| pH值和阴离子对吡啶2,6-二羧酸在金纳米颗粒表面的增强拉曼散射的影响 |
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| 引用本文： | 罗伟琪,成汉文,宦双燕,温国丽,陈媛媛,沈国励,俞汝勤.pH值和阴离子对吡啶2,6-二羧酸在金纳米颗粒表面的增强拉曼散射的影响[J].分析化学,2011,39(7). |
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| 作者姓名： | 罗伟琪 成汉文 宦双燕 温国丽 陈媛媛 沈国励 俞汝勤 |
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| 作者单位： | 湖南大学化学化工学院化学生物传感与计量学国家重点实验室; |
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| 基金项目： | 国家自然科学基金(Nos.20605007,20675005,20775023); “973”国家重点基础研究计划(No.2007CB310500)资助 |
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| 摘 要： | 表面增强拉曼散射(SERS)被用于检测细菌芽孢中的一种重要的标志物吡啶2,6-二羧酸(DPA)。以聚乙烯吡咯烷酮(PVP)为粘合剂,将60 nm的金粒子组装到表面打磨光滑的金电极上,制备稳定、灵敏的SERS基底。通过不同pH值下吸附在金基底上的DPA的SERS特征,考察DPA分子吸附构型发生的变化,并分析酸根离子对其吸附的影响。结果表明:在强酸条件下,DPA在Au NPs/PVP/Au基底上的SERS信号能达到最大增强;当pH值大于DPA二级解离常数时,DPA的SERS特征逐渐减弱。在DPA中引入不同酸根盐时,后者会取代纳米金表面的柠檬酸根所占的部分位点,改变Au NPs-Au基底的SERS增强性能。3种酸根吸附性能不同,所以获得的光谱强度存在差异。
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| 关 键 词： | 吡啶-2 6-二羧酸 表面增强拉曼散射 金纳米颗粒/聚乙烯吡咯烷酮/金基底 吸附构型 |
Influence of pH Value and Anion on Surface Enhanced Raman Scattering of 2,6-Pyridinedicarboxylic Acid on Gold Nanoparticle Suface |
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| LUO Wei-Qi,CHENG Han-Wen,HUAN Shuang-Yan,WEN Guo-Li,CHEN Yuan-Yuan,SHEN Guo-Li,YU Ru-Qin.Influence of pH Value and Anion on Surface Enhanced Raman Scattering of 2,6-Pyridinedicarboxylic Acid on Gold Nanoparticle Suface[J].Chinese Journal of Analytical Chemistry,2011,39(7). |
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| Authors: | LUO Wei-Qi CHENG Han-Wen HUAN Shuang-Yan WEN Guo-Li CHEN Yuan-Yuan SHEN Guo-Li YU Ru-Qin |
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| Institution: | LUO Wei-Qi,CHENG Han-Wen,HUAN Shuang-Yan,WEN Guo-Li,CHEN Yuan-Yuan,SHEN Guo-Li,YU Ru-Qin (State Key Laboratory for Chemo/Biosensing and Chemometrics,College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082) |
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| Abstract: | Surface enhanced Raman scattering(SERS) was used for the detection of 2,6-pyridinedicarboxylic acid(DPA),a biomarker for bacterial spores.The gold nanoparticles of 60 nm diameters were immobilized on a polished Au electrode using PVP as an adhesive layer.We demonstrated that the fabricated SERS substrates were steady and highly sensitive.The influence of pH and anions about the adsorption mechanism of DPA on colloidal gold nanoparticles has been examined by SERS.The results showed that using a gold nanopart... |
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| Keywords: | 2 6-Pyridinedicarboxylic acid Surface enhanced Raman scattering Gold nanoparticle/polyvinylpyrrolidone/gold substrate Adsorption mechanism |
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