A SERS study of thiocyanate adsorption on Au-core Pd-shell nanoparticle film electrodes

作者：Fang, Ping-Ping; Li, Jian-Feng; Lin, Xiao-Dong; Anema, Jason R.; Wu, De-Yin; Ren, Bin; Tian, Zhong-Qun^*

来源：Journal of Electroanalytical Chemistry, 2012, 665: 70-75.

DOI：10.1016/j.jelechem.2011.11.025

• SERS
• Au
• Pd
• Core-shell nanoparticle
• Electronic structure
• Adsorption

We have systematically studied the adsorption of thiocyanate (SCN-) on gold-core palladium-shell nano-particles (Au@Pd NPs) with different Pd shell thicknesses by surface-enhanced Raman scattering (SERS). When the Pd shell thickness is increased from one to ten atomic layers, the v(C-N) stretching frequency increases 6 cm(-1) for S-bound SCN- and 10 cm(-1) for N-bound SCN-. It infers that the v(C-N) stretching frequency is quite sensitive to electronic properties of the NP surface, but even more so when bonding to Pd occurs through the N atom (at negative potentials) than when it occurs through the S atom (at positive potentials). Data for a second probe, p-aminothiophenol (PATP), was compared to that of SCN-; however, PATP was found to be less sensitive than SCN- to the surface electronic properties of Au@Pd NPs.

• 出版日期2012-1-15
• 单位厦门大学