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基于壳层隔绝纳米粒子增强拉曼光谱技术,合成了Au@SiO2纳米粒子,并对其进行了相关表征.结果表明,包裹的二氧化硅层连续、致密,Au@SiO2膜/Ti电极上可获得吸附吡啶分子的高质量表面增强拉曼光谱(SERS)信号.通过Pt、Ni电极的测试,证实该信号源于吸附在基底表面的吡啶分子.此外,Au@SiO2膜/Ti电极上吸附吡啶分子的现场SERS光谱研究表明:在-0.1~-0.6 V电位区间,吡啶分子平躺吸附;从-0.6 V起,吸附的吡啶分子由平躺逐渐转变为垂直;而当电位为-1.2 V时,电极表面析氢,吡啶脱附.
Au @ SiO2 nanoparticles were synthesized and characterized by shell-enhanced nanoparticle-enhanced Raman spectroscopy. The results showed that the encapsulated silica layer was continuous and dense, and the Au @ SiO2 film / Ti electrode High-quality surface-enhanced Raman spectroscopy (SERS) signals of adsorbed pyridine molecules were obtained.Pt and Ni electrodes were tested to confirm that the signal originated from pyridine molecules adsorbed on the surface of the substrate.In addition, pyridine was adsorbed on the Au @ SiO2 film / Ti electrode The SERS spectra of the molecules showed that the pyridine molecules adsorbed in the horizontal direction at -0.1 ~ -0.6 V potential. From -0.6 V onwards, the adsorbed pyridine molecules gradually changed from flat to vertical. At the potential of -1.2 V , Electrode surface hydrogen evolution, pyridine desorption.