title: Electrochemical Surface Plasmon Resonance Spectroscopy at Bilayered Silver/Gold Films.
abstract: Bilayered silver/gold films (gold deposited on top of the silver film) were used as substrates for electrochemical surface plasmon resonance spectroscopy (EC-SPR). EC-SPR responses of electrochemical deposition/stripping of copper and redox-induced conformation changes of cytochrome c immobilized onto self-assembled monolayers preformed at these substrates were measured. Influence of the Ag layer thickness and the double-layer capacitance on the EC-SPR behavior was investigated. The results demonstrated that the bilayered Ag/Au metal films produce a sharper SPR dip profile than pure Au films and retain the high chemical stability of Au films. Contrary to the result by the Fresnel calculation that predicts a greater fraction of Ag in the bilayered film should result in a greater signal-to-noise ratio, the EC-SPR sensitivity is dependent on both the Ag/Au thickness ratio and the chemical modification of the surface. Factors affecting the overall SPR sensitivity at the bilayered films, such as the film morphology, potential-induced excess surface charges, and the adsorbate layer were investigated. Forming a compact adsorbate layer at the bilayered film diminishes the effect of potential-induce excess surface charges on the SPR signal and improves the overall EC-SPR sensitivity. For the case of redox-induced conformation changes of cytochrome c, the SPR signal obtained at the bilayered silver/gold film is 2.7 times as high as that at a pure gold film.
authors.affiliation: Institute of Surface Analysis and Biosensing, School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, P. R. China.
authors.forename: Peimin
authors.initials: P
authors.lastname: Zhai
authors.forename: Jun
authors.initials: J
authors.lastname: Guo
authors.forename: Juan
authors.initials: J
authors.lastname: Xiang
authors.forename: Feimeng
authors.initials: F
authors.lastname: Zhou