作者：申治中1, 李芒芒1, 王红旺1, 禚凯1, 张强1, 袁仲云1, 张虎林1, 冀健龙1,2, 桑胜波1, 张文栋1
作者单位：1. 太原理工大学信息工程学院微纳系统研究中心, 山西 太原 030024;
2. 山西省高端煤矿装备协同创新中心, 山西 太原 030024
关键词：表面增强拉曼散射;交流电沉积;金;铜;枝晶
摘要：
为进一步提高拉曼探测器的检测灵敏度、降低制备成本，使用交流电沉积法在预定的微区域内制备Au/Cu双金属纳米枝晶作为表面增强拉曼散射（surface-enhanced Raman scattering，SERS）基底。通过调节电解液中金、铜离子的浓度配比，制备不同金、铜质量比的SERS基底。以四巯基吡啶作为指针分子，进行激光共焦显微拉曼实验。结果表明：Au/Cu双金属纳米枝晶性能优于单独Au纳米枝晶与Cu纳米枝晶，且铜质量占比为30.1%的双金属SERS基底相比质量占比为13.2%、44.3%的基底具有更高的拉曼活性。从物理增强机理的角度，揭示增强性能与形貌特征的关系，即纳米枝晶分支分布越密集，性能越好。
In-Situ preparation of Au/Cu bimetallic SERS detector by alternating current electrodeposition
SHEN Zhizhong1, LI Mangmang1, WANG Hongwang1, ZHUO Kai1, ZHANG Qiang1, YUAN Zhongyun1, ZHANG Hulin1, JI Jianlong1,2, SANG Shengbo1, ZHANG Wendong1
1. Micro and Nano-system Research Center, College of Information Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2. High-end coal mine equipment collaborative innovation center of Shanxi Province, Taiyuan 030024, China
Abstract: In order to improve the detection sensitivity and reduce the preparation cost of Raman detector, Au/Cu bimetallic nano-dendrites are prepared as the surface-enhanced Raman scattering (SERS) substrates in a predetermined micro-area using AC electrodeposition. SERS substrates with different gold and copper mass ratios are prepared by adjusting the concentration of gold and copper ions in the electrolyte. 4-mercaptopyridine is taken as the pointer moleculars to have a laser confocal microscopy Raman experiment. Results show that performance of Au/Cu bimetallic nano-dendrites is better than Au nanocrystalline dendrites or Cu nanocrystalline dendrites. In detail, SERS substrates with mass ratio of 30.1% copper exhibit better Raman activity than that with a copper mass ratio of 13.2% and 44.3%. The relationship between the enhanced performance and the morphology is revealed from the physical enhancement mechanism, which show that, denser the branch distribution of the nano dendrites is, better enhancing performance will be.
Keywords: SERS;AC electrodeposition;Au;Cu;dendrite
2018, 44(6): 78-82 收稿日期: 2017-12-30;收到修改稿日期: 2018-02-28
基金项目: 国家自然科学基金重点支持项目（51705354，61474079，61471255）；国家863项目（2015AA042601）；山西省基础研究计划项目（2015021092）
作者简介: 申治中(1993-),男,山西临汾市人,硕士研究生,专业方向为电子科学与技术。
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