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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 of aqueous solution evaporation of probe molecules on surface enhanced Raman scattering (SERS) of three-dimensional substrates, Ag / Ag nano-particles arrayed vertically aligned carbon nanotube arrays were prepared by magnetron sputtering and high temperature annealing. CNTs) three-dimensional composite structure samples. Using the time-course SERS mapping method, the corresponding experiments were carried out with 1μmol / L rhodamine 6G (R6G) and 10-2μmol / L malachite green (MG) as probe molecules respectively. The results show that with the evaporation time increasing, the Raman signal of the probe molecule first increases and then decreases. Analysis of the main reasons: the probe molecule solution in the evaporation process, due to the capillary force, causing the probe molecules and the three-dimensional structure between the “hot spot ” changes, resulting in changes in electromagnetic field enhancement characteristics; In addition, the depth of focus And the change in concentration also affects the Raman signal.