1. A SERS study of thiocyanate adsorption on Au-core Pd-shell nanoparticle film electrodes.
- Author
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Ping-Ping Fang, Jian-Feng Li, Xiao-Dong Lin, Anema, Jason R., De-Yin Wu, Bin Ren, and Zhong-Qun Tian
- Subjects
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THIOCYANATES , *ADSORPTION (Chemistry) , *GOLD compounds , *STRUCTURAL shells , *NANOPARTICLES , *THIN films , *ELECTRODES , *SURFACE enhanced Raman effect - Abstract
We have systematically studied the adsorption of thiocyanate (SCN−) on gold-core palladium-shell nanoparticles (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 νC—N stretching frequency increases 6 cm−1 for S-bound SCN− and 10 cm−1 for N-bound SCN−. It infers that the 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. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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