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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (16): 1616-1622. 上一篇    下一篇

研究论文

乐果与氧化乐果在金/银核-壳粒子上的SERS研究

黎司1，吉芳英*,1，虞丹尼2，周光明2，何强1   

  1. (1重庆大学城市建设与环境工程学院 三峡库区生态环境教育部重点实验室 重庆 400030) 
    (2西南大学化学化工学院 重庆 400715)
  • 投稿日期:2010-01-07 修回日期:2010-04-30 发布日期:2010-04-28
  • 通讯作者: 黎司 E-mail:lisi80@126.com
  • 基金资助:

    科技部中德合作项目

Surface Enhanced Raman Scattering of Dimethoate and Omethoate on Core-Shell Au/Ag Nanoparticle

Li Si1 Ji Fangying*,1 Yu Danni2 Zhou Guangming2 He Qiang1   

  1. (1 Faculty of Urban Construction and Environmental Engineering, Key Laboratory of the Three Gorges Reservoir Region’s Eco-environment, Ministry of Education, Chongqing University, Chongqing 400030)
    (2 School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715)
  • Received:2010-01-07 Revised:2010-04-30 Published:2010-04-28

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联合红外、拉曼光谱及其在金/银核-壳粒子上的表面增强拉曼散射(SERS)光谱表征了乐果和氧化乐果两种乐果类似物, 归属并分析了两乐果类似物中P＝S与P＝O的不同而引起的振动模式, 峰位变化及其酸碱影响. 振动光谱显示, ν(P＝O), ν(P＝S)分别在690, 650 cm－1附近, 两分子结构中对应的ν(NH), νs(CH2), ν(C—O), ν(O＝C—N) II, ν(S—CH2)振动峰位中差异显著, 但νas(CH3), ν(P—O—C), ν(O＝C—N) I, δ(CH3), ν(C—C), ν(C—C＝O)则基本对应. 在金/银核-壳粒子基底上, 进一步探讨了两乐果类似物中各基团在不同浓度, pH值及酸、碱水解历程条件下的SERS变化规律, 并运用SERS机理并结合TEM初步阐述了两乐果类似物在金/银核-壳粒子表面的吸附状态.

关键词: 乐果, 氧化乐果, 表面增强拉曼散射, 吸附

Two dimethoate analogues-dimethoate and omethoate, are characterized by vibrational spectroscopy-FT-Raman and FTIR, and surface enhanced Raman scattering (SERS) on the substrate of Au/Ag core-shell nanoparticle. The vibrational peaks are assigned, and the vibrational mode and peaks’ shift resulting from different inner structures P＝S and P＝O in molecules of two dimethoate analogues are also analyzed at acidic and basic conditions. From the vibrational spectra, these groups ν(NH), νs(CH2), ν(C—O), ν(O＝C—N) II, ν(S—CH2), ν(P＝O) and ν(P＝S) in the analogues present notable different vibrational peaks, except for 690 cm－1 ν(P＝O) and 650 cm－1 ν(P＝S), while the peaks of νas(CH3), ν(P—O—C), ν(O＝C—N) I, δ(CH3), ν(C—C), ν(C—C＝O) are almost corresponding. The relationships of concentrations, pH values and hydrolysis processes in acidic and basic condition, to dimethoate analogues’ SERS are further discussed, and the analogues’ adsorption status on the Au/Ag core-shell nanoparticle surface are also speculated with SERS mechanisms and TEM.

Key words: dimethoate, omethoate, surface enhanced Raman scattering (SERS), adsorption