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Gong J, Zhang S, Duan G, Qi L, Yang Y. Optical force exerted on the two dimensional transition-metal dichalcogenide coated dielectric particle by Gaussian beam. Heliyon 2023; 9:e14314. [PMID: 36938475 PMCID: PMC10015242 DOI: 10.1016/j.heliyon.2023.e14314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 02/28/2023] [Accepted: 03/01/2023] [Indexed: 03/07/2023] Open
Abstract
Two-dimensional transition-metal dichalcogenide (TMDC) exhibits a series of distinctive optical and electrical characteristics, which make it has a good application prospect in the field of optical manipulation. Based on the Mie theory, we investigate the radiation force exerted on the TMDC wrapped dielectric particle by Gaussian wave. Theoretical calculations show that the optical force spectra exhibit two resonant peaks in the visible region, which are generated by the interband exciton transitions in TMDC. Magnitude and morphology of the excitonic peaks could be modulated effectively by tuning the number of coated TMDC layers. Furthermore, the excitonic peaks transform significantly with particle size due to the variation of coupling strength between the dielectric particle and TMDC coating. The investigation provides potential applications in optical manipulations and light-matter interactions.
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Affiliation(s)
- Jingrui Gong
- State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
| | - Shuo Zhang
- State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
| | - Gaoyan Duan
- State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
| | - Limei Qi
- School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
| | - Yang Yang
- State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
- Corresponding author.
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2
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Kondorskiy AD, Moritaka SS, Lebedev VS. Manifestation of the anisotropic properties of the molecular J-aggregate shell in the optical spectra of plexcitonic nanoparticles. OPTICS EXPRESS 2022; 30:4600-4614. [PMID: 35209693 DOI: 10.1364/oe.446184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 01/20/2022] [Indexed: 06/14/2023]
Abstract
The theoretical studies of light absorption and scattering spectra of the plexcitonic two-layer triangular nanoprisms and three-layer nanospheres are reported. The optical properties of such metal-organic core-shell and core-double-shell nanostructures were previously explained within the framework of pure isotropic models for describing their outer excitonic shell. In this work, we show that the anisotropy of the excitonic shell permittivity can drastically affect the optical spectra of such hybrid nanostructures. This fact is confirmed by directly comparing our theory with some available experimental data, which cannot be treated using conventional isotropic shell models. We have analyzed the influence of the shell anisotropy on the optical spectra and proposed a type of hybrid nanostructure that seems the most convenient for experimental observation of the effects associated with the anisotropy of the excitonic shell. A strong dependence of the anisotropic properties of the J-aggregate shell on the material of the intermediate spacer layer is demonstrated. This allows proposing a new way to effectively control the optical properties of metal-organic nanostructures by selecting the spacer material. Our results extend the understanding of physical effects in optics of plexcitonic nanostructures to more complex systems with the anisotropic and multi-excitonic properties of their molecular aggregate shell.
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3
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Godfrey IJ, Dent AJ, Parkin IP, Maenosono S, Sankar G. Following the Formation of Silver Nanoparticles Using In Situ X-ray Absorption Spectroscopy. ACS OMEGA 2020; 5:13664-13671. [PMID: 32566831 PMCID: PMC7301364 DOI: 10.1021/acsomega.0c00697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Accepted: 05/22/2020] [Indexed: 06/11/2023]
Abstract
The formation of silver and Au@Ag core@shell nanoparticles via reduction of AgNO3 by trisodium citrate was followed using in situ X-ray absorption near-edge structure (XANES) spectroscopy and time-resolved UV-visible (UV-vis) spectroscopy. The XANES data were analyzed through linear combination fitting, and the reaction kinetics were found to be consistent with first-order behavior with respect to silver cations. For the Au@Ag nanoparticles, the UV-vis data of a lab-scale reaction showed a gradual shift in dominance between the gold- and silver-localized surface plasmon absorbance bands. Notably, throughout much of the reaction, distinct gold and silver contributions to the UV-vis spectra were observed; however, in the final product, the contributions were not distinct.
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Affiliation(s)
- Ian J. Godfrey
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
- School
of Materials Science, Japan Advanced Institute
of Science and Technology, 1-1 Asahidai, Nomi City, Ishikawa 923-1292, Japan
| | - Andrew J. Dent
- Diamond
Light Source, Harwell
Science and Innovation Campus, Didcot, Oxfordshire OX11 0DE, U.K.
| | - Ivan P. Parkin
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
| | - Shinya Maenosono
- School
of Materials Science, Japan Advanced Institute
of Science and Technology, 1-1 Asahidai, Nomi City, Ishikawa 923-1292, Japan
| | - Gopinathan Sankar
- Department
of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, U.K.
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4
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Marcheselli J, Chateau D, Lerouge F, Baldeck P, Andraud C, Parola S, Baroni S, Corni S, Garavelli M, Rivalta I. Simulating Plasmon Resonances of Gold Nanoparticles with Bipyramidal Shapes by Boundary Element Methods. J Chem Theory Comput 2020; 16:3807-3815. [PMID: 32379444 PMCID: PMC7584360 DOI: 10.1021/acs.jctc.0c00269] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
![]()
Computational
modeling and accurate simulations of localized surface
plasmon resonance (LSPR) absorption properties are reported for gold
nanobipyramids (GNBs), a class of metal nanoparticle that features
highly tunable, geometry-dependent optical properties. GNB bicone
models with spherical tips performed best in reproducing experimental
LSPR spectra while the comparison with other geometrical models provided
a fundamental understanding of base shapes and tip effects on the
optical properties of GNBs. Our results demonstrated the importance
of averaging all geometrical parameters determined from transmission
electron microscopy images to build representative models of GNBs.
By assessing the performances of LSPR absorption spectra simulations
based on a quasi-static approximation, we provided an applicability
range of this approach as a function of the nanoparticle size, paving
the way to the theoretical study of the coupling between molecular
electron densities and metal nanoparticles in GNB-based nanohybrid
systems, with potential applications in the design of nanomaterials
for bioimaging, optics and photocatalysis.
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Affiliation(s)
- Jacopo Marcheselli
- SISSA-Scuola Internazionale Superiore di Studi Avanzati, Via Bonomea 265, 34136 Trieste, Italy
| | - Denis Chateau
- Laboratoire de Chimie UMR 5182, CNRS, Université Lyon 1, Univ Lyon, Ens de Lyon, F-69342 Lyon, France
| | - Frederic Lerouge
- Laboratoire de Chimie UMR 5182, CNRS, Université Lyon 1, Univ Lyon, Ens de Lyon, F-69342 Lyon, France
| | - Patrice Baldeck
- Laboratoire de Chimie UMR 5182, CNRS, Université Lyon 1, Univ Lyon, Ens de Lyon, F-69342 Lyon, France
| | - Chantal Andraud
- Laboratoire de Chimie UMR 5182, CNRS, Université Lyon 1, Univ Lyon, Ens de Lyon, F-69342 Lyon, France
| | - Stephane Parola
- Laboratoire de Chimie UMR 5182, CNRS, Université Lyon 1, Univ Lyon, Ens de Lyon, F-69342 Lyon, France
| | - Stefano Baroni
- SISSA-Scuola Internazionale Superiore di Studi Avanzati, Via Bonomea 265, 34136 Trieste, Italy
| | - Stefano Corni
- Dipartimento di Scienze Chimiche, Università di Padova, 35131 Padova, Italy.,Istituto di Nanoscienze, Consiglio Nazionale delle Ricerche CNR-NANO, 41125 Modena, Italy
| | - Marco Garavelli
- Dipartimento di Chimica Industriale "Toso Montanari", Università degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
| | - Ivan Rivalta
- Laboratoire de Chimie UMR 5182, CNRS, Université Lyon 1, Univ Lyon, Ens de Lyon, F-69342 Lyon, France.,Dipartimento di Chimica Industriale "Toso Montanari", Università degli Studi di Bologna, Viale del Risorgimento 4, I-40136 Bologna, Italy
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5
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Rasskazov IL, Moroz A, Carney PS. Electromagnetic energy in multilayered spherical particles. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2019; 36:1591-1601. [PMID: 31503856 DOI: 10.1364/josaa.36.001591] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 07/31/2019] [Indexed: 06/10/2023]
Abstract
We obtain exact analytic expressions for (i) the electromagnetic energy radial density within and outside a multilayered sphere and (ii) the total electromagnetic energy stored within its core and each of its shells. Explicit expressions for the special cases of lossless core and shell are also provided. The general solution is based on the compact recursive transfer-matrix method, and its validity includes also magnetic media. The theory is illustrated on examples of electric field enhancement within various metallo-dielectric silica-gold multilayered spheres. The user-friendly MATLAB code, which includes the theoretical treatment, is available as a supplement to the paper.
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6
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Tang Y, Yu X, Pan H, Chen J, Audit B, Argoul F, Zhang S, Xu J. Numerical Study of Novel Ratiometric Sensors Based on Plasmon-Exciton Coupling. APPLIED SPECTROSCOPY 2017; 71:2377-2384. [PMID: 28509571 DOI: 10.1177/0003702817706979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We numerically studied the optical properties of spherical nanostructures made of an emitter core coated by a silver shell through the generalized Mie theory. When there is a strong coupling between the localized surface plasmon in the metallic shell and the emitter exciton in the core, the extinction spectra exhibit two peaks. Upon adsorption of analytes on these core-shell nanostructures, the intensities of the two peaks change with opposite trends. This property makes them potential sensitive ratiometric sensors. Molecule adsorption on these nanostructures can be quantified through a very simple optical configuration likely resulting in a much faster acquisition time compared with systems based on the traditional metal nanoparticle surface plasmon resonance (SPR) biosensors.
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Affiliation(s)
- Yuankai Tang
- 1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China
| | - Xiantong Yu
- 1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China
| | - Haifeng Pan
- 1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China
| | - Jinquan Chen
- 1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China
| | - Benjamin Audit
- 2 Univ Lyon, Ens de Lyon, Université Claude Bernard Lyon 1, CNRS, Laboratoire de Physique, Lyon, France
| | | | - Sanjun Zhang
- 1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China
- 3 NYU-ECNU Institute of Physics at NYU Shanghai, 3663 Zhongshan Road North, Shanghai, China
| | - Jianhua Xu
- 1 State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, China
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7
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Hu Y, Zhang AQ, Li HJ, Qian DJ, Chen M. Synthesis, Study, and Discrete Dipole Approximation Simulation of Ag-Au Bimetallic Nanostructures. NANOSCALE RESEARCH LETTERS 2016; 11:209. [PMID: 27094823 PMCID: PMC4837194 DOI: 10.1186/s11671-016-1435-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Accepted: 04/14/2016] [Indexed: 05/19/2023]
Abstract
Water-soluble Ag-Au bimetallic nanostructures were prepared via co-reduction and seed-mediated growth routes employing poly-(4-styrenesulfonic acid-co-maleic acid) (PSSMA) as both a reductant and a stabilizer. Ag-Au alloy nanoparticles were obtained by the co-reduction of AgNO3 and HAuCl4, while Ag-Au core-shell nanostructures were prepared through seed-mediated growth using PSSMA-Au nanoparticle seeds in a heated AgNO3 solution. The optical properties of the Ag-Au alloy and core-shell nanostructures were studied, and the growth mechanism of the bimetallic nanoparticles was investigated. Plasmon resonance bands in the range 422 to 517 nm were observed for Ag-Au alloy nanoparticles, while two plasmon resonances were found in the Ag-Au core-shell nanostructures. Furthermore, discrete dipole approximation theoretical simulation was used to assess the optical property differences between the Ag-Au alloy and core-shell nanostructures. Composition and morphology studies confirmed that the synthesized materials were Ag-Au bimetallic nanostructures.
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Affiliation(s)
- Yang Hu
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China
| | - An-Qi Zhang
- Department of Materials Science, Fudan University, Shanghai, 200433, P. R. China
| | - Hui-Jun Li
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China
| | - Dong-Jin Qian
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China
| | - Meng Chen
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai, 200433, P. R. China.
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8
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Marinica DC, Aizpurua J, Borisov AG. Quantum effects in the plasmon response of bimetallic core-shell nanostructures. OPTICS EXPRESS 2016; 24:23941-23956. [PMID: 27828228 DOI: 10.1364/oe.24.023941] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report a quantum mechanical study of the plasmonic response of bimetallic spherical core/shell nanoparticles. The systems comprise up to 104 electrons and their optical response is addressed with Time Dependent Density Functional Theory calculations. These quantum results are compared with classical electromagnetic calculations for core/shell systems formed by Al/Na, Al/Au and Ag/Na, as representative examples of bimetallic systems. We show that for shell widths in the nanometer range, the system cannot be described as a simple stack of two metals. The finite size effect and the transition layer formed between the core and the shell strongly modify the optical properties of the compound nanoparticle. In particular this configuration leads to a frequency shift of the plasmon resonance with shell character and an increased plasmon decay into electron-hole pairs which eventually quenches this resonance for very thin shells. This effect is difficult to capture with a classical theory even upon adjustment of the parameters of a combination of metallic dielectric functions.
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9
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Shibata H, Imakita K, Fujii M. Fabrication of a core–shell–shell particle with a quarter-wave thick shell and its optical properties. RSC Adv 2014. [DOI: 10.1039/c4ra04924a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In the present work, core–shell–shell particles with quarter-wave thick shells have been synthesized using chemical solution processes for the first time and the optical properties are discussed both theoretically and experimentally.
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Affiliation(s)
- Hiroki Shibata
- Department of Electrical and Electronic Engineering
- Graduate School of Engineering
- Kobe University
- Kobe 657-8501, Japan
| | - Kenji Imakita
- Department of Electrical and Electronic Engineering
- Graduate School of Engineering
- Kobe University
- Kobe 657-8501, Japan
| | - Minoru Fujii
- Department of Electrical and Electronic Engineering
- Graduate School of Engineering
- Kobe University
- Kobe 657-8501, Japan
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10
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Derom S, Berthelot A, Pillonnet A, Benamara O, Jurdyc AM, Girard C, Colas des Francs G. Metal enhanced fluorescence in rare earth doped plasmonic core-shell nanoparticles. NANOTECHNOLOGY 2013; 24:495704. [PMID: 24231223 DOI: 10.1088/0957-4484/24/49/495704] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We theoretically and numerically investigate metal enhanced fluorescence of plasmonic core-shell nanoparticles doped with rare earth (RE) ions. Particle shape and size are engineered to maximize the average enhancement factor (AEF) of the overall doped shell. We show that the highest enhancement (11 in the visible and 7 in the near-infrared) is achieved by tuning either the dipolar or the quadrupolar particle resonance to the rare earth ion's excitation wavelength. Additionally, the calculated AEFs are compared to experimental data reported in the literature, obtained in similar conditions (plasmon mediated enhancement) or when a metal-RE energy transfer mechanism is involved.
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Affiliation(s)
- S Derom
- Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), UMR 6303 CNRS-Université de Bourgogne, 9 Avenue A. Savary, BP 47 870, F-21078 Dijon, France
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11
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Boulais E, Lachaine R, Meunier M. Plasma mediated off-resonance plasmonic enhanced ultrafast laser-induced nanocavitation. NANO LETTERS 2012; 12:4763-9. [PMID: 22845691 DOI: 10.1021/nl302200w] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The generation of nanobubbles around plasmonic nanostructures is an efficient approach for imaging and therapy, especially in the field of cancer research. We show a novel method using infrared femtosecond laser that generates ≈800 nm bubbles around off-resonance gold nanospheres using 200 mJ/cm(2) 45 fs pulses. We present experimental and theoretical work that demonstrate that the nanobubble formation results from the generation of a nanoscale plasma around the particle due to the enhanced near-field rather than from the heating of the particle. Energy absorbed in the nanoplasma is indeed more than 11 times the energy absorbed in the particle. When compared to the usual approach that uses nanosecond laser to induce the extreme heating of in-resonance nanoparticles to initiate bubble formation, our off-resonance femtosecond technique is shown to bring many advantages, including avoiding the particles fragmentation, working in the optical window of biological material and using the deposited energy more efficiently.
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Affiliation(s)
- Etienne Boulais
- Laser Processing and Plasmonics Laboratory, Engineering Physics Department, École Polytechnique de Montréal, Montréal, Québec H3C 3A7, Canada
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12
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Chuntonov L, Bar-Sadan M, Houben L, Haran G. Correlating electron tomography and plasmon spectroscopy of single noble metal core-shell nanoparticles. NANO LETTERS 2012; 12:145-150. [PMID: 22168793 DOI: 10.1021/nl204125d] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The 3D structure reconstruction of gold core-silver shell nanoparticles by electron tomography is combined with optical dark-field spectroscopy. Electron tomography allows segmentation of the particles into core and shell subvolumes and facilitates avoiding Bragg diffraction artifacts inherent in 2D images. This advantage proves essential for accurate correlation of plasmon spectra and structure. We find that for the nanoparticles of near-spherical shape studied here the plasmon resonances depend on the relative size of the core and shell, rather than on their exact shapes and concentricity. A remarkable dependence of the spectral shape on the permittivity of the surrounding medium is also demonstrated, suggesting that core-shell nanoparticles can be used as ratiometric sensors with a very high dynamic range.
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Affiliation(s)
- Lev Chuntonov
- Department of Chemical Physics, Weizmann Institute of Science, 76100, Rehovot, Israel
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13
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Xiao M, Chen H, Ming T, Shao L, Wang J. Plasmon-modulated light scattering from gold nanocrystal-decorated hollow mesoporous silica microspheres. ACS NANO 2010; 4:6565-6572. [PMID: 20939510 DOI: 10.1021/nn101804v] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Localized surface plasmon resonances of noble metal nanocrystals are powerful in enhancing a variety of linear and nonlinear optical signals and photorelated processes. Here we demonstrate the plasmonic enhancement of the light scattering from hollow mesoporous silica microspheres by attaching a dense layer of gold nanocrystals onto the outer surface of the microspheres. The attachment of gold nanocrystals induces both the shift and intensity increase in the resonant scattering peaks of the microspheres. The spectral region of the resonant scattering enhancement can be controlled by using gold nanocrystals with different plasmon resonance wavelengths. The spectral region of the enhancement is independent of the microsphere diameter. The scattering enhancement factor ranges from 20 to 130, depending on the plasmonic properties and surface coverage of the attached gold nanocrystals. The systematic evolution of the scattering spectra of the individual microspheres is also revealed by chemically etching away the attached gold nanocrystals gradually.
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Affiliation(s)
- Manda Xiao
- Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong SAR, China
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14
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Höflich K, Gösele U, Christiansen S. Near-field investigations of nanoshell cylinder dimers. J Chem Phys 2009; 131:164704. [DOI: 10.1063/1.3231870] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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15
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Yang Z, Li Y, Li Z, Wu D, Kang J, Xu H, Sun M. Surface enhanced Raman scattering of pyridine adsorbed on Au@Pd core/shell nanoparticles. J Chem Phys 2009; 130:234705. [PMID: 19548748 DOI: 10.1063/1.3153917] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Surface enhanced Raman scattering (SERS) of pyridine adsorbed on Au@Pd core/shell nanoparticles has been investigated theoretically with quantum chemical method, generalized Mie theory and three-dimensional finite-difference time domain (3D-FDTD) method. We first studied the influence of the coated Pd on the electronic structure of Au nanoparticle, and compared the electronic structure of Au(20) cluster with that of Au(10)Pd(10) (core/shell) cluster. Second, we studied SERS spectroscopy of pyridine on Au@Pd core/shell nanoparticles, which revealed the rate of static chemical enhancement and electromagnetic enhancement in the experimental reports. Third, the influence of the Pd shell thickness to the optical absorption of Au@Pd core/shell nanoparticles was investigated with generalized Mie theory. Fourth, we studied the influence of the shell thickness to the local electric field enhancement with 3D-FDTD method. The theoretical results reveal that the static chemical enhancement and electromagnetic enhancement are in the order of 10 and 10(3), respectively. These theoretical studies promote the deeper understanding of the electronic structure and optical absorption properties of Au@Pd, and the mechanisms for SERS of molecule adsorbed on Au@Pd.
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Affiliation(s)
- Zhilin Yang
- Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603-146, Beijing 100190, People's Republic of China
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16
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Nayak MK, Ghosh SK. Optical properties of bimetallic nanospheres: Effect of diffuse electron density profiles at the boundary surfaces. J Chem Phys 2009; 130:204702. [DOI: 10.1063/1.3133332] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Zhao K, Xu H, Gu B, Zhang Z. One-dimensional arrays of nanoshell dimers for single molecule spectroscopy via surface-enhanced raman scattering. J Chem Phys 2006; 125:081102. [PMID: 16964992 DOI: 10.1063/1.2229204] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The optical properties of one-dimensional arrays of metal nanoshell dimers are studied systematically using the T-matrix method based on Mie theory, within the context of surface enhanced Raman scattering (SERS). It is shown that the local electromagnetic enhancement can be as high as approximately 4.5 x 10(13) for nanoshell dimer arrays with optimal geometry, and sensitive tunability in the resonant frequency can be gained by varying the geometrical parameters, making such structures appealing templates for SERS measurements with single molecule sensitivity. The extraordinarily high enhancement is attributed to a collective photonic effect constructively superposed onto the intrinsic enhancement associated with an isolated nanoshell dimer.
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Affiliation(s)
- Ke Zhao
- Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN 37996, USA
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18
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Liz-Marzán LM. Tailoring surface plasmons through the morphology and assembly of metal nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:32-41. [PMID: 16378396 DOI: 10.1021/la0513353] [Citation(s) in RCA: 799] [Impact Index Per Article: 44.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Metal nanoparticles can be used as building blocks for the formation of nanostructured materials. For the design of materials with specific (optical) properties, several approaches can be followed, even when starting from the very same basic units. In this article, a survey is provided of the optical properties of noble metal nanoparticles, specifically gold, silver, and their combinations, prepared in solution through colloid chemical methods. The optical properties are shown to be mainly influenced by the surface plasmon resonance of conduction electrons, the frequency of which is not only determined by the nature of the metal but also by a number of other parameters, such as particle size and shape, the presence of a capping shell on the particle surface, or the dielectric properties of the surrounding medium. Recent results showing how these various parameters affect the optical properties are reviewed. The results highlight the high degree of control that can now be achieved through colloid chemical synthesis.
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Affiliation(s)
- Luis M Liz-Marzán
- Departamento de Química Física, Universidade de Vigo, 36310 Vigo, Spain.
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19
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20
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Rodríguez-González B, Burrows A, Watanabe M, Kiely CJ, Liz Marzán LM. Multishell bimetallic AuAg nanoparticles: synthesis, structure and optical properties. ACTA ACUST UNITED AC 2005. [DOI: 10.1039/b500556f] [Citation(s) in RCA: 246] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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21
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Srnová-Sloufová I, Vlcková B, Bastl Z, Hasslett TL. Bimetallic (Ag)Au nanoparticles prepared by the seed growth method: two-dimensional assembling, characterization by energy dispersive X-ray analysis, X-ray photoelectron spectroscopy, and surface enhanced raman spectroscopy, and proposed mechanism of growth. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:3407-15. [PMID: 15875875 DOI: 10.1021/la0302605] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Layered core-shell bimetallic silver-gold nanoparticles were prepared by overdeposition of Au over Ag seeds by the seed-growth method using tetrachloroauric acid, with hydroxylamine hydrochloride as the reductant. The effects of pH, reduction rate, and seeding conditions on the morphology and surface plasmon extinction of the bimetallic nanoparticles were investigated. Nanoparticles prepared by a rapid reduction in the neutral ambient and assembled into two-dimensional nanoparticulate films by adsorption of 2,2'-bipyridine were characterized by energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, surface-enhanced Raman scattering spectroscopy, and transmission electron microscopy. The results are consistent with Ag core and Ag/Au-alloyed shell composition of the nanoparticles. Evidence of the presence of Ag on the surface of the nanoparticles, of enrichment of the Ag/Au alloy shell by Ag toward or at the nanoparticle surface, and of modification of the nanoparticle surface by adsorbed chlorides is also provided. Reduction of the size of the Ag seeds, alloying of Ag and Au in the shell of the nanoparticles, and modification of their surfaces by adsorbed chlorides are tentatively attributed to positive charging of the nanoparticles during the electrocatalytic overdeposition of Au over Ag seeds.
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Affiliation(s)
- Ivana Srnová-Sloufová
- Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, 162 06 Prague 6, Czech Republic
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Hodak JH, Henglein A, Giersig M, Hartland GV. Laser-Induced Inter-Diffusion in AuAg Core−Shell Nanoparticles. J Phys Chem B 2000. [DOI: 10.1021/jp002438r] [Citation(s) in RCA: 289] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- José H. Hodak
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670
| | - Arnim Henglein
- Notre Dame Radiation Laboratory, Notre Dame, Indiana 46556-5670
| | | | - Gregory V. Hartland
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670
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Kreibig U, Gartz M, Hilger A, Hövel H. Optical investigations of surfaces and interfaces of metal clusters. ADVANCES IN METAL AND SEMICONDUCTOR CLUSTERS 1998. [DOI: 10.1016/s1075-1629(98)80013-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Neuendorf R, Quinten M, Kreibig U. Optical bistability of small heterogeneous clusters. J Chem Phys 1996. [DOI: 10.1063/1.471296] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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