蒸发过程对碳纳米管复合结构拉曼增强特性的影响  

Effect of Evaporation Process on Surface-Enhanced Raman Scattering Properties of Carbon Nanotubes Composite Structure

作　　者：张晓蕾[1] 张洁[1] 龚天诚[1] 朱永[1] 

机构地区：[1]重庆大学光电工程学院光电技术及系统教育部重点实验室,重庆400044

出　　处：《中国激光》2016年第4期187-192,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61376121)

摘　　要：为了分析探针分子水溶液蒸发过程对三维基底的表面增强拉曼散射(SERS)特性的影响,利用磁控溅射和高温退火的方法制备了银纳米颗粒修饰垂直排列的碳纳米管阵列(Ag/CNTs)三维复合结构样品。采用time-course SERS mapping测试方法,分别以1μmol/L罗丹明6G(R6G)和10-2μmol/L孔雀石绿(MG)作为探针分子,进行了相应的实验。研究表明:随着蒸发时间逐渐增加,探针分子的拉曼信号先增强后减弱。分析其主要原因:探针分子溶液在蒸发过程中,由于毛细力的作用,引起探针分子与三维结构之间"热点"的变化,从而带来电磁场增强特性的变化;此外,聚焦深度和浓度的变化也影响拉曼信号。In order to analyze the effect on surface enhanced Raman scattering（SERS） properties of threedimensional（3D） substrate during evaporation process of the probe molecules solution, a 3D composite structure of silver nanoparticles modified vertically aligned carbon nanotubes array（Ag/CNTs） is produced by magnetron sputtering and thermal annealing processes. Relevant experiments use the time-course SERS mapping test method and select 1 μmol/L Rhodamine 6G（R6G） and 10-2μmol/L malachite green（MG） as probe molecules, respectively.The results indicate that, with the increase of evaporation time, the Raman signal of probe molecules enhance firstly and then decrease. It is this main reason that, during evaporation process of analyst molecule, the capillary forces make the hotspots between the probe molecule and three- dimensional structure change, and then lead the electromagnetic field enhancements to change; in addition, the depth of focus and concentration change also influence the Raman signal.

关 键 词：材料 表面增强拉曼散射 碳纳米管 银纳米颗粒 探针分子 蒸发过程 

分 类 号：O433[机械工程—光学工程]