苯甲酸的羟基取代物在银纳米颗粒表面的吸附行为的研究

分别以覆银滤纸和银胶溶液中的银纳米颗粒为基底,对苯甲酸的三种羟基取代物(n-HBA,n=P,M,O)进行了表面增强拉曼散射(SERS),发现PHBA分子在覆银滤纸上的SERS光谱和银胶中的SERS光谱明显不同,而MHBA分子和OHBA分子在两种基底上的SERS光谱却很相近。分析表明这些变化都来源于分子在银纳米颗粒表面吸附行为的变化,基底的表面特性和分子的表面构型对分子在基底表面的吸附行为会产生很大的影响。

The Adsorption Behaviors of a Series of n-Hydroxybenzoic Acids (n=p,m,o) on Silver Nano-particles

Surface-enhanced Raman scattering (SERS) spectra of a Series of n-hydroxy- benzoic Acids (n-HBA, n=P, M and O) adsorbed on the surface of the silver nano-particles were studied, respectively, in the silver colloidal solution and on the dried silver-coated filter paper. Significant changes were found in the SERS spectra of PHBA molecules adsorbed on the two substrates, while the changes in MHBA's spectra and OHBA's were not found almost. The analyses showed that the origins of these changes were the different adsorption behavior of molecules adsorbed on the silver nano-particles, and the surface characteristic of the substrate and the surface configuration of the adsorbate could exert a great influence on the adsorption behavior of the adsorbate on the substrate.