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Ag and ZnO nanostructures on the surface-enhanced Raman scattering strengthening mechanisms

Author: CaiZhiCheng
Tutor: XinBaiFu；FuHongGang
School: Heilongjiang University
Course: Physical and chemical
Keywords: Surface Enhanced Raman Scattering Silver Zinc oxide Aggregates
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 255
Quote: 1
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Abstract


Surface-enhanced Raman spectroscopy (SERS) is a powerful tool for studying molecular adsorption on metal surfaces. SERS research field of two hot spots of the research and application of SERS enhancement mechanism. In order to strengthen the enhancement and exploration strengthening to enhance the effect of the causes, this paper focuses on a series of work in the following areas: 1. Adjacent particles can produce localized surface plasmon coupling of Ag nanoparticles aggregates with more strong SERS activity in the field of SERS of concern. Prepared aggregation of Ag particle aggregates are more complex synthesis process: Preparation of nano-particles, followed by their aggregation. We have developed a simple synthesis of Ag nanoparticles aggregate one-pot process. Synthetic surfactant SDS for protecting reagent and coupling agent, obtained by controlling conditions such as the reaction time to achieve the adjustment of the degree of aggregation of Ag nanoparticles aggregates. By means of SEM and UV-vis other means, suggesting the possibility of the formation of Ag nanoparticle aggregates. Since the particle aggregates with high SERS activity and stability, such nanoparticles are expected to aggregate as a SERS substrate used in the trace detection and bioassay. 2 Preparation of ZnO of a one-dimensional array, and a variety of different morphologies ZnO micro / nano structure, using the photoreduction method, the Ag particles with the compound in order to build a ZnO / Ag using mercaptoaniline (PATP) as a probe molecule SERS activity of the complex were evaluated. By the difference between the spectral analysis PATP ZnO / Ag nanocomposite Raman Spectroscopy and Silver nanoparticles on the substrate to analyze the strengthening effect of ZnO in SERS. And observe the different morphologies of ZnO and Ag composite signal differences of different morphologies of ZnO on the SERS signal. 3 core-shell structure with precious metal composite material has excellent optical properties, catalytic properties, excellent stability and a wide range of regulation. We designed and prepared PS / ZnO / Ag, PS / Ag, SiO , 2 / ZnO / Ag and SiO 2 / Ag and other composite structures. Similarities and differences between the Bila Man signal, enhanced by the ZnO SERS active organic molecules. Due to the participation of the semiconductor material, so that the stability and strength of the SERS signal is greatly improved. Thus, the composite structure having a very important value for the study of the surface of SERS.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
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