51
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Ma W, Xu L, Wang L, Kuang H, Xu C. Orientational nanoparticle assemblies and biosensors. Biosens Bioelectron 2015; 79:220-36. [PMID: 26708241 DOI: 10.1016/j.bios.2015.12.021] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Revised: 12/06/2015] [Accepted: 12/12/2015] [Indexed: 02/01/2023]
Abstract
Assemblies of nanoparticles (NPs) have regional correlated properties with new features compared to individual NPs or random aggregates. The orientational NP assembly contributes greatly to the collective interaction of individual NPs with geometrical dependence. Therefore, orientational NPs assembly techniques have emerged as promising tools for controlling inorganic NPs spatial structures with enhanced interesting properties. The research fields of orientational NP assembly have developed rapidly with characteristics related to the different methods used, including chemical, physical and biological techniques. The current and potential applications, important challenges remain to be investigated. An overview of recent developments in orientational NPs assemblies, the multiple strategies, biosensors and challenges will be discussed in this review.
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Affiliation(s)
- Wei Ma
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Liguang Xu
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Libing Wang
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China.
| | - Hua Kuang
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China
| | - Chuanlai Xu
- State Key Lab of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, PR China.
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52
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Li R, Lv H, Zhang X, Liu P, Chen L, Cheng J, Zhao B. Vibrational spectroscopy and density functional theory study of 4-mercaptobenzoic acid. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 148:369-374. [PMID: 25913136 DOI: 10.1016/j.saa.2015.03.132] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 03/18/2015] [Accepted: 03/29/2015] [Indexed: 06/04/2023]
Abstract
In this paper, 4-mercaptobenzoic acid (4-MBA/pMBA) was designed as a model molecule for theoretical and experimental studies of the molecule structure. Density functional theory (DFT) calculations have been performed to predict the IR and Raman spectra for the molecule. In addition, Fourier transform infrared (FTIR) and Raman spectra of the compound have been obtained experimentally. Based on the modeling results obtained at the B3LYP/6-311++G(∗∗) level, all FTIR and Raman bands of the compound obtained experimentally were assigned. Our calculated vibrational frequencies are in good agreement with the experimental vales. The molecular electrostatic potential surface calculation was performed and the result suggested that the 4-MBA had two hydrogen bond donors and three hydrogen bond acceptors. HOMO-LUMO gap was also obtained theoretically at B3LYP/6-311++G(∗∗) level.
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Affiliation(s)
- Ran Li
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China
| | - Haiming Lv
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China; Center for Composite Material, Harbin Institute of Technology, Harbin 150001, China
| | - Xiaolei Zhang
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China
| | - Peipei Liu
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China
| | - Lei Chen
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China
| | - Jianbo Cheng
- The Laboratory of Theoretical and Computational Chemistry, School of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Bing Zhao
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, China.
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53
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Tran TT, Fang J, Zhang H, Rath P, Bray K, Sandstrom RG, Shimoni O, Toth M, Aharonovich I. Facile Self-Assembly of Quantum Plasmonic Circuit Components. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:4048-4053. [PMID: 26036242 DOI: 10.1002/adma.201501142] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2015] [Revised: 04/23/2015] [Indexed: 06/04/2023]
Abstract
A facile and cost-effective self-assembly route to engineering of vital quantum plasmonic circuit components is reported. By modifying the surface energy of silver nanowires, the position and density of attached nanodiamonds can be maneuvered leading to silver nanowire/nanodiamond(s) hybrid nanostructures. These structures exhibit strong plasmonic coupling effects and thus hold promise to serve as quantum plasmonic components.
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Affiliation(s)
- Toan Trong Tran
- School of Physics and Advanced Materials, University of Technology Sydney, Ultimo, NSW, 2007, Australia
| | - Jinghua Fang
- Plasma Nanoscience Laboratories, Manufacturing Flagship, Commonwealth Scientific and Industrial Research Organisation (CSIRO), P.O. Box 218, Lindfield, NSW, 2070, Australia
| | - Hao Zhang
- School of Physics and Advanced Materials, University of Technology Sydney, Ultimo, NSW, 2007, Australia
| | - Patrik Rath
- Institute of Nanotechnology, Karlsruhe Institute of Technology, 76344, Eggenstein-Leopoldshafen, Germany
| | - Kerem Bray
- School of Physics and Advanced Materials, University of Technology Sydney, Ultimo, NSW, 2007, Australia
| | - Russell G Sandstrom
- School of Physics and Advanced Materials, University of Technology Sydney, Ultimo, NSW, 2007, Australia
| | - Olga Shimoni
- School of Physics and Advanced Materials, University of Technology Sydney, Ultimo, NSW, 2007, Australia
| | - Milos Toth
- School of Physics and Advanced Materials, University of Technology Sydney, Ultimo, NSW, 2007, Australia
| | - Igor Aharonovich
- School of Physics and Advanced Materials, University of Technology Sydney, Ultimo, NSW, 2007, Australia
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54
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Stewart AF, Gagnon BP, Walker GC. Forming End-to-End Oligomers of Gold Nanorods Using Porphyrins and Phthalocyanines. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6902-6908. [PMID: 26051105 DOI: 10.1021/acs.langmuir.5b01323] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The illumination of aggregated metal nanospecies can create strong local electric fields to brighten Raman scattering. This study describes a procedure to self-assemble gold nanorods (NRs) through the use of porphyrin and phthalocyanine agents to create reproducibly stable and robust NR aggregates in the form of end-to-end oligomers. Narrow inter-rod gaps result, creating electric field "hot spots" between the NRs. The organic linker molecules themselves are potential Raman-based optical labels, and the result is significant numbers of Raman-active species located in the hot spots. NR polymerization was quenched by phospholipid encapsulation, which allows for control of the polydispersity of the aggregate solution, to optimize the surface-enhanced Raman scattering (SERS) enhancement and permitted the aqueous solubility of the aggregates. The increased presence of Raman-active species in the hot spots and the optimizing of solution polydispersity resulted in the observation of scattering enhancements by encapsulated porphyrins/phthalocyanines of up to 3500-fold over molecular chromophores lacking the NR oligomer host.
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Affiliation(s)
- Alexander F Stewart
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S3H6, Canada
| | - Brandon P Gagnon
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S3H6, Canada
| | - Gilbert C Walker
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S3H6, Canada
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55
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Xi C, Marina PF, Xia H, Wang D. Directed self-assembly of gold nanoparticles into plasmonic chains. SOFT MATTER 2015; 11:4562-71. [PMID: 25994925 DOI: 10.1039/c5sm00900f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The plasmonic behavior of metals at the nanoscale is not only appealing for fundamental studies, but also very useful for the development of innovative photonic devices. The past few decades have witnessed great progress in colloidal synthesis of monodisperse metal nanoparticles with defined shapes. This has significantly fueled up the research of directing the metal nanoparticles to self-assemble into tailored extended structures, especially low dimensional ones, for a better control and manipulation of the interactions of the metal nanoparticles with light. In parallel, theories for a better description of nanoplasmonics have been increasingly developed and improved. Thus, the present review is focused on the overview of current experimental and theoretical developments in the directed self-assembly of metal nanoparticles with tailored plasmonic properties, which, hopefully, will provide useful guidelines for future research studies and applications of nanoplasmonics.
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Affiliation(s)
- Chunxiao Xi
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China.
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56
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Fateixa S, Nogueira HIS, Trindade T. Hybrid nanostructures for SERS: materials development and chemical detection. Phys Chem Chem Phys 2015; 17:21046-71. [PMID: 25960180 DOI: 10.1039/c5cp01032b] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This review focuses on recent developments in hybrid and nanostructured substrates for SERS (surface-enhanced Raman scattering) studies. Thus substrates composed of at least two distinct types of materials, in which one is a SERS active metal, are considered here aiming at their use as platforms for chemical detection in a variety of contexts. Fundamental aspects related to the SERS effect and plasmonic behaviour of nanometals are briefly introduced. The materials described include polymer nanocomposites containing metal nanoparticles and coupled inorganic nanophases. Chemical approaches to tailor the morphological features of these substrates in order to get high SERS activity are reviewed. Finally, some perspectives for practical applications in the context of chemical detection of analytes using such hybrid platforms are presented.
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Affiliation(s)
- Sara Fateixa
- Department of Chemistry-CICECO University of Aveiro, 3810-193 Aveiro, Portugal.
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57
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Lai F, Borca-Tasciuc T, Plawsky J. Controlling directed self-assembly of gold nanorods in patterned PS-b-PMMA thin films. NANOTECHNOLOGY 2015; 26:055301. [PMID: 25580876 DOI: 10.1088/0957-4484/26/5/055301] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present a facile strategy for the directed self-assembly of gold nanorods (AuNRs) in patterned block copolymer (BCP) thin films. Parallel arrangement of AuNRs relative to the geometric confinement generated by selective removal of one block domain was achieved. Deposition of AuNRs with aspect ratios from 3.3 to 5.8 was accomplished and the alignment of the NRs within the channels was controlled primarily by capillary forces and the channel geometry. Ordered AuNR assembly in the BCP pattern can be achieved at high surface coverages, >30%, though the surface coverage depends on the aspect ratio of the NRs. Larger NRs align in the channels more readily, but pack at slightly lower densities.
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Affiliation(s)
- Fengyuan Lai
- Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
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58
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Zhang L, Dai L, Rong Y, Liu Z, Tong D, Huang Y, Chen T. Light-triggered reversible self-assembly of gold nanoparticle oligomers for tunable SERS. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1164-71. [PMID: 25540841 DOI: 10.1021/la504365b] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
A photoresponsive amphiphilic gold nanoparticle (AuNP) is achieved through the decoration of AuNP with hydrophilic poly(ethylene glycol) (PEG) and hydrophobic photoresponsive polymethacrylate containing spiropyran units (PSPMA). Owing to the photoresponsive property of spiropyran units, the amphiphilic AuNPs can easily achieve the controllable assembly/disassembly behaviors under the trigger by light. Under visible light, spiropyran units provide weak intermolecular interactions between neighbored AuNPs, leading to isolated AuNPs in the solution. While under UV light irradiation, spiropyran units in the polymer brushes transform into merocyanine isomer with conjugated structure and zwitterionic state, promoting the integration of adjacent AuNPs through π-π stacking and electrostatic attractions, further leading to the formation of Au oligomers. The smart reversible AuNP oligomers exhibited switchable plasmonic coupling for tuning surface-enhanced Raman scattering (SERS) activity, which is promising for the application of SERS based sensors and optical imaging.
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Affiliation(s)
- Lei Zhang
- Division of Polymer and Composite Materials, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Science , 1219 Zhongguan West Road, Ningbo 315201, China
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59
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Saha A, Jana NR. Paper-based microfluidic approach for surface-enhanced raman spectroscopy and highly reproducible detection of proteins beyond picomolar concentration. ACS APPLIED MATERIALS & INTERFACES 2015; 7:996-1003. [PMID: 25521159 DOI: 10.1021/am508123x] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Although microfluidic approach is widely used in various point of care diagnostics, its implementation in surface enhanced Raman spectroscopy (SERS)-based detection is challenging. This is because SERS signal depends on plasmonic nanoparticle aggregation induced generation of stable electromagnetic hot spots and in currently available microfluidic platform this condition is difficult to adapt. Here we show that SERS can be adapted using simple paper based microfluidic system where both the plasmonic nanomaterials and analyte are used in mobile phase. This approach allows analyte induced controlled particle aggregation and electromagnetic hot spot generation inside the microfluidic channel with the resultant SERS signal, which is highly reproducible and sensitive. This approach has been used for reproducible detection of protein in the pico to femtomolar concentration. Presented approach is simple, rapid, and cost-effective, and requires low sample volume. Method can be extended for SERS-based detection of other biomolecules.
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Affiliation(s)
- Arindam Saha
- Centre for Advanced Materials, Indian Association for the Cultivation of Science , Kolkata 700032, India
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60
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Feng C, Zhao Y, Jiang Y. Silver nano-dendritic crystal film: a rapid dehydration SERS substrate of totally new concept. RSC Adv 2015. [DOI: 10.1039/c4ra11376d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This work provides a rapid dehydration SERS substrate with the potential of rapid, convenient and real-time SERS detection for practical application.
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Affiliation(s)
- Chao Feng
- Institute of Laser Engineering
- Beijing University of Technology
- Beijing
- PR China
| | - Yan Zhao
- Institute of Laser Engineering
- Beijing University of Technology
- Beijing
- PR China
| | - Yijian Jiang
- Institute of Laser Engineering
- Beijing University of Technology
- Beijing
- PR China
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61
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Merlen A, Chaigneau M, Coussan S. Vibrational modes of aminothiophenol: a TERS and DFT study. Phys Chem Chem Phys 2015; 17:19134-8. [DOI: 10.1039/c5cp01579k] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We report Tip Enhanced Raman Spectroscopy (TERS) mapping and Density Functional (DFT) calculations of aminothiophenol (ATP) grafted on a gold surface.
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Affiliation(s)
- A. Merlen
- IM2NP
- UMR-CNRS 7334
- Site de l'Université de Toulon
- 83957 La Garde Cedex
- France
| | - M. Chaigneau
- LPICM
- UMR-CNRS 7647
- Ecole Polytechnique
- Palaiseau
- France
| | - S. Coussan
- Laboratoire Physique des Interactions Ioniques et Moléculaires
- UMR 7345-CNRS
- Aix-Marseille Université
- Centre St-Jérôme
- 13397 Marseille Cedex 20
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62
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D. S. Indrasekara AS, Thomas R, Fabris L. Plasmonic properties of regiospecific core–satellite assemblies of gold nanostars and nanospheres. Phys Chem Chem Phys 2015; 17:21133-42. [DOI: 10.1039/c4cp04517c] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Regiospecific star-sphere assemblies show enhanced SERS intensity and electric field at the interparticle junction as well as at locations between the nanostar tips.
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Affiliation(s)
| | - Roney Thomas
- Department of Materials Science and Engineering
- Rutgers University
- Piscataway NJ
- USA
| | - Laura Fabris
- Department of Materials Science and Engineering
- Rutgers University
- Piscataway NJ
- USA
- Institute for Advanced Materials Devices and Nanotechnology
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63
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Lee S, Song HD, Yang YI, Kim GP, Choi I, Yi J. Solution based, on chip direct growth of three-dimensionally wrinkled gold nanoparticles for a SERS active substrate. Chem Commun (Camb) 2015; 51:213-6. [DOI: 10.1039/c4cc07818g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work reports a solution-based method for on chip growth of SERS active wrinkled gold nanoparticles.
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Affiliation(s)
- Suseung Lee
- Institute of Chemical Processes
- School of Chemical and Biological Engineering
- College of Engineering
- Seoul National University
- Seoul
| | - Hyeon Don Song
- Institute of Chemical Processes
- School of Chemical and Biological Engineering
- College of Engineering
- Seoul National University
- Seoul
| | - Young In Yang
- Institute of Chemical Processes
- School of Chemical and Biological Engineering
- College of Engineering
- Seoul National University
- Seoul
| | - Gil-Pyo Kim
- Institute of Chemical Processes
- School of Chemical and Biological Engineering
- College of Engineering
- Seoul National University
- Seoul
| | - Inhee Choi
- Department of Life Science
- University of Seoul
- Seoul 130-743
- Republic of Korea
| | - Jongheop Yi
- Institute of Chemical Processes
- School of Chemical and Biological Engineering
- College of Engineering
- Seoul National University
- Seoul
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64
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Lai F, Borca-Tasciuc T, Iruvanti S, Plawsky J. On the sintering of gold nanorod assemblies towards continuous networks. RSC Adv 2015. [DOI: 10.1039/c5ra07900d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We present an approach for the coalescence and sintering of a gold nanorod assembly by thermal annealing at low temperatures. The sintering process initially takes place locally, resulting in aggregates which eventually grow into a continuous, percolating network structure.
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Affiliation(s)
- Fengyuan Lai
- Department of Materials Science and Engineering
- Rensselaer Polytechnic Institute
- Troy
- USA
| | - Theodorian Borca-Tasciuc
- Department of Mechanical
- Aerospace and Nuclear Engineering
- Rensselaer Polytechnic Institute
- Troy
- USA
| | | | - Joel Plawsky
- Department of Chemical and Biological Engineering
- Rensselaer Polytechnic Institute
- Troy
- USA
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65
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Wang Y, He J, Liu C, Chong WH, Chen H. Thermodynamik und Kinetik in der Nanosynthese. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402986] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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66
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Wang Y, He J, Liu C, Chong WH, Chen H. Thermodynamics versus Kinetics in Nanosynthesis. Angew Chem Int Ed Engl 2014; 54:2022-51. [DOI: 10.1002/anie.201402986] [Citation(s) in RCA: 329] [Impact Index Per Article: 32.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Indexed: 12/29/2022]
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67
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68
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Huang H, Wang JH, Jin W, Li P, Chen M, Xie HH, Yu XF, Wang H, Dai Z, Xiao X, Chu PK. Competitive reaction pathway for site-selective conjugation of Raman dyes to hotspots on gold nanorods for greatly enhanced SERS performance. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2014; 10:4012-4019. [PMID: 24947686 DOI: 10.1002/smll.201400860] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2014] [Revised: 05/28/2014] [Indexed: 06/03/2023]
Abstract
Common methods to prepare SERS (surface-enhanced Raman scattering) probes rely on random conjugation of Raman dyes onto metal nanostructures, but most of the Raman dyes are not located at Raman-intense electromagnetic hotspots thus not contributing to SERS enhancement substantially. Herein, a competitive reaction between transverse gold overgrowth and dye conjugation is described to achieve site selective conjugation of Raman dyes to the hotspots (ends) on gold nanorods (GNRs). The preferential overgrowth on the nanorod side surface creates a barrier to prevent the Raman dyes from binding to the side surface except the ends of the GNRs, where the highest SERS enhancement factors are expected. The SERS enhancement observed from this special structure is dozens of times larger than that from conjugates synthesized by conventional methods. This simple and powerful strategy to prepare SERS probes can be extended to different anisotropic metal nanostructures with electromagnetic hotspots and has immense potential in in-depth SERS-based biological imaging and single-molecule detection.
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Affiliation(s)
- Hao Huang
- Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University, Wuhan, 430072, China; Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, HongKong, China
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69
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Kumar J, Thomas R, Swathi RS, Thomas KG. Au nanorod quartets and Raman signal enhancement: towards the design of plasmonic platforms. NANOSCALE 2014; 6:10454-10459. [PMID: 24875403 DOI: 10.1039/c4nr00170b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Quartets of Au nanorods were designed by combining the methodologies of lateral and longitudinal assemblies. A high electric field prevailing at the quartet junctions results in large enhancement in the Raman signals of molecules. FDTD simulations showed that the displacement of the lateral dimers in quartets expands the scope of hot spot distribution.
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Affiliation(s)
- Jatish Kumar
- Photosciences and Photonics, CSIR-National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram 695 019, India
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70
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Wang H, Song X, Liu C, He J, Chong WH, Chen H. Homo- and co-polymerization of polysytrene-block-poly(acrylic acid)-coated metal nanoparticles. ACS NANO 2014; 8:8063-8073. [PMID: 25000121 DOI: 10.1021/nn502084a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Amphiphilic block copolymers such as polystyrene-block-poly(acrylic acid) (PSPAA) give micelles that are known to undergo sphere-to-cylinder shape transformation. Exploiting this polymer property, core-shell nanoparticles coated in PSPAA can be "polymerized" into long chains following the chain-growth polymerization mode. This method is now extended to include a variety of different nanoparticles. A case study on the assembly process was carried out to understand the influence of the PAA block length, the surface ligand, and the size and morphology of the monomer nanoparticles. Shortening the PAA block promotes the reorganization of the amphiphilic copolymer in the micelles, which is essential for assembling large Au nanoparticles. Small Au nanoparticles can be directly "copolymerized" with empty PSPAA micelles into chains. The reaction time, acid quantity, and the [Au nanoparticles]/[PSPAA micelles] concentration ratio played important roles in controlling the sphere-cylinder-vesicle conversion of the PSPAA micelles, giving rise to different kinds of random "copolymers". With this knowledge, a general method is then developed to synthesize homo, random, and block "copolymers", where the basic units include small Au nanoparticles (d = 16 nm), large Au nanoparticles (d = 32 nm), Au nanorods, Te nanowires, and carbon nanotubes. Given the lack of means for assembling nanoparticles, advancing synthetic capabilities is of crucial importance. Our work provides convenient routes for combining nanoparticles into long-chain structures, facilitating rational design of complex nanostructures in the future.
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Affiliation(s)
- Hong Wang
- Division of Chemistry and Biological Chemistry, Nanyang Technological University , Singapore 637371
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71
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Indrasekara ASDS, Meyers S, Shubeita S, Feldman LC, Gustafsson T, Fabris L. Gold nanostar substrates for SERS-based chemical sensing in the femtomolar regime. NANOSCALE 2014; 6:8891-9. [PMID: 24961293 DOI: 10.1039/c4nr02513j] [Citation(s) in RCA: 144] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
We report a novel approach for fabricating gold nanostar-functionalized substrates for highly sensitive surface enhanced Raman spectroscopy (SERS)-based chemical sensing. Gold nanostars immobilized on a gold substrate via a Raman silent organic tether serve as the SERS substrate, and facilitate the chemical sensing of analytes that can either be chemisorbed or physisorbed on the nanostars. Our SERS substrates are capable of detecting chemisorbed 4-mercaptobenzoic acid at a concentration as low as 10 fM with a reproducible SERS enhancement factor of 10(9), and enable the semi-quantitative multiplexed identification of analytes from mixtures in which they have been dissolved in variable stoichiometry. Most importantly, they afford the detection of physisorbed analytes, such as crystal violet, with an excellent signal-to-noise ratio, hence serving as a versatile platform for the chemical identification of in principle any molecular analyte. These characteristics make a strong case for the use of our nanostar-based SERS substrate in practical chemical sensing applications.
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Affiliation(s)
- A S D S Indrasekara
- Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, New Jersey 08854, USA.
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72
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Lawson LS, Chan JW, Huser T. A highly sensitive nanoscale pH-sensor using Au nanoparticles linked by a multifunctional Raman-active reporter molecule. NANOSCALE 2014; 6:7971-7980. [PMID: 24902897 DOI: 10.1039/c3nr06277e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Chemical sensing on the nanoscale has been breaking new ground since the discovery of surface enhanced Raman scattering (SERS). For nanoparticles, controlled particle aggregation is necessary to achieve the largest SERS enhancements. Therefore, aggregating agents such as salts or linker molecules are used in conjunction with chemically sensitive reporters in order to develop robust environmentally sensitive SERS probes. While salt-induced colloidal nanosphere aggregates have produced robust SERS signals, their variability in aggregate size contributes significantly to poor SERS signal reproducibility, which can complicate their use in in vitro cellular studies. Such systems often also lack reproducibility in spectral measurements between different nanoparticle clusters. Preaggregation of colloids via linkers followed by surface functionalization with reporter molecules results in the linker occupying valuable SERS hotspot volume which could otherwise be utilized by additional reporter molecules. Ideally, both functionalities should be obtained from a single molecule. Here, we report the use of 3,5-dimercaptobenzoic acid, a single multifunctional molecule that creates SERS hotspots via the controlled aggregation of nanoparticles, and also reports pH values. We show that 3,5-dimercaptobenzoic acid bound to Au nanospheres results in an excellent pH nanoprobe, producing very robust, and highly reproducible SERS signals that can report pH across the entire physiological range with excellent pH resolution. To demonstrate the efficacy of our novel pH reporters, these probes were also used to image both the particle and pH distribution in the cytoplasm of human induced pluripotent stem cells (hiPSCs).
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Affiliation(s)
- Latevi S Lawson
- NSF Center for Biophotonics Science and Technology, University of California, Davis, Sacramento, California 95817, USA
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73
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Liu TM, Yu J, Chang CA, Chiou A, Chiang HK, Chuang YC, Wu CH, Hsu CH, Chen PA, Huang CC. One-step shell polymerization of inorganic nanoparticles and their applications in SERS/nonlinear optical imaging, drug delivery, and catalysis. Sci Rep 2014; 4:5593. [PMID: 24998932 PMCID: PMC4083277 DOI: 10.1038/srep05593] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Accepted: 06/18/2014] [Indexed: 12/13/2022] Open
Abstract
Surface functionalized nanoparticles have found their applications in several fields including biophotonics, nanobiomedicine, biosensing, drug delivery, and catalysis. Quite often, the nanoparticle surfaces must be post-coated with organic or inorganic layers during the synthesis before use. This work reports a generally one-pot synthesis method for the preparation of various inorganic-organic core-shell nanostructures (Au@polymer, Ag@polymer, Cu@polymer, Fe3O4@polymer, and TiO2@polymer), which led to new optical, magnetic, and catalytic applications. This green synthesis involved reacting inorganic precursors and poly(styrene-alt-maleic acid). The polystyrene blocks separated from the external aqueous environment acting as a hydrophobic depot for aromatic drugs and thus illustrated the integration of functional nanoobjects for drug delivery. Among these nanocomposites, the Au@polymer nanoparticles with good biocompatibility exhibited shell-dependent signal enhancement in the surface plasmon resonance shift, nonlinear fluorescence, and surface-enhanced Raman scattering properties. These unique optical properties were used for dual-modality imaging on the delivery of the aromatic photosensitizer for photodynamic therapy to HeLa cells.
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Affiliation(s)
- Tzu-Ming Liu
- 1] Institute of Biomedical Engineering and Molecular Imaging Center, National Taiwan University, Taipei, 106, Taiwan [2]
| | - Jiashing Yu
- 1] Department of Chemical Engineering, National Taiwan University, Taipei, 106, Taiwan [2]
| | - C Allen Chang
- 1] Department of Biomedical Imaging and Radiological Sciences National Yang-Ming University, Taipei, 112, Taiwan [2] Institute of Biophotonics, National Yang-Ming University, Taipei, 112, Taiwan [3] Biophotonics and Molecular Imaging Research Center (BMIRC), National Yang-Ming University, Taipei, 112, Taiwan
| | - Arthur Chiou
- 1] Institute of Biophotonics, National Yang-Ming University, Taipei, 112, Taiwan [2] Biophotonics and Molecular Imaging Research Center (BMIRC), National Yang-Ming University, Taipei, 112, Taiwan
| | - Huihua Kenny Chiang
- 1] Institute of Biophotonics, National Yang-Ming University, Taipei, 112, Taiwan [2] Biophotonics and Molecular Imaging Research Center (BMIRC), National Yang-Ming University, Taipei, 112, Taiwan [3] Institute of Biomedical Engineering, National Yang-Ming University, Taipei, 112, Taiwan
| | - Yu-Chun Chuang
- National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan
| | - Cheng-Han Wu
- Institute of Biomedical Engineering and Molecular Imaging Center, National Taiwan University, Taipei, 106, Taiwan
| | - Che-Hao Hsu
- Department of Chemical Engineering, National Taiwan University, Taipei, 106, Taiwan
| | - Po-An Chen
- Institute of Biophotonics, National Yang-Ming University, Taipei, 112, Taiwan
| | - Chih-Chia Huang
- 1] Institute of Biophotonics, National Yang-Ming University, Taipei, 112, Taiwan [2] Biophotonics and Molecular Imaging Research Center (BMIRC), National Yang-Ming University, Taipei, 112, Taiwan [3] Department of Applied Chemistry, National University of Kaohsiung, Kaohsiung, 811, Taiwan
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74
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Song J, Duan B, Wang C, Zhou J, Pu L, Fang Z, Wang P, Lim TT, Duan H. SERS-encoded nanogapped plasmonic nanoparticles: growth of metallic nanoshell by templating redox-active polymer brushes. J Am Chem Soc 2014; 136:6838-41. [PMID: 24773367 DOI: 10.1021/ja502024d] [Citation(s) in RCA: 129] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We report a new strategy to synthesize core-shell metal nanoparticles with an interior, Raman tag-encoded nanogap by taking advantage of nanoparticle-templated self-assembly of amphiphilic block copolymers and localized metal precursor reduction by redox-active polymer brushes. Of particular interest for surface-enhanced Raman scattering (SERS) is that the nanogap size can be tailored flexibly, with the sub-2 nm nanogap leading to the highest SERS enhancement. Our results have further demonstrated that surface functionalization of the nanogapped Au nanoparticles with aptamer targeting ligands allows for specific recognition and ultrasensitive detection of cancer cells. The general applicability of this new synthetic strategy, coupled with recent advances in controlled wet-chemical synthesis of functional nanocrystals, opens new avenues to multifunctional core-shell nanoparticles with integrated optical, electronic, and magnetic properties.
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Affiliation(s)
- Jibin Song
- School of Chemical and Biomedical Engineering, Nanyang Technological University , 70 Nanyang Drive, Singapore 637457
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75
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Liu Z, Cheng L, Zhang L, Jing C, Shi X, Yang Z, Long Y, Fang J. Large-area fabrication of highly reproducible surface enhanced Raman substrate via a facile double sided tape-assisted transfer approach using hollow Au-Ag alloy nanourchins. NANOSCALE 2014; 6:2567-2572. [PMID: 24463635 DOI: 10.1039/c3nr05840a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Ideally, a SERS substrate should possess super signal amplification, high uniformity and reproducibility. Up to now, an emphasis on reproducibility and uniformity has been crucial to ensure consistent chemical detection sensitivity across the surface of a SERS substrate. Here we demonstrate a simple and facile double sided tape-assisted transfer method to fabricate surface enhanced Raman scattering (SERS) substrates with prominent performance using hollow Au-Ag alloy nanourchins (HAAA-NUs). Such a large area, closely-packed flat film of the HAAA-NUs with a high density of "hot spots" exhibits a high SERS activity and reproducibility, simultaneously. The AFM-correlated nano-Raman and the point by point scanning of SERS signals verify the excellent spatial uniformity and reproducibility with a low relative standard deviation (RSD) less than 15% using crystal violet as probe molecule at the concentrations of 1 × 10(-8) M and 1 × 10(-10) M. The SERS signals of Sudan dye at a 1 × 10(-8) M concentration also show high reproducibility with a low RSD of 13.8%. This facile protocol presented here could lead to a high quality SERS substrate and open tremendous potential for various applications.
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Affiliation(s)
- Zhen Liu
- State Key Laboratory for Mechanical Behavior of Materials, School of Science, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, P. R. China.
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76
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Fang C, Shapter JG, Voelcker NH, Ellis AV. Electrochemically prepared nanoporous gold as a SERS substrate with high enhancement. RSC Adv 2014. [DOI: 10.1039/c4ra01909a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Gold films were electrochemically etched into nanoporous substrates with tuneable pore sizes down to approximately 2 nm. The SERS enhancement as a result of changes in valley and ligament widths of the nanoporous gold was investigated. Compared to the conventional de-alloyed nano-gold, the etched gold showed a lower limit of detection (2 × 10−9 M vs. 1 × 10−7 M Rhodamine 6G).
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Affiliation(s)
- Cheng Fang
- Flinders Centre for Nanoscale Science and Technology
- School of Chemical and Physical Sciences
- Flinders University
- Adelaide SA5042, Australia
| | - Joseph George Shapter
- Flinders Centre for Nanoscale Science and Technology
- School of Chemical and Physical Sciences
- Flinders University
- Adelaide SA5042, Australia
| | | | - Amanda Vera Ellis
- Flinders Centre for Nanoscale Science and Technology
- School of Chemical and Physical Sciences
- Flinders University
- Adelaide SA5042, Australia
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77
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Boca-Farcau S, Potara M, Simon T, Juhem A, Baldeck P, Astilean S. Folic acid-conjugated, SERS-labeled silver nanotriangles for multimodal detection and targeted photothermal treatment on human ovarian cancer cells. Mol Pharm 2013; 11:391-9. [PMID: 24304361 DOI: 10.1021/mp400300m] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The effectiveness of a therapeutic agent for cancer stands in its ability to reduce and eliminate tumors without harming the healthy tissue nearby. Nanoparticles peripherally conjugated with targeting moieties offer major improvements in therapeutics through site specificity. In this study we demonstrate this approach by targeting the folate receptor of NIH:OVCAR-3 human ovary cancer cell line. Herein we used silver nanotriangles which were biocompatibilized with chitosan (bio)polymer, labeled with para-aminothiophenol (pATP) Raman reporter molecule, and conjugated with folic acid. The nanoparticles conjugation and efficient labeling was investigated by localized surface plasmon resonance (LSPR), zeta potential, and surface-enhanced Raman scattering (SERS) measurements. Conjugated particles were proven to be highly stable in aqueous and cellular medium. The targeted uptake of conjugated nanoparticles by human ovary cancer cells was confirmed by dark field microscopy and scattering spectra of the particles inside cells. Comparative studies revealed specific internalization of the conjugated nanoparticles in comparison with similar bare nanoparticles. Moreover, the SERS identity of the particles was proven to be highly conserved inside cells. Targeted cancer cell treatment conducted by irradiating the nanoparticle-treated cells with a continuous wave-nearinfrared (cw-NIR) laser in resonance with their plasmonic band proved an efficient therapeutic response. By integrating the advantages of multimodal optical imaging and SERS detection with hyperthermia capabilities through site specificity, these nanoparticles can represent a real candidate for personalized medicine.
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Affiliation(s)
- Sanda Boca-Farcau
- Nanobiophotonics and Laser Microspectroscopy Center, Interdisciplinary Research Institute on Bio-Nano-Sciences, Faculty of Physics, Babes-Bolyai University , M. Kogalniceanu Str. 1, 400084 Cluj-Napoca, Romania
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78
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Affiliation(s)
- Michael J. A. Hore
- Center for Neutron Research, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States
| | - Russell J. Composto
- Department
of Materials Science and Engineering and the Laboratory for Research
on the Structure of Matter, University of Pennsylvania, 3231 Walnut
Street, Philadelphia, Pennsylvania 19104, United States
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79
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Shi Z, Wang T, Lin H, Wang X, Ding J, Shao M. Excellent surface-enhanced Raman scattering (SERS) based on AgFeO2 semiconductor nanoparticles. NANOSCALE 2013; 5:10029-33. [PMID: 24056983 DOI: 10.1039/c3nr03460g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A simple hydrothermal method was employed to synthesize AgFeO2 nanoparticles, which were utilized as substrates in SERS detection of Rhodamine 6G and 4-mercaptobenzoic acid. The magnetic properties of the products provided the capability of concentrating analyte molecules under an external magnetic field. The detection in aqueous solution has ensured the uniformity of the SERS signals and the reproducibility of the substrates. It was interesting that the substrates exhibited high SERS activity at Rhodamine 6G concentration of 1 × 10(-7) M with an enhancement factor of 5.1 × 10(5), showing the highest SERS effect for semiconductor substrates, which might be ascribed to the orderly orientation of AgFeO2 nanoparticles under external magnetic field.
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Affiliation(s)
- Zhijie Shi
- Anhui Key Laboratory of Functional Molecular Solids, College of Chemistry and Materials Science, Anhui Normal University, Wuhu 241000, P. R. China.
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80
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Gold Nanotechnology for Targeted Detection and Killing of Multiple Drug Resistant Bacteria from Food Samples. ACTA ACUST UNITED AC 2013. [DOI: 10.1021/bk-2013-1143.ch001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
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81
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Fateixa S, Pinheiro PC, Nogueira HIS, Trindade T. Composite blends of gold nanorods and poly(t-butylacrylate) beads as new substrates for SERS. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 113:100-106. [PMID: 23714187 DOI: 10.1016/j.saa.2013.04.070] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 04/04/2013] [Accepted: 04/14/2013] [Indexed: 06/02/2023]
Abstract
Polymer based composites containing metal nanoparticles are shown to provide new substrates for SERS detection and simultaneously enable the development of new tools for molecular sensing. A very important aspect on the use of hybrid materials relates to the observation of synergistic effects that result from the use of distinct components such as a polymer and metal nanoparticles. We report here the preparation of new SERS substrates made from blends of colloidal Au (nanospheres and nanorods) and PtBA (poly(t-butylacrylate)). The observed SERS enhancement depends on the characteristics of the obtained hybrid material. When compared to the starting Au colloids, the Au/PtBA nanocomposites led to SERS spectra with more intense bands, using 2,2'-dithiodipyridine as molecular probe. The origin of the stronger Raman signal in this case, is possibly due to a combination of events related to the nanocomposite characteristics, including the formation of Au assemblies at the polymer surface due to particle clustering, and the absorption increase in a spectral region closer to the laser excitation wavelength. The strategy described here is a low-cost process with potential for the up-scale fabrication of SERS substrates, namely by using other types of nanocomposites.
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Affiliation(s)
- Sara Fateixa
- Department of Chemistry and CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
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82
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Wang F, Cheng S, Bao Z, Wang J. Anisotropic Overgrowth of Metal Heterostructures Induced by a Site-Selective Silica Coating. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304364] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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83
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Wang F, Cheng S, Bao Z, Wang J. Anisotropic overgrowth of metal heterostructures induced by a site-selective silica coating. Angew Chem Int Ed Engl 2013; 52:10344-8. [PMID: 23939636 DOI: 10.1002/anie.201304364] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2013] [Revised: 07/09/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Feng Wang
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR (China)
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84
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Liu K, Ahmed A, Chung S, Sugikawa K, Wu G, Nie Z, Gordon R, Kumacheva E. In situ plasmonic counter for polymerization of chains of gold nanorods in solution. ACS NANO 2013; 7:5901-5910. [PMID: 23786318 DOI: 10.1021/nn402363p] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Self-assembly of gold nanorods (NRs) in linear, polymer-like chains offers the ability to test and validate theoretical models of molecular polymerization. Practically, NR chains show multiple promising applications in sensing of chemical and biological species. Both areas of research can strongly benefit from the development of a quantitative tool for characterization of the structure of NR chains in the course of self-assembly, based on the change in ensemble-averaged optical properties of plasmonic polymers; however, quantitative correlation between the extinction spectra and the structural characteristics of NR chains has not been reported. Here, we report such a tool by a quantitatively correlating the red shift of the longitudinal surface plasmon band of gold NRs and the average aggregation number of NR chains. The generality of the method is demonstrated for NRs with different aspect ratios, for varying inter-rod distances in the chains, and for varying initial concentrations of NRs in solution. We modeled the extinction spectra of the NR chains by combining the theory of step-growth polymerization with finite-difference time-domain simulations and a resistor-inductor-capacitor model, and obtained agreement between the theoretical and experimental results. In addition to capturing quantitatively the ensemble physics of the polymerization, the proposed 'plasmonic counter' approach provides a real-time cost- and labor-efficient method for the characterization of self-assembly of plasmonic polymers.
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Affiliation(s)
- Kun Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, PR China.
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85
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Gao B, Rozin MJ, Tao AR. Plasmonic nanocomposites: polymer-guided strategies for assembling metal nanoparticles. NANOSCALE 2013; 5:5677-5691. [PMID: 23703218 DOI: 10.1039/c3nr01091k] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Noble metal nanoparticles that support localized surface plasmon resonances (LSPRs) have the unique ability to manipulate and confine light at subwavelength dimensions. Utilizing these capabilities in devices and coatings requires the controlled organization of metal nanoparticles into ordered or hierarchical structures. Polymer grafts can be used as assembly-regulating molecules that bind to the nanoparticle surface and guide nanoparticle organization in solution, at interfaces, and within condensed phases. Here, we present an overview of polymer-directed assembly of plasmonic nanoparticles. We discuss how polymer grafts can be used to control short-range nanoparticle interactions that dictate interparticle gap distance and orientation. We also discuss how condensed polymer grafts can be used to control long-range order within condensed nanoparticle-polymer blends. The assembly of shaped plasmonic nanoparticles that have potential applications in enhanced spectroscopy and optical metamaterials is highlighted. We end with a summary of promising new directions toward the fabrication of plasmonic nanocomposites that are responsive and possess three-dimensional order.
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Affiliation(s)
- Bo Gao
- NanoEngineering Department, University of California, San Diego, 9500 Gilman Dr #0448, La Jolla, CA 92093-0448, USA
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86
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Yang J, Palla M, Bosco FG, Rindzevicius T, Alstrøm TS, Schmidt MS, Boisen A, Ju J, Lin Q. Surface-enhanced Raman spectroscopy based quantitative bioassay on aptamer-functionalized nanopillars using large-area Raman mapping. ACS NANO 2013; 7:5350-9. [PMID: 23713574 PMCID: PMC3915935 DOI: 10.1021/nn401199k] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Surface-enhanced Raman spectroscopy (SERS) has been used in a variety of biological applications due to its high sensitivity and specificity. Here, we report a SERS-based biosensing approach for quantitative detection of biomolecules. A SERS substrate bearing gold-decorated silicon nanopillars is functionalized with aptamers for sensitive and specific detection of target molecules. In this study, TAMRA-labeled vasopressin molecules in the picomolar regime (1 pM to 1 nM) are specifically captured by aptamers on the nanostructured SERS substrate and monitored by using an automated SERS signal mapping technique. From the experimental results, we show concentration-dependent SERS responses in the picomolar range by integrating SERS signal intensities over a scanning area. It is also noted that our signal mapping approach significantly improves statistical reproducibility and accounts for spot-to-spot variation in conventional SERS quantification. Furthermore, we have developed an analytical model capable of predicting experimental intensity distributions on the substrates for reliable quantification of biomolecules. Lastly, we have calculated the minimum needed area of Raman mapping for efficient and reliable analysis of each measurement. Combining our SERS mapping analysis with an aptamer-functionalized nanopillar substrate is found to be extremely efficient for detection of low-abundance biomolecules.
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Affiliation(s)
- Jaeyoung Yang
- Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States
| | - Mirko Palla
- Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
| | - Filippo Giacomo Bosco
- Department of Micro & Nanotechnology, Technical University of Denmark, Lyngby 2800, Denmark
| | - Tomas Rindzevicius
- Department of Micro & Nanotechnology, Technical University of Denmark, Lyngby 2800, Denmark
| | - Tommy Sonne Alstrøm
- Department of Applied Mathematics and Computer Science, Technical University of Denmark, Lyngby 2800, Denmark
| | | | - Anja Boisen
- Department of Micro & Nanotechnology, Technical University of Denmark, Lyngby 2800, Denmark
| | - Jingyue Ju
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
| | - Qiao Lin
- Department of Mechanical Engineering, Columbia University, New York, New York 10027, United States
- Address correspondence to:
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87
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Huang J, Zhu Y, Lin M, Wang Q, Zhao L, Yang Y, Yao KX, Han Y. Site-Specific Growth of Au–Pd Alloy Horns on Au Nanorods: A Platform for Highly Sensitive Monitoring of Catalytic Reactions by Surface Enhancement Raman Spectroscopy. J Am Chem Soc 2013; 135:8552-61. [DOI: 10.1021/ja4004602] [Citation(s) in RCA: 208] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
| | | | - Ming Lin
- Institute of Materials Research
and Engineering, A*STAR (Agency for Science,
Technology and Research), 3 Research Link, Singapore 117602
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88
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Valev VK, Baumberg JJ, Sibilia C, Verbiest T. Chirality and chiroptical effects in plasmonic nanostructures: fundamentals, recent progress, and outlook. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:2517-34. [PMID: 23553650 DOI: 10.1002/adma.201205178] [Citation(s) in RCA: 285] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 01/30/2013] [Indexed: 05/20/2023]
Abstract
Strong chiroptical effects recently reported result from the interaction of light with chiral plasmonic nanostructures. Such nanostructures can be used to enhance the chiroptical response of chiral molecules and could also significantly increase the enantiomeric excess of direct asymmetric synthesis and catalysis. Moreover, in optical metamaterials, chirality leads to negative refractive index and all the promising applications thereof. In this Progress Report, we highlight four different strategies which have been used to achieve giant chiroptical effects in chiral nanostructures. These strategies consecutively highlight the importance of chirality in the nanostructures (for linear and nonlinear chiroptical effects), in the experimental setup and in the light itself. Because, in the future, manipulating chirality will play an important role, we present two examples of chiral switches. Whereas in the first one, switching the chirality of incoming light causes a reversal of the handedness in the nanostructures, in the second one, switching the handedness of the nanostructures causes a reversal in the chirality of outgoing light.
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Affiliation(s)
- Ventsislav K Valev
- Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, UK.
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89
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Xia L, Yang Z, Yin S, Guo W, Li S, Xie W, Huang D, Deng Q, Shi H, Cui H, Du C. Surface enhanced Raman scattering substrate with metallic nanogap array fabricated by etching the assembled polystyrene spheres array. OPTICS EXPRESS 2013; 21:11349-11355. [PMID: 23669991 DOI: 10.1364/oe.21.011349] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A sensitive surface enhanced Raman scattering (SERS) substrate with metallic nanogap array (MNGA) is fabricated by etching of an assembled polystyrene (PS) spheres array, followed by the coating of a metal film. The substrate is reproducible in fabrication and sensitive due to the nanogap coupling resonance (NGCR) enhancement. The NGCR is analyzed with the finite difference time domain (FDTD) method, and the relationship between the gap parameter and the field enhancement is obtained. Experimental measurements of R6G on demonstrate that the enhancement factor (EF) of the MNGA SERS substrate is increased by more than two fold compared with the control sample.
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Affiliation(s)
- Liangping Xia
- Chongqing institute of green and intelligent technology, Chinese Academy of Sciences, Chongqing, 401122, China
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90
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Guerrini L, Graham D. Molecularly-mediated assemblies of plasmonic nanoparticles for Surface-Enhanced Raman Spectroscopy applications. Chem Soc Rev 2013; 41:7085-107. [PMID: 22833008 DOI: 10.1039/c2cs35118h] [Citation(s) in RCA: 245] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In recent years, Surface-Enhanced Raman Spectroscopy (SERS) has experienced a tremendous increase of attention in the scientific community, expanding to a continuously wider range of diverse applications in nanoscience, which can mostly be attributed to significant improvements in nanofabrication techniques that paved the way for the controlled design of reliable and effective SERS nanostructures. In particular, the plasmon coupling properties of interacting nanoparticles are extremely intriguing due to the concentration of enormous electromagnetic enhancements at the interparticle gaps. Recently, great efforts have been devoted to develop new nanoparticle assembly strategies in suspension with improved control over hot-spot architecture and cluster structure, laying the foundation for the full exploitation of their exceptional potential as SERS materials in a wealth of chemical and biological sensing. In this review we summarize in an exhaustive and systematic way the state-of-art of plasmonic nanoparticle assembly in suspension specifically developed for SERS applications in the last 5 years, focusing in particular on those strategies which exploited molecular linkers to engineer interparticle gaps in a controlled manner. Importantly, the novel advances in this rather new field of nanoscience are organized into a coherent overview aimed to rationally describe the different strategies and improvements in the exploitation of colloidal nanoparticle assembly for SERS application to real problems.
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Affiliation(s)
- Luca Guerrini
- Centre for Molecular Nanometrology, WestCHEM, Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
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91
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Zhen SJ, Zhang ZY, Li N, Zhang ZD, Wang J, Li CM, Zhan L, Zhuang HL, Huang CZ. UV light-induced self-assembly of gold nanocrystals into chains and networks in a solution of silver nitrate. NANOTECHNOLOGY 2013; 24:055601. [PMID: 23306830 DOI: 10.1088/0957-4484/24/5/055601] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Controllable assemblies of nanocrystals have attracted considerable interest because they often exhibit unique collective properties that differ from those displayed by individual nanocrystals and bulk samples. Reported approaches to prepare nanocrystal assemblies based on the molecular recognitions of small molecules or biomacromolecules are effective, but often require complicated and time-consuming modification processes of nanocrystals. In this paper, we demonstrate a simple and universal approach to assemble gold nanocrystals (AuNCs) into linear chains and complex networks in aqueous silver nitrate medium under irradiation with UV light without the involvement of any modification step. Due to the strong plasmon resonance coupling verified by finite difference time domain calculation, the assembled structures of AuNCs can be used as excellent surface-enhanced Raman scattering substrates and dark-field light-scattering bioimaging probes.
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Affiliation(s)
- Shu Jun Zhen
- Education Ministry Key Laboratory on Luminescence and Real-Time Analysis, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, People's Republic of China
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92
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Qu H, Lai Y, Niu D, Sun S. Surface-enhanced Raman scattering from magneto-metal nanoparticle assemblies. Anal Chim Acta 2013; 763:38-42. [DOI: 10.1016/j.aca.2012.12.016] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 12/05/2012] [Accepted: 12/09/2012] [Indexed: 10/27/2022]
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93
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Valev VK. Characterization of nanostructured plasmonic surfaces with second harmonic generation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:15454-71. [PMID: 22889193 DOI: 10.1021/la302485c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Because of its high surface and interface sensitivity, the nonlinear optical technique of second harmonic generation (SHG) is a designated method for investigating nanostructured metal surfaces. Indeed, the latter present a high surface-to-volume ratio, but even more importantly, they can exhibit strong near-field enhancements or "hot spots". Hot spots often appear as a result of geometric features on the nanoscale or surface plasmon resonances, which are collective electron oscillations on the surface that, on the nanoscale, can readily be excited by light. In the last 10 years, near-field hot spots have been responsible for dramatic developments in the field of nano-optics. In this Feature Article, the influence of hot spots on the SHG response of nanostructured metal surfaces is discussed on both the microscopic and macroscopic levels. On the microscopic level, the nanostructured metal surfaces were characterized by scanning SHG microscopy, complemented by rigorous numerical simulations of the near-field and of the local electric currents at the fundamental frequency. On the macroscopic level, SHG-circular dichroism and magnetization-induced SHG characterization techniques were employed.
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Affiliation(s)
- V K Valev
- Molecular Imaging and Photonics, KU Leuven, Belgium.
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94
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Saha A, Palmal S, Jana NR. Highly reproducible and sensitive surface-enhanced Raman scattering from colloidal plasmonic nanoparticle via stabilization of hot spots in graphene oxide liquid crystal. NANOSCALE 2012; 4:6649-6657. [PMID: 22992658 DOI: 10.1039/c2nr31035j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Although it is now well recognized that plasmonic gold/silver nanoparticle based aggregates having electromagnetic hot spots are responsible for high sensitivity in surface-enhanced Raman spectroscopy (SERS), the high yield and reproducible production of such nanostructures are challenging and limit their practical application. Here we show a graphene oxide (GO) based approach in generating stable electromagnetic hot spots with high yield from colloidal plasmonic nanoparticles that leads to highly reproducible, stable and sensitive SERS for a wide range of molecules with Raman enhancement factors between 10(8) to 10(11). The liquid crystalline property of dispersed GO directs the Raman probe induced controlled aggregation of plasmonic particles, restricting those aggregates to small and discrete clusters and stabilizing those clusters for longer times-offering the Raman probe induced 'turn on' SERS with high sensitivity and reproducibility. The presented approach is broadly applicable to different types of colloidal plasmonic particles and a wide range of Raman probes and is ideal for SERS based reliable detection of analyte at ultralow concentration.
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Affiliation(s)
- Arindam Saha
- Centre for Advanced Materials, Indian Association for the Cultivation of Science, Kolkata-700032, India
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95
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Canpean V, Astilean S. Temperature effect on the SERS signature of p-aminothiophenol: a new evidence for the production of p,p'-dimercaptoazobenzene on metallic nanostructures. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 96:862-7. [PMID: 22925915 DOI: 10.1016/j.saa.2012.07.120] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Revised: 07/19/2012] [Accepted: 07/22/2012] [Indexed: 05/25/2023]
Abstract
We investigated the effect of the temperature of the plasmonic substrate on the surface enhanced Raman scattering of p-aminothiophenol adsorbed onto a particulate film of gold nanoparticles-decorated polystyrene nanospheres. The results demonstrated that temperature induces important modifications in the overall spectral signature of the charge transfer bands, which are consistent with the generation of a new molecular species. Moreover, the analysis of the shape of the vibrational band at 1078 cm(-1) assigned to the >C-S mode, which is enhanced by electromagnetic mechanism, reveals the co-existence of two distinct bands at 1071 and 1078 cm(-1), assignable to p,p'-dimercaptoazobenzene and p-aminothiophenol, respectively.
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Affiliation(s)
- V Canpean
- Nanobiophotonics Center, Interdisciplinary Research Institute in Bio-Nano-Sciences and Faculty of Physics, Babes-Bolyai University, M. Kogalniceanu 1, 400084 Cluj Napoca, Romania
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96
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Valev VK, De Clercq B, Biris CG, Zheng X, Vandendriessche S, Hojeij M, Denkova D, Jeyaram Y, Panoiu NC, Ekinci Y, Silhanek AV, Volskiy V, Vandenbosch GAE, Ameloot M, Moshchalkov VV, Verbiest T. Distributing the optical near-field for efficient field-enhancements in nanostructures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:OP208-OP272. [PMID: 22761007 DOI: 10.1002/adma.201201151] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Indexed: 06/01/2023]
Affiliation(s)
- V K Valev
- Molecular Electronics and Photonics, INPAC, Katholieke Universiteit Leuven, BE-3001, Belgium.
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97
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Zhang CL, Lv KP, Huang HT, Cong HP, Yu SH. Co-assembly of Au nanorods with Ag nanowires within polymer nanofiber matrix for enhanced SERS property by electrospinning. NANOSCALE 2012; 4:5348-55. [PMID: 22678030 DOI: 10.1039/c2nr30736g] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Gold nanorods (AuNRs) can be successfully co-assembled with Ag nanowires (AgNWs) to form a kind of AuNR-AgNW nanocomposite by electrostatic attraction, in which the AuNRs are arranged along the long axial direction of the AgNWs with a preferential string-like alignment. The assembled AuNR-AgNW nanocomposites are then further embedded within polyvinyl alcohol (PVA) nanofibers by electrospinning, by which both AuNRs and AgNWs can be stabilized and arranged along the axis of polymer nanofibers. When the polymer nanofibers are aligned by collecting on a copper mesh with a woven structure, the AuNR-AgNW nanocomposites assembled within the electrospun nanofibers are also arranged. The influences of the AuNR-AgNW assemblies with different amounts of AuNRs attached on AgNWs on the optical properties and surface enhanced Raman scattering (SERS) enhancement have been investigated. The resulting AuNR-AgNW/PVA electrospun mats show red-shifted and broader absorption bands and higher SERS performances compared with the normal casting films with randomly dispersed AuNRs and AgNWs, or electrospun mats with monometallic components, due to the order alignment of AuNR-AgNW nanocomposites on a large scale.
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Affiliation(s)
- Chuan-Ling Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, P. R. China
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98
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Li X, Zhang Y, Shen ZX, Fan HJ. Highly ordered arrays of particle-in-bowl plasmonic nanostructures for surface-enhanced raman scattering. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:2548-2554. [PMID: 22674732 DOI: 10.1002/smll.201200576] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2012] [Revised: 04/27/2012] [Indexed: 05/28/2023]
Abstract
A highly ordered particle-in-bowl (PIB) nanostructure array is designed and fabricated to achieve large field enhancement for the surface-enhanced Raman scattering (SERS) application. This new type of PIB structure is composed of an Ag particle located at the bottom of an Au bowl, and the two are separated by a precisely controlled nanoscale dielectric layer. The fabrication of the PIB structure is based on the self-assembly of polystyrene spheres and atomic layer deposition (ALD), which allows good control of the metal particle size and gap distance, as well as large-scale ordering. Numerical simulation reveals a high enhancement of the local field at the nanogaps. The SERS performance of the PIB arrays, and the effects of the Ag particle size and the ALD dielectric layer thickness are characterized, results of which are in reasonable agreement with simulation. With Rhodmaine 6G as the probe molecule, the spatially averaged SERS enhancement factor is on the order of 3.8 × 10(7) and the local field enhancement from simulation can be up to 10(8) .
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Affiliation(s)
- Xianglin Li
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
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99
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Wang H, Chen L, Shen X, Zhu L, He J, Chen H. Unconventional Chain-Growth Mode in the Assembly of Colloidal Gold Nanoparticles. Angew Chem Int Ed Engl 2012; 51:8021-5. [DOI: 10.1002/anie.201203088] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2012] [Indexed: 02/06/2023]
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100
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Wang H, Chen L, Shen X, Zhu L, He J, Chen H. Unconventional Chain-Growth Mode in the Assembly of Colloidal Gold Nanoparticles. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203088] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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