The study of dimethoate by means of vibrational and surface enhanced Raman spectroscopy on Au/Ag core-shell nanoparticles

• Published in: Guang pu xue yu guang pu fen xi Vol. 30; no. 12; p. 3249
• Main Authors: He, Qiang, Li, Si, Yu, Dan-Ni, Zhou, Gunag-Ming, Ji, Fang-Ying, Subklew, Guenter
• Format: Journal Article
• Language: Chinese
• Published: China 01.12.2010
• ISSN: 1000-0593
• DOI: 10.3964/j.issn.1000-0593(2010)12-3249-05

The vibrational structure of dimethoate, with its solid state and saturated solutions at acidic and basic conditions, was characterized with combination of means of FTIR and FT-Raman vibrational spectroscopy technology, and the comprehensive information about the dimethoate molecular groups' vibrational features was obtained. The surface enhanced Raman scattering (SERS) spectra of dimethoate at different concentrations with different acidic and basic conditions, and adsorbed on the substrate's surface of the core-shell Au/Ag nanoparticles, were also obtained. The adsorption states of dimethoate's molecule on the substrate's surface of the core-shell Au/Ag nanoparticles and the effects by the different acid-base conditions were investigated, with speculation of the adsorption mechanism. From the results, v(as)(NH), v(as)(CH3), v(O=C-N), tau(O=C-N), v(P-O), v(P=S), v(C-C) and delta(P-O-C) are the characteristic peaks of inner dimethoate structure's vibrations; and the concentration range in which dimethoate cou