对巯基苯甲酸在电化学沉积金膜表面的SERS研究

The Studies on the SERS Spectra of 4-Mercaptobenzoic Acid Adsorbed on Gold Film by Electrochemical Deposition

SERS技术由于具有高灵敏度的表面效应,能够检测吸附在金属表面的单分子层或亚单分子层的分子,并能给出丰富的分子结构信息,因而己被广泛应用于界面科学以及定性和定量分析科学领域之中。本文在制备电化学沉积金纳米薄膜的基础上,利用扫描电镜观察金纳米薄膜的形貌,通过分析对巯基苯甲酸在电化学沉积金膜表面的SERS光谱,研究对巯基苯甲酸在金纳米薄膜表面的吸附方式。由SERS光谱分析,我们推断出对巯基苯甲酸可能通过羧基和S原子共同作用吸附在金纳米颗粒表面,且苯环平面可能与金薄膜表面成一定倾斜角。

Since the first observation of surface-enhanced Raman scattering（SERS）,this technology,with its very high surface sensitivity and selectivity,has emerged as a routine and powerful tool for the investigation and structural characterization of interfaces and thin-film solid materials.This paper reports that a new SERS-active gold film on the surfaces of a series of electric material has been prepared by an electrochemical technique in an aqueous solution of KAuCl4.With scanning electron microscopy,the morphology of the gold film is observed.By SERS measurements,the gold film is shown to be an excellent substrate,demonstrating significant enhancement effect.Therefore the adsorption behavior of 4-mercaptobenzoic acid on the gold film is studied,and the SERS spectra indicate 4-mercaptobenzoic acid molecules are adsorbed on the surfaces of gold nanoparticles through the carboxyl and S atom and there is a certain angle between the plan of benzene ring and the surface of gold nanoparticles.