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A silver nanoislands on silica spheres platform: enriching trace amounts of analytes for ultrasensitive and reproducible SERS detection.

Nanoscale (2017-10-27)
Zhongshun Wang, Lei Feng, Dongyang Xiao, Ning Li, Yao Li, Danfeng Cao, Zuosen Shi, Zhanchen Cui, Nan Lu
ABSTRACT

The performance of surface-enhanced Raman scattering (SERS) for detecting trace amounts of analytes depends highly on the enrichment of the diluted analytes into a small region that can be detected. A super-hydrophobic delivery (SHD) process is an excellent process to enrich even femtomolar analytes for SERS detection. However, it is still challenging to easily fabricate a low detection limit, high sensitivity and reproducible SHD-SERS substrate. In this article, we present a cost-effective and fewer-step method to fabricate a SHD-SERS substrate, named the "silver nanoislands on silica spheres" (SNOSS) platform. It is easily prepared via the thermal evaporation of silver onto a layer of super-hydrophobic paint, which contains single-scale surface-fluorinated silica spheres. The SNOSS platform performs reproducible detection, which brings the relative standard deviation down to 8.85% and 5.63% for detecting 10

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
1H,1H,2H,2H-Perfluorooctyltriethoxysilane, 98%