Department of Optics and Optical Engineering & Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China. College of Physics and Electronics Information, Anhui Normal University, Wuhu, Anhui 241000, People's Republic of China.
Nanotechnology. 2017 Sep 20;28(38):385401. doi: 10.1088/1361-6528/aa7a4d. Epub 2017 Jun 19.
Large-area ordered arrays with dense hotspots are highly desirable substrates for surface enhanced Raman scattering (SERS). In this paper, we present a quasi-3D SERS substrate of free-standing Ag triangle arrays (FATA) which was fabricated by nanosphere lithography incorporated with photolithography and Ag covering. A significant SERS effect arises from a strongly enhanced local electric field within the tiny gaps between the suspended Ag triangle and the Ag baseplate. The SERS intensity relative standard deviation is less than 7.6%, leading to excellent reliability for Raman detection. The simple fabrication of the Ag film covering FATA nanostructures provides a practical solution for large-area, highly efficient and reproducible SERS substrates.
大面积有序且热点密集的阵列是表面增强拉曼散射（SERS）的理想衬底。本文提出了一种由独立式银三角阵列（FATA）组成的准 3D SERS 衬底，其通过纳米球光刻结合光刻和银覆盖来制备。由于悬空银三角与银基底之间的微小间隙内存在强烈增强的局域电场，因此会产生显著的 SERS 效应。相对标准偏差的 SERS 强度小于 7.6%，为拉曼检测提供了出色的可靠性。FATA 纳米结构的银膜覆盖的简单制造为大面积、高效和可重复的 SERS 衬底提供了实用的解决方案。
