快速可控生长的宏观面积银纳米结构表面增强拉曼散射基底
首发时间:2015-05-21
摘要:本文采用固态离子学方法,将纯净银膜蒸镀到绝缘基底的两端作为电极,再将超离子导体材料RbAg4I5薄膜作为银离子的传输媒介蒸镀到绝缘基底之上并覆盖整个基底的表面。在外加直流电场作用下,阳极中的银原子会失去电子变成银离子,它借助RbAg4I5薄膜中的离子通道可以源源不断地向阴极移动。而到达阴极的银离子在得到电子后被还原成银原子,这些银原子有序地沉积在阴极边缘,逐渐形成形貌各异的银纳米结构。 实验结果表明,通过改变外加直流电场的电流强度,可以有效地控制所生长的银纳米结构的形貌及其生长速率。采用罗丹明6G (R6G) 水溶液作为探针分子对快速生长的宏观面积银纳米结构的表面增强拉曼效应进行了测试。
关键词: 纳米与光学 可控生长 宏观面积 银纳米结构 表面增强拉曼散射
For information in English, please click here
A rapid and controllable method to growing large area of silver nano-structure SERS substrates
Abstract:In this paper,we introduce a solid-state ionics method for the large-area synthesis of silver nano-structures. First, two parallel silver films separated by a distance of about 8 cm, was deposited by vacuum thermal evaporation on the two ends of the RbAg4I5 film were used as electrodes. Then the superionic conductor RbAg4I5 film, with a thickness of about 400 nm, was deposited by vacuum thermal evaporation over the substrate. With direct current electric field, the silver atoms lost electrons to become silver ions on the anode surface, and then the silver ions transferred to the cathode through the "ion channels" in the RbAg4I5 film, while the electrons transferred to the cathode by a conducting wire in the external circuit. At the edge of the cathode the silver ions gained electrons and were reduced to silver atoms. The silver nanostructures were obtained by accumulating and crystallizing the silver atoms in the cathode. The experiment results showed that the changing direct current can effectively control the growth of the morphology of silver nano structure and its growth rate.
Keywords: Nano and optic controllable growth large area silver nano-structure SERS
论文图表:
引用
No.4642009105971214****
同行评议
共计0人参与
勘误表
快速可控生长的宏观面积银纳米结构表面增强拉曼散射基底
评论
全部评论0/1000