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Studies on Suface Enhanced Raman Scattering in Nanoparticles Modified Electrode System

Author: HaoYanLing
Tutor: FangYan
School: Capital Normal University
Course: Optics
Keywords: Surface-enhanced Raman scattering ( SERS ) Silver electrode Gold electrode Silver nanoparticles Modified electrode Laser ablation
CLC: O437.3
Type: Master's thesis
Year: 2007
Downloads: 207
Quote: 0
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Abstract


Surface-enhanced Raman spectroscopy (SERS) is one of the most sensitive field study surface adsorption and interfacial reaction field spectroscopic techniques, genealogy electrochemical new technology for site characterization and research at the molecular level electrochemical system. SERS not only to identify the adsorbed molecules, but also by SERS spectroscopy and electrochemical parameters of the analysis system relationship more in-depth description of the electrochemical adsorption phenomenon. The results show that the behavior of the molecules associated with the potentiometer, factors such as the composition and concentration of the electrolyte. And preferably Description adsorbed species the different orientation structure (flat, vertical or bridge structure) acting on the surface. Study of surface enhanced Raman scattering (SERS) of Ag nanoparticles can be used as the enhanced substrate is widely used. Is well known that the oxidation-reduction method, the vapor phase synthesis method, a sol - gel method, a sputtering method and a laser ablation method and the like are commonly used silver nanoparticles preparation method, wherein the application of Redox most common noble metal nanoparticles, and the obtained is a better SERS enhancement basement, In addition, laser ablation for preparing nanoparticles operation simple and time of particles generated uniformity and scales better control, but does not introduce impurities, it is also a wide range of applications in many areas. Nanoparticles modified electrode by the artificial design of surface microstructure changes infinite mystery, the electrode has this strange effect and its potential application value caused by the widespread interest in the study, with the development of nanotechnology, nanoparticles modified electrode also rapidly advancing as an important part of nanotechnology. Paper using a redox method and laser ablation Preparation of silver nanoparticles, and rough silver electrode with its modified by a specific method to obtain a new high sensitivity surface enhanced substrate, and the substrate surface morphology was characterized by scanning electron microscopy. Experiments show that the silver electrode modified by nano-silver particles have a stable electrochemical characteristics than conventional colloidal the rough electrode system stronger SERS effect in nano-modified electrode has a definite breakthrough. In this paper, the obtained metallic silver nanoparticles modified electrode highly sensitive surface-enhanced effect, its application to molecular detection and electrode potential impact from the interaction between the state and the surface adsorption, piperidine molecules in the silver nanoparticles modified SERS spectrum of the electrode surface, high-quality, combined with the density functional theory (DFT) analysis of the adsorption of piperidine in different SERS substrate; based on the modified electrode highly sensitive SERS effect, further used in the exploration of the single molecule detection SERS spectrum of high-quality low concentrations of the pyrimidine series molecules. Raman spectroscopy as a probe photon is the ideal tool to study surface physics, chemical structure and properties. UV Raman spectroscopy is its high sensitivity, it is possible to avoid the fluorescence interference and resonance Raman effect advantage has aroused widespread attention. In this paper, thymine as the adsorbed molecules, the use of the high sensitivity of the UV Raman spectroscopy detects rough gold electrode surface high-quality surface Raman. The study found that, under UV excitation thymine strong dependence of Raman spectroscopy on the gold electrode surface on the electrode potential, with the negative electrode potential shift surface Raman spectrum of a significant change, and the respective peaks The trends are not the same. The analysis shows that this phenomenon is mainly caused by effects of charge transfer between thymine and gold atoms.

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CLC: > Mathematical sciences and chemical > Physics > Optics > Nonlinear optical ( light and matter) > Stimulated Raman Scattering
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