用近红外傅里叶拉曼光谱研究了苏丹红Ⅲ分子在覆银纳米颗粒的抛光铝片表面上的吸附行为,得到了一系列高质量的增强拉曼散射(SERS)谱图。对苏丹红Ⅲ分子在银胶溶液、覆银滤纸、覆银粗糙铝片上的SERS谱进行比较,结果表明苏丹红Ⅲ分子在各基底上与银纳米颗粒表现出不同的吸附行为。在银胶溶液中,苏丹红Ⅲ分子主要是通过NN双键吸附在银纳米颗粒上的;在沉积了银纳米颗粒的滤纸表面,同样地,主要是由NN双键吸附;而在沉积了银纳米颗粒的抛光铝片表面,不仅NN双键参与了吸附,苏丹红Ⅲ分子中的羟基与银颗粒有相互作用,并且铝片上的氧化铝颗粒也可能吸附了苏丹红Ⅲ分子。

On the aluminum sheet coated with silver nano-particles, surface-enhanced Raman scattering (SERS) of azo dye Sudan III is studied. High quality SERS spectra are obtained, which indicates that the silver-coated aluminum sheet is an active SERS substrate. Comparing with the SERS spectra of azo dye Sudan Ⅲ adsorbed on silver colloid and on silver-coated filter paper, the SERS spectra of azo dye Sudan Ⅲ adsorbed on silver-coated aluminum sheet is different significantly. It shows that this change is derived from the different adsorption behavior of azo dye Sudan Ⅲ molecules on the silver nano-particles. Moreover, it indicates that the lacunaris surface structure makes the polished aluminum sheet become an active SERS substrate.