Hydrophobic Slippery Surface-Based Surface-Enhanced Raman Spectroscopy Platform for Ultrasensitive Detection in Food Safety Applications

Analytical Chemistry
Dongjie ZhangJixiang Fang

Abstract

Collecting highly diluted target analytes into specific hot spot regions is vital for ultrasensitive surface-enhanced Raman spectroscopy (SERS) applications. In this work, a hydrophobic slippery platform was employed as a concentrator to construct colloidal SERS-active substrates regardless of the diffusion limits during droplet evaporation. Within only 140 s, sufficient absorption between the analytes and colloidal Au nanoparticles (Au NPs) was observed by fluorescence imaging. This effect resulted in excellent SERS sensitivity and stability. Compared with the common metal colloid-based SERS substrates, e.g., drying on a silicon wafer or detection in colloidal solutions, this preconcentrated method showed lower detection limits and the lowest detection concentration of crystal violet molecule down to 10-12 M with a portable Raman spectrometer. Such high signal enhancement was mainly ascribed to the condensation effect of Au colloids/analytes on the hydrophobic slippery substrate, by which almost all probe molecules were guided into the "hot spot" regions of aggregated Au NPs. Using the SERS platform, various illegal additives in realistic food and health-care products, for example, malachite green (1 ppb) added in fish and mor...Continue Reading

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Citations

Aug 11, 2020·Critical Reviews in Food Science and Nutrition·Yahui GuoAbdu Mahmud
May 27, 2020·Nature Communications·Dongjie ZhangJixiang Fang
Nov 4, 2020·Nanomedicine·Ting LinTing-Ting Zeng
Jan 19, 2021·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Zhongshun WangNan Lu
Dec 17, 2020·Comprehensive Reviews in Food Science and Food Safety·Yiqun HuangBarbara A Rasco
May 19, 2020·ACS Applied Materials & Interfaces·Lin GuoSatish Kumar
Oct 13, 2021·Luminescence : the Journal of Biological and Chemical Luminescence·Wanli FanMeikun Fan

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