Bai Shi, Du Yongjun, Wang Chunyan, Wu Jian, Sugioka Koji
Institute of Laser Engineering, Beijing University of Technology, 100 Pingle Yuan, Beijing 100124, China.
Advanced Laser Processing Research Team, RIKEN Center for Advanced Photonics, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.
Nanomaterials (Basel). 2019 Oct 28;9(11):1531. doi: 10.3390/nano9111531.
Surface-enhanced Raman spectroscopy (SERS) has advanced over the last four decades and has become an attractive tool for highly sensitive analysis in fields such as medicine and environmental monitoring. Recently, there has been an urgent demand for reusable and long-lived SERS substrates as a means of reducing the costs associated with this technique To this end, we fabricated a SERS substrate comprising a silicon nanowire array coated with silver nanoparticles, using metal-assisted chemical etching followed by photonic reduction. The morphology and growth mechanism of the SERS substrate were carefully examined and the performance of the fabricated SERS substrate was tested using rhodamine 6G and dopamine hydrochloride. The data show that this new substrate provides an enhancement factor of nearly 1 × 10. This work demonstrates that a silicon nanowire array coated with silver nanoparticles is sensitive and sufficiently robust to allow repeated reuse. These results suggest that this newly developed technique could allow SERS to be used in many commercial applications.
表面增强拉曼光谱（SERS）在过去四十年中取得了进展，已成为医学和环境监测等领域高灵敏度分析的一种有吸引力的工具。最近，迫切需要可重复使用且寿命长的SERS基底，以降低与该技术相关的成本。为此，我们使用金属辅助化学蚀刻，然后进行光子还原，制备了一种由涂覆有银纳米颗粒的硅纳米线阵列组成的SERS基底。仔细研究了SERS基底的形态和生长机制，并使用罗丹明6G和盐酸多巴胺测试了所制备的SERS基底的性能。数据表明，这种新基底提供了近1×10的增强因子。这项工作表明，涂覆有银纳米颗粒的硅纳米线阵列灵敏且足够坚固，能够重复使用。这些结果表明，这种新开发的技术可使SERS用于许多商业应用。
