树枝状银微纳结构的表面增强拉曼散射效应研究

发布时间：2018-05-26 02:35

本文选题：表面增强拉曼散射 + 银微纳结构　；参考：《分析化学》2017年03期

【摘要】：利用两电极电化学沉积法制备出一种树枝状银微纳结构基体。扫描电子显微镜(SEM)的表征结果证实所制备的银基体呈现出完整的树枝状结构,具有对称性的树枝和树干,且树叶清晰可见。实验结果表明,树枝状银微纳结构的表面增强拉曼散射(Surface-enhanced Raman scattering,SERS)可以检测到超低浓度的罗丹明6G(Rhodamine 6G,R6G,10~(-10)mol/L)光谱信号,即树枝状银微纳结构作为SERS基体表现出较好的灵敏性;当R6G的浓度在10~(-5)~10~(-10)mol/L范围依次降低一个数量级时,谱带610 cm~(-1)处的拉曼散射强度的相对标准偏差分别为12.1%,12.0%,11.7%,10.9%,13.2%和14.3%,表明所制备银基体的SERS"热点"(Hot spots)分布较均一,树枝状银微纳结构作为SERS基体具有较好的重现性;当低SERS活性的3-巯基丙酸(3-Mercaptopropionic acid,3MPA)的检测浓度为10~(-5)mol/L时,利用树枝状银基体能检测到3MPA的SERS光谱,说明所制备的银基体对低活性物质也具有较好的SERS灵敏性。
[Abstract]:A dendritic silver nanostructure matrix was prepared by two electrode electrochemical deposition. The results of scanning electron microscopy (SEM) show that the silver matrix exhibits a complete dendritic structure, symmetrical branches and trunks, and leaves are clearly visible. The experimental results show that the surface-enhanced Raman scattering (SERS) of dendritic silver nanocrystals can detect the very low concentration of Rhodamine 6G(Rhodamine 6GN R6GN 10 ~ (10) mol / L, that is to say, the dendritic silver nanocrystalline structure can be used as a SERS substrate with good sensitivity. When the concentration of R6G decreased by one order of magnitude in the 10~(-5)~10~(-10)mol/L range, the relative standard deviation of Raman scattering intensity at the band of 610 cm ~ (-1) was 12.1cm ~ (-1) and 12.0%, 11.7cm ~ (10.9) ~ 13.2% and 14.3%, respectively, indicating that the SERS "hot spots" of the silver matrix prepared were more uniform. The dendritic silver nanocrystalline structure has good reproducibility as SERS matrix, and when the detection concentration of 3mercaptopropionic 3-mercaptopropionic acid 3MPA) with low SERS activity is 10~(-5)mol/L, the SERS spectrum of 3MPA can be detected by dendritic silver matrix. The results show that the silver matrix also has good SERS sensitivity to low active substances.
【作者单位】：江汉大学光电化学材料与器件教育部重点实验室化学与环境工程学院;
【基金】：国家自然科学基金(No.51303066) 湖北省自然科学基金(No.2016CFB194)资助项目~~
【分类号】：O614.122;O657.37

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