论文部分内容阅读
本文采用静电自组装的方法制备了二维纳米银膜。UV-vis吸收光谱显示其等离子体共振吸收带位于400+900nm的光谱范围,延伸到了近红外区,可以较好的匹配785nm的近红外激发光源。以该纳米银膜为基底,对2-氨基苯硫酚(2-ATP)分子进行了近红外表面增强拉曼散射(NIR-SERS)检测,获得了重复性良好的NIR-SERS光谱图。实验表明:以2-ATP为探针分子时,该纳米银膜的NIR-SERS增强因子达到2.19×109。同时,本文采用密度泛函理论(DFT),以B3LYP/6-31G为基函数,对2-ATP分子进行结构优化和普通拉曼光谱(NR)计算,发现理论值和实验值吻合较好。此外,对2-ATP的NIR-SERS谱带进行了归属分析,发现当2-ATP分子在纳米银表面吸附时,是以-SH基团吸附到银表面,且同时-SH基团会被纳米银氧化。
In this paper, a two-dimensional nano-silver film was prepared by electrostatic self-assembly method. UV-vis absorption spectra show that the plasmon resonance absorption band located in the 400 +900 nm spectral range, extending to the near infrared region, which can better match the 785 nm near-infrared excitation light source. The NIR-SERS spectra of 2-aminothiophenol (2-ATP) molecules were detected by NIR-SERS. The NIR-SERS spectra with good repeatability were obtained. Experiments show that: 2-ATP as a probe molecule, the nano-silver film NIR-SERS enhancement factor reached 2.19 × 109. In the meantime, using density functional theory (DFT) and B3LYP / 6-31G as the basis function, the structure optimization and ordinary Raman spectroscopy (NR) calculation of 2-ATP molecule were carried out. The theoretical and experimental data agree well with each other. In addition, the NIR-SERS bands of 2-ATP were analyzed at home and found that when the 2-ATP molecules adsorbed on the surface of nano-silver, -SH groups were adsorbed on the silver surface, Silver oxidation.