Department of Chemistry, University of Science & Technology of China, Hefei, Anhui 230026, China.
Talanta. 2013 Dec 15;117:39-44. doi: 10.1016/j.talanta.2013.08.050. Epub 2013 Sep 3.
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.
时间分辨动态表面增强拉曼散射（D-SERS）可用于观察目标与基底之间的化学反应过程以及分析物的吸附形态变化。本文采用 D-SERS 方法，系统研究了农药代森锌在金纳米粒子上的吸附及其与基底的相互作用，以及不同激光功率下 SERS 光谱强度的交替变化。代森锌的 b2 和 a1 振动模式与标准带相关，其 Raman 强度随时间的延长呈现出不同的规律。同时，由于不同浓度的代森锌的 SERS 振动光谱表现出不同的 SERS 信号，时间分辨 D-SERS 的结果表明分子在金基底上的分解和不同的吸附形态。连续时间分辨光谱方法为目标分子提供了指纹图谱，为农药或其他探针分子的连续评估和鉴定提供了巨大的实际潜力。
