4.7 Article

Unique high-performance metal-nanoparticle-free SERS substrate with rapid-fabricated hybrid 3D-Nano-Micro-Cavities anodic alumina for label-free detection

期刊

APPLIED SURFACE SCIENCE
卷 635, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.apsusc.2023.157731

关键词

Raman scattering; SERS; Rough surface; AAO; Nanofabrication; Micromachining

向作者/读者索取更多资源

A new type of SERS substrate is proposed, which does not require the use of metal nanoparticles. The substrate is fabricated by electrochemically micromachining aluminum foil to create a roughened surface with randomly-distributed 3D over-etched cavities and nanopores of anodized aluminum oxide (AAO). This SERS substrate demonstrates high analytical enhancement and low detection limit, making it suitable for rapid detection of substances such as methylene blue.
Conventional surface-enhanced Raman scattering (SERS) substrates were usually nanofabricated by coating Ag or Au metal nano particles (MNPs) to modify the surface. However, the complex and time-consuming nanofabrication prevents those good-performance substrates from the practical applications together with the instability of MNPs as a challenge. Here, a unique Roughened-Surface-with-hybrid-3D-Nano-Micro-Cavities (RS3DNMC) SERS substrate free of MNPs is proposed for high-performance enhancement using facile and rapid electrochemically micromachining aluminum foil to form randomly-distributed 3D over-etched cavities of 1 similar to 2 mu m in diameter embedded with the nanopores of anodized aluminum oxide (AAO). The metal-film-coated AAO with RS3DNMC structure creates great SERS enhancement because of two mechanisms from the significantly reduced reflectance for increasing the photonic-scattering-and-multi-reflection and the more peripheral-and-gap hotspots of 3D-nano-micro-cavities compared to the 2D flat surface. Our SERS substrate merits a high analytical enhancement factor (AEF) of 1.15x10(6) and a low limit of detection (LOD) of 1x10(-10) M for methylene blue (MB) with a good uniformity of 9.64% relative standard deviation (RSD) in a large area of 2.25 cm(2). The melamine widely remained in human body and environment was detected at LOD of 0.05 ppm that is much lower than WHO-recommended criteria (1 ppm).

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据