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Silver Nanoislands over Silica Spheres Platform: Enriching Trace-Amount Analytes for Ultrasensitive and Reproducible SERS Detections

Abstract

The performance of surface-enhanced Raman scattering (SERS) for detecting trace amount of analytes depends much on the enrichment of the diluted analytes into a small region that can be detected. Super-hydrophobic delivery (SHD) process is of an excellent capability to enrich even femtomolar analytes for SERS detection. However, it is still challenging to easily fabricate a low detection limit, high sensitivity and reproducibility SHD-SERS substrate. In this article, we present a cost-effective and less-step method to fabricate a SHD-SERS substrate named the "silver nanoislands over silica spheres" (SNOSS) platform. It is easily prepared by 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 makes the relative standard deviation for 10-8 M R6G down to 8.85% and 5.63% for detecting in one spot and spot-to-spot, respectively. The coefficient of determination (R2) is 0.9773 for R6G. The SNOSS platform can be applied for quantitative detection for analytes whose concentration ranges from sub-micromolar to femtomolar level.

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Publication details

The article was accepted on 10 Oct 2017 and first published on 11 Oct 2017


Article type: Paper
DOI: 10.1039/C7NR06987A
Citation: Nanoscale, 2017, Accepted Manuscript
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    Silver Nanoislands over Silica Spheres Platform: Enriching Trace-Amount Analytes for Ultrasensitive and Reproducible SERS Detections

    Z. Wang, L. Feng, D. Xiao, N. Li, Y. Li, D. Cao, Z. Shi, Z. Cui and N. Lu, Nanoscale, 2017, Accepted Manuscript , DOI: 10.1039/C7NR06987A

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