Adsorption behavior of 6-Mercaptonicotinic acid on self-assembled gold nano-substrates explored by SERS combined with theoretical calculations

作者：Yang, Wenpeng; Hu, Yongjun^*; Xie, Min

来源：Journal of Colloid and Interface Science, 2013, 408: 151-156.

DOI：10.1016/j.jcis.2013.07.022

• MNA
• Adsorption
• Gold substrates
• DFT
• SERS

As a typical Raman reporter molecule, 6-Mercaptonicotinic acid (C6H5NO2S, MNA) has three atoms (i.e., N, O, and S), which could be potential to chemically interact with gold nano-surface. In the present report, the adsorption behavior of MNA on self-assembled gold nano-substrates is explored by means of surface-enhanced Raman scattering and theoretical calculations. The results reveal that all the enhanced bands are assigned to in-plane vibrations. The ring triangle breathing coupling with C-S stretching band at 1108 cm(-1) is enhanced a lot and redshifts to 1088 cm(-1) in the SERS spectra. Furthermore, most of the bands related to N atom are apparently enhanced and shift in the SERS spectra. Based on the surface selection rule, it infers that MNA is vertically chemisorbed on self-assembled gold substrates through the S and the N atoms. The spectroscopic results are further interpreted by the density functional theory (DFT) calculations.

• 出版日期2013-10-15
• 单位华南师范大学