The time-resolved D-SERS vibrational spectra of pesticide thiram.

Time-resolved dynamic-SERS (D-SERS) can observe the process of chemical reaction between target and substrate and changes of adsorptive forms for analytes. In this paper, the vibrational spectra of pesticide thiram adsorbed on Au nanoparticles and intensity alternation of SERS spectra depended on different laser powers have been systematically investigated using the method of D-SERS. The Raman intensities of b2 and a1 modes of thiram related to the standard band appear different regulars with the extending time. Meanwhile, due to SERS vibrational spectra of pesticide thiram at different concentrations exhibit different SERS signals, the results of time-resolve D-SERS demonstrate the breakdown of band and different adsorptive forms of molecule on Au substrate. The continuous time-resolved the spectroscopic method offers the fingerprints of target molecules and provides great practical potentials for the continuous assessment and identification of pesticide or other probe molecules.