Micro-EDM method to fabricate three-dimensional surface textures used as SERS-active substrate
Micro-EDM method to fabricate three-dimensional surface textures used as SERS-active substrate
复制标题
微电火花加工方法制造用作 SERS 活性基底的三维表面纹理
DOI：
10.1016/j.apsusc.2018.07.132
复制
发表时间：
2018-11-15
影响因子：
6.7
通讯作者：
Tang, Jiajing
中科院分区：
文献类型：
--
作者：
Li, Zhengkai;Bai, Jicheng;Tang, Jiajing
Based on micro electrical discharge machining (micro-EDM) method, three-dimensional surface textures were fabricated by constituting arrayed paraboloid-shaped micro-cavities on a copper template, and these surface textures were intended for surface-enhanced Raman scattering (SERS) active substrate. By lowering discharge energy, the inherent discharge craters and bulges were limited to be in nanoscale, and thereby the fabricated surface texture could be characterized as a micro-nano hierarchical structure. Raman spectra were measured on fabricated surface textures using Rhodamine 6G as the probe molecule, and results showed that the characteristic peaks of R6G molecules can be successfully identified under a low concentration of 10(-7)M. In addition, the strongest Raman spectra intensity was observed on the surface texture that has the largest apparent area (S) per unit interval space (d) and per unit peak-to-valley height (ft). This is mainly attributed to the fact that the surface texture with larger S/(d x h) would adsorb more probe molecules and provide higher density of SERS hot-spots. As a whole, the fabricated surface textures exhibited good SERS performances by providing an enhancement factor of greater than 10(7). The works conducted in this study are expected to provide a novel thought to fabricate SERS-active substrate, and extend the application fields of micro-EDM technology as well.
