polytechnique Fédérale de Lausanne , Station 6 , CH-1015 Lausanne , Switzerland .
- Department of Chemistry , Tyndall National Institute , University College Cork , Cork , Ireland
| | - Pekka Peljo
- Laboratoire d'Electrochimie Physique et Analytique , Ecole Polytechnique Fédérale de Lausanne , Station 6 , CH-1015 Lausanne , Switzerland .
| | - Manuel A Méndez
- Laboratoire d'Electrochimie Physique et Analytique , Ecole Polytechnique Fédérale de Lausanne , Station 6 , CH-1015 Lausanne , Switzerland .
| | - Evgeny Smirnov
- Laboratoire d'Electrochimie Physique et Analytique , Ecole Polytechnique Fédérale de Lausanne , Station 6 , CH-1015 Lausanne , Switzerland .
| | - Hubert H Girault
- Laboratoire d'Electrochimie Physique et Analytique , Ecole Polytechnique Fédérale de Lausanne , Station 6 , CH-1015 Lausanne , Switzerland .
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