Gold Nanostructures with Superhydrophobic to Superhydrophilic Wetting Transition and Tunable SERS Applications Prepared by Galvanic Displacement

2018 International Conference on Advanced Materials, Intelligent Manufacturing and Automation

材料科学;机械制造;运输工程

Cao, Wei^1

Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing

100081, China^1

关键词: Enhancement factor;    Galvanic displacement;    Gold nanostructures;    Micro/nanostructures;    Solution concentration;    Super-hydrophilic;    Water contact angle;    Wetting transitions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/382/2/022026/pdf
DOI  :  10.1088/1757-899X/382/2/022026

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Various gold micro/nanostructures have been demonstrated to have the superhydrophobic property. Herein, we propose a simple method to fabricate gold micro/nanostructures on n-silicon (100) substrates by the galvanic displacement. The morphology of the resulting substrates could be well controlled by the deposition time and solution concentration. The prepared substrates can achieve superhydrophobic to superhydrophilic wetting transition. The water contact angle of the prepared substrates could be controlled from 0° to 150 ° without any chemical modification. The mechanism for superhydrophobic to superhydrophilic wetting transition was discussed. Besides, the gold micro/nanostructures also exhibited highly sensitive Raman signals, with the enhancement factors of the substrates reaching up to ∼ 107 at optimal deposition time.