| 银胶溶液pH值对结晶紫的表面增强拉曼光谱增强效果的影响 |
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| 引用本文： | 李东飞,曹彪,杨光,里佐威,高淑琴,周密,门志伟,张学亚.银胶溶液pH值对结晶紫的表面增强拉曼光谱增强效果的影响[J].光散射学报,2009,21(2):132. |
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| 作者姓名： | 李东飞 曹彪 杨光 里佐威 高淑琴 周密 门志伟 张学亚 |
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| 作者单位： | 吉林大学物理学院,长春,130023 |
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| 摘 要： | 通过NaBH4还原AgNO3制得银溶胶, 分析了结晶紫溶液表面增强拉曼光谱随银胶溶液pH值减小而逐渐减弱的机理。其原因是当加入酸改变银胶溶液pH值时, 在静电力作用下H+聚集在粗糙且存在偶电层(Ag+─负吸附质)的银胶表面, 使胶体中存在的表面等离子体共振吸附态的光吸收源随着H+浓度的增加逐渐减弱。并且H+与结晶紫的竞争作用又使结晶紫与银颗粒之间的吸附数量减少, 最终使结晶紫SERS强度随着pH值减小而逐渐减弱。我们测得银胶溶液的紫外──可见吸收光谱吸收峰强度随着pH值减小而逐渐减弱, 证明了分析的正确性。
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| 关 键 词： | 表面增强拉曼光谱 (SERS) 结晶紫(CV) 银溶胶 pH值 紫外──可见吸收光谱 |
| 收稿时间： | 2009/2/18 |
Effect of pH Value in Silver Colloids System on Surface-Enhanced Raman Scattering Spectroscopy of Crystal Violet |
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| LI Dong-fei,CAO Biao,YANG Guang,LI Zuo-wei,CAO Shu-qin,ZHOU Mi,MEN Zhi-wei,ZHANG Xue-ya.Effect of pH Value in Silver Colloids System on Surface-Enhanced Raman Scattering Spectroscopy of Crystal Violet[J].Chinese Journal of Light Scattering,2009,21(2):132. |
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| Authors: | LI Dong-fei CAO Biao YANG Guang LI Zuo-wei CAO Shu-qin ZHOU Mi MEN Zhi-wei ZHANG Xue-ya |
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| Institution: | Department of Physics;Jilin University;Changchun 130023;China |
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| Abstract: | We report that the CV SERS intensity decreases with the increase of pH value of the silver colloids,which are prepared by chemical oxidation-reduction reactions with silver nitrate and sodium borohydride.The previous research work had shown that the intense band at 390nm in pure silver colloids is a characteristic of the plasma resonance absorption for silver spheres in water.When a certain amount of the HNO3 are added,we can see that the absorption intense band at 390 nm reduced to some extent.This phenome... |
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| Keywords: | surface enhanced Raman spectroscopy crystal violet silver colloid pH value UV-visible absorption spectrum |
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