共查询到20条相似文献,搜索用时 15 毫秒
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3D Nanostar Dimers with a Sub‐10‐nm Gap for Single‐/Few‐Molecule Surface‐Enhanced Raman Scattering 下载免费PDF全文
Manohar Chirumamilla Andrea Toma Anisha Gopalakrishnan Gobind Das Remo Proietti Zaccaria Roman Krahne Eliana Rondanina Marco Leoncini Carlo Liberale Francesco De Angelis Enzo Di Fabrizio 《Advanced materials (Deerfield Beach, Fla.)》2014,26(15):2353-2358
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Simultaneous measurement of surface‐enhanced Raman scattering (SERS) and localized surface plasmon resonance (LSPR) in nanoparticle dimers presents outstanding opportunities in molecular identification and in the elucidation of physical properties, such as the size, distance, and deformation of target species. SERS–LSPR instrumentation exists and has been used under limited conditions, but the extraction of SERS and LSPR readouts from a single measurement is still a challenge. Herein, the extraction of LSPR spectra from SERS signals is reported and a tool for measuring the interparticle distance from Raman enhancement data by the standardization of the SERS signal is proposed. The SERS nanoruler mechanism incorporates two important aspects (the LSPR scattering peak shift and the Raman shift for measuring interparticle distance), and signifies their exact one‐to‐one correspondence after spectral correction. The developed methodology is applied to calculate the interparticle distance between nanoparticle dimers from SERS signals, to detect and quantify DNA at the single‐molecule level in a base‐pair‐specific manner. It is also shown that the SERS nanoruler concept can be used in structural analysis for the specific detection of the interaction of immunoglobulin G (IgG) with its target from bianalyte Raman signals with identical shaping at single‐molecule resolution. The SERS profile shaping approach not only offers a new detection mechanism for single molecules, but also has excellent potential for studying protein interactions and the intracellular detection of mRNA. 相似文献
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Plasmonic Heterodimers with Binding Site‐Dependent Hot Spot for Surface‐Enhanced Raman Scattering 下载免费PDF全文
A novel plasmonic heterodimer nanostructure with a controllable self‐assembled hot spot is fabricated by the conjugation of individual Au@Ag core–shell nanocubes (Au@Ag NCs) and varisized gold nanospheres (GNSs) via the biotin–streptavidin interaction from the ensemble to the single‐assembly level. Due to their featured configurations, three types of heterogeneous nanostructures referred to as Vertice, Vicinity, and Middle are proposed and a single hot spot forms between the nanocube and nanosphere, which exhibits distinct diversity in surface plasmon resonance effect. Herein, the calculated surface‐enhanced Raman scattering enhancement factors of the three types of heterodimers show a narrow distribution and can be tuned in orders of magnitude by controlling the size of GNSs onto individual Au@Ag NCs. Particularly, the Vertice heterodimer with unique configuration can provide extraordinary enhancement of the electric field for the single hot spot region due to the collaborative interaction of lightning rod effect and interparticle plasmon coupling effect. This established relationship between the architecture and the corresponding optical properties of the heterodimers provides the basis for creating controllable platforms which can be exploited in the applications of plasmonic devices, electronics, and biodetection. 相似文献
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Nanoplasmonics: A Deformable Nanoplasmonic Membrane Reveals Universal Correlations Between Plasmon Resonance and Surface Enhanced Raman Scattering (Adv. Mater. 26/2014) 下载免费PDF全文
Minhee Kang Jae‐Jun Kim Young‐Jae Oh Sang‐Gil Park Ki‐Hun Jeong 《Advanced materials (Deerfield Beach, Fla.)》2014,26(26):4509-4509
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Zhendong Zhu Benfeng Bai Huigao Duan Haosu Zhang Mingqian Zhang Oubo You Qunqing Li Qiaofeng Tan Jia Wang Shoushan Fan Guofan Jin 《Small (Weinheim an der Bergstrasse, Germany)》2014,10(8):1603-1611
Plasmonic nanostructures separated by nanogaps enable strong electromagnetic‐field confinement on the nanoscale for enhancing light‐matter interactions, which are in great demand in many applications such as surface‐enhanced Raman scattering (SERS). A simple M‐shaped nanograting with narrow V‐shaped grooves is proposed. Both theoretical and experimental studies reveal that the electromagnetic field on the surface of the M grating can be pronouncedly enhanced over that of a grating without such grooves, due to field localization in the nanogaps formed by the narrow V grooves. A technique based on room‐temperature nanoimprinting lithography and anisotropic reactive‐ion etching is developed to fabricate this device, which is cost‐effective, reliable, and suitable for fabricating large‐area nanostructures. As a demonstration of the potential application of this device, the M grating is used as a SERS substrate for probing Rhodamine 6G molecules. Experimentally, an average SERS enhancement factor as high as 5×108 has been achieved, which verifies the greatly enhanced light–matter interaction on the surface of the M grating over that of traditional SERS surfaces. 相似文献
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3D Cross‐Point Plasmonic Nanoarchitectures Containing Dense and Regular Hot Spots for Surface‐Enhanced Raman Spectroscopy Analysis 下载免费PDF全文
Jae Won Jeong Md Masud Parvez Arnob Kwang‐Min Baek Seung Yong Lee Wei‐Chuan Shih Yeon Sik Jung 《Advanced materials (Deerfield Beach, Fla.)》2016,28(39):8695-8704
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Plasmonics: Plasmon‐Enhanced Sub‐Wavelength Laser Ablation: Plasmonic Nanojets (Adv. Mater. 10/2012)
Ventsislav K. Valev Denitza Denkova Xuezhi Zheng Arseniy I. Kuznetsov Carsten Reinhardt Boris N. Chichkov Gichka Tsutsumanova Edward J. Osley Veselin Petkov Ben De Clercq Alejandro V. Silhanek Yogesh Jeyaram Vladimir Volskiy Paul A. Warburton Guy A. E. Vandenbosch Stoyan Russev Oleg A. Aktsipetrov Marcel Ameloot Victor V. Moshchalkov Thierry Verbiest 《Advanced materials (Deerfield Beach, Fla.)》2012,24(10):OP28-OP28
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Silver‐Nanorod Bundles: A Hierarchically Ordered Array of Silver‐Nanorod Bundles for Surface‐Enhanced Raman Scattering Detection of Phenolic Pollutants (Adv. Mater. 24/2016) 下载免费PDF全文
Chuhong Zhu Guowen Meng Peng Zheng Qing Huang Zhongbo Li Xiaoye Hu Xiujuan Wang Zhulin Huang Fadi Li Nianqiang Wu 《Advanced materials (Deerfield Beach, Fla.)》2016,28(24):4870-4870
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Qi Li Yuanyuan Jiang Rongcheng Han Xiaolan Zhong Siyun Liu Zhi‐Yuan Li Yinlin Sha Dongsheng Xu 《Small (Weinheim an der Bergstrasse, Germany)》2013,9(6):927-932
Molecular imaging techniques based on surface‐enhanced Raman scattering (SERS) face a lack of reproducibility and reliability, thus hampering its practical application. Flower‐like gold nanoparticles have strong SERS enhancement performance due to having plenty of hot‐spots on their surfaces, and this enhancement is not dependent on the aggregation of the particles. These features make this kind of particle an ideal SERS substrate to improve the reproducibility in SERS imaging. Here, the SERS properties of individual flower‐like gold nanoparticles are systematically investigated. The measurements reveal that the enhancement of a single gold nanoparticle is independent of the polarization of the excitation laser with an enhancement factor as high as 108. After capping with Raman signal molecules and folic acid, the gold nanoflowers show strong Raman signal in the living cells, excellent targeting properties, and a high signal‐to‐noise ratio for SERS imaging. 相似文献
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Hongyan Liang Zhipeng Li Wenzhong Wang Youshi Wu Hongxing Xu 《Advanced materials (Deerfield Beach, Fla.)》2009,21(45):4614-4618
Surface‐enhanced Raman scattering (SERS) is a new optical spectroscopic analysis technique with potential for highly sensitive detection of molecules. Recently, many efforts have been made to find SERS substrates with high sensitivity and reproducibility. In this Research News article, we provide a focused review on the synthesis of monodispersed silver particles with a novel, highly roughened, “flower‐like” morphology by reducing silver nitrate with ascorbic acid in aqueous solutions. The nanometer‐scale surface roughness of the particles can provide several hot spots on a single particle, which significantly increases SERS enhancement. The incident polarization‐dependent SERS of individual particles is also studied. Although the different “hot spots” on a single particle can have a strong polarization dependency, the total Raman signals from an individual particle usually have no obvious polarization dependency. Moreover, these flower‐like silver particles can be measured by SERS with high enhancement several times, which indicates the high stability of the hot spots. Hence, the flower‐like silver particles here can serve as highly sensitive and reproducible SERS substrates. 相似文献
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In Situ Two‐Step Photoreduced SERS Materials for On‐Chip Single‐Molecule Spectroscopy with High Reproducibility 下载免费PDF全文
Wenjie Yan Longkun Yang Jianing Chen Yaqi Wu Peijie Wang Zhipeng Li 《Advanced materials (Deerfield Beach, Fla.)》2017,29(36)
A method is developed to synthesize surface‐enhanced Raman scattering (SERS) materials capable of single‐molecule detection, integrated with a microfluidic system. Using a focused laser, silver nanoparticle aggregates as SERS monitors are fabricated in a microfluidic channel through photochemical reduction. After washing out the monitor, the aggregates are irradiated again by the same laser. This key step leads to full reduction of the residual reactants, which generates numerous small silver nanoparticles on the former nanoaggregates. Consequently, the enhancement ability of the SERS monitor is greatly boosted due to the emergence of new “hot spots.” At the same time, the influence of the notorious “memory effect” in microfluidics is substantially suppressed due to the depletion of surface residues. Taking these advantages, two‐step photoreduced SERS materials are able to detect different types of molecules with the concentration down to 10?13m . Based on a well‐accepted bianalyte approach, it is proved that the detection limit reaches the single‐molecule level. From a practical point of view, the detection reproducibility at different probing concentrations is also investigated. It is found that the effective single‐molecule SERS measurements can be raised up to ≈50%. This microfluidic SERS with high reproducibility and ultrasensitivity will find promising applications in on‐chip single‐molecule spectroscopy. 相似文献