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Surface-Enhanced Raman Scattering Spectra of 4-Dimethylaminoazobenzene and Vitamin B12

Author: ZhangZhenLong
Tutor: MoYuJun
School: Henan University
Course: Optics
Keywords: Surface -enhanced Raman scattering 4 - dimethylamino azobenzene Silver plastic Silver mirror Copper Single-molecule detection Vitamin B12
CLC: O433
Type: Master's thesis
Year: 2004
Downloads: 93
Quote: 1
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Abstract


In recent years, the study of the structure of the azo dye caused attention, because they are on the use of dyes in the industrial largest category, and as a pH indicator, oxidation reduction indicator, the metal color indicator in analytical chemistry has a wide range of applications. In addition, the azo dye is widely used in a reversible optical information storage (holographic and digital), the storage process is the use of azo dyes photorelease trans - cis - trans isomerization process, thus use of the medium refractive the local variation of the rate of storage. The light-induced change of the polarity and molecular structure of the azo derivative as a reversible molecular switching device can be universally applied. Research on the structure and characteristics of the azo dye has been reported in the literature, mainly by UV - visible absorption spectrum, near infrared and Raman spectroscopy, and photochemical methods. But very few surface-enhanced Raman scattering (SERS) reports. A large number of studies have shown that the surface-enhanced Raman scattering (SERS) for the to study adsorbed on the molecular structure of the metal surface and the adsorbed molecules with the surface of the interaction is a very powerful tool. In this thesis, the use of surface-enhanced Raman scattering techniques to study the azo dyes -4 - dimethylamino azobenzene (4-Dimethylaminoazobenzene, DAB) in the state of the same kind of metal surfaces in different environments and different metal surface adsorption analysis environment factors that affect their molecular structure, so as to obtain more information on the molecular structure. This thesis consists of the following five parts: The first chapter briefly surface-enhanced Raman scattering phenomenon found, characteristics, mechanism, and its development application. The second chapter of DAB molecules in different substrates, ie silver plastic, silver mirror and copper surface SERS spectra. The results showed that the DAB molecules are given by dimethylamino adsorbed on the metal surface, but under different circumstances, the adsorption state is different. In silver glue, and its structure is stable trans structure, while the surface of the silver mirror, and its structure by trans transformation of cis structure, which is mainly due to water molecules in the solution, and the gas molecules of the air in the DAB molecular role difference . SERS spectra in silver mirror and copper surface is also different, which is due to the enhanced ability of the silver mirror than copper. Chapter SERS spectra of of DAB molecules in different PH value of silver colloid solution. When the solution pH values ??less than 4, since the protonated molecules of DAB from the azo-type structure is converted to the quinone-type structure, the chapter using SERS technique to study the structure of this variation, and found that the change is of such a structure can be reversible. Henan University Optics the 2001 Thesis DAB molecules in different PH value of the solution with the silver nanoparticle interactions differ, this is due to the N atom of the dimethylamino bring a positive charge. The fourth chapter of the the DAB single molecule SERS spectra of the molecule. We use a simple approach, the colloidal silver solution containing DAB molecule drops on the foil, and excitation light is focused on the droplets be measured directly, \Raman shift the fluctuations generated over time, which is caused due to the individual molecules, and the interaction of the silver nano-particles in the surface of the silver nanoparticles l different adsorption state. In addition, statistical analysis showed that the molecular Raman signal Poisson distribution. These indicate that the DAB molecule at room temperature and under conventional conditions to obtain SERS spectrum of the single molecule. Chapter of vitamin B,: the SERS spectrum. Vitamin BI: Raman spectra in the low wavenumber until now have not been reported. This chapter using surface-enhanced Raman scattering techniques to obtain vitamin B: SERS in the number of full-wave spectrum, for the use of the SERS technology carried vitamin BI: detection and other drug testing is an important reference value.

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