A magnetic drive self-assembly recyclable FA / Ag / PDMS cavity array SERS substrate, a preparation method thereof and methyl mercury detection application

Abstract

The present application belongs to the technical field of surface enhanced Raman spectroscopy sensing and environmental pollutant detection, and particularly relates to a magnetic driving self-assembled recyclable FA / Ag / PDMS cavity array SERS substrate, a preparation method thereof and a methylmercury detection application. The present application constructs a particle-cavity composite structure, simultaneously generates a volume hot spot and a surface hot spot, and the signal of the detection unit is uniform; the present application has two sets of recycling modes of PDMS template reuse and magnetic particle regeneration, and eliminates the defects of poor batch reproducibility of traditional SERS substrates; the present application realizes indirect recognition of methylmercury by using 4-MPY, and combines digital SERS to calculate the proportion of positive cavity units, so that the detection limit of methylmercury can reach 10 ‑11 M; the anti-interference ability to humus, suspended particles and soluble salts is strong, and the present application can be directly used for accurate quantitative detection of ultratrace methylmercury in real environmental water samples of lakes and seawater, and is suitable for environmental on-site monitoring.

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