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本文采用种子生长法、利用双表面修饰剂制备了金纳米棒,其长径比为3.5:1。该金纳米棒的消光光谱显示:利用该方法制备的金纳米棒有两个表面等离子共振(SPR)峰,分别位于540nm和780nm处。其中780nm处的表面等离子共振峰靠近红外光谱区,可以与文中采用的激发光源(785nm激光)较好的匹配,从而有助于实现共振拉曼散射增强效应。本文以D-核糖(D-Ribose)为探测分子,基于金纳米棒进行了近红外表面拉曼散射(NIR-SERS)活性检测,从而获得了光谱重复性良好的NIR-SERS光谱图。同时,采用密度泛函理论(DFT),以B3LYP/6-31G和6-31G/LanL2DZ为基组函数,分别对D-核糖分子以及D-核糖分子与金原子形成的团簇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符合较好。此外,文中对D-核糖的NIR-SERS谱带进行了分析和归属,发现当D-核糖分子吸附到金纳米粒棒上时,主要是以羟基上的氧原子(O9)吸附在金原子上而形成金属键。
In this paper, we use the seed growth method to prepare gold nanorods with double surface modifier, the aspect ratio of 3.5: 1. The extinction spectra of gold nanorods show that the gold nanorods prepared by this method have two surface plasmon resonance (SPR) peaks at 540 nm and 780 nm, respectively. Among them, the surface plasmon resonance at 780 nm is close to the infrared spectral region, which can be matched well with the excitation light source (785 nm laser) used in the article so as to be helpful for enhancing the resonance Raman scattering enhancement effect. In this paper, the NIR-SERS activity of NIR-SERS was detected by using D-Ribose as the probe, and the NIR-SERS spectrum with good spectral repeatability was obtained. At the same time, the structures of D-ribose and D-ribose and gold atoms were optimized by density functional theory (DFT) and B3LYP / 6-31G and 6-31G / LanL2DZ Ordinary Raman spectrum (NR) calculation, found that the theoretical value and experimental values in good agreement. In addition, the NIR-SERS bands of D-ribose were analyzed and assigned. It was found that when the D-ribose molecules were adsorbed onto the gold nanoparticle rods, the oxygen atoms (O9) on the hydroxyl groups were mainly adsorbed on gold atoms While forming a metal bond.