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本文报道了采用原位傅立叶变换-表面增强拉曼散射(Fouriertransform-surfaceenhancedRamanscattering,FT-SERS)光谱技术测定在缓冲溶液和金电极界面上自组装单分子膜(self-assembledmonolayers,SAMs)的表面电离常数及其随电极电位改变的研究之初步结果。该方法通过应用FT-SERS原位光谱技术测定SAMs中质子化端基氨基的对离子ClO4特征峰强度随溶液pH值改变而变化的数值,获得相应的FT-SERS滴定曲线,进而可以确定一定条件下该SAMs功能化端基的表面电离常数。实验测定了2-氨基乙硫醇(2-aminoethanethiol,2AT)SAMs在三个不同电位下,在含有NaClO4支持电解质的Britton＆Robinson缓总溶液中的表面电离常数。实验结果揭示了在所研究的电位范围内,2ATSAMs端基氨基基团的表面pKa值随电极电位的正向增加而减小的变化规律。
In this paper, the surface ionization constants of self-assembled monolayers (SAMs) at buffer solution and gold electrode interface were measured by Fourier transform-surface-enhanced Raman scattering (FT-SERS) And its preliminary results with the study of electrode potential changes. In this method, the FT-SERS titration curve was obtained by using FT-SERS in-situ spectroscopy to measure the change of the characteristic ClO4 peak of protonated amino groups in SAMs with the pH value of the solution, and then certain conditions The surface ionization constants of this SAMs functionalized end group. The surface ionization constants of 2-aminoethanethiol (2AT) SAMs in Britton & Robinson buffer solution containing NaClO4 supporting electrolyte at three different potentials were determined experimentally. The experimental results revealed that the surface pKa of the 2-amino-terminated amino groups of 2ATSAMs decreased with the increase of the positive electrode potential within the investigated potential range.