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A green, reusable SERS film with high sensitivity for in-situ detection of thiram in apple juice

2017; Elsevier BV; Volume: 416; Linguagem: Inglês

10.1016/j.apsusc.2017.04.159

1873-5584

Hongbao Sun, Hai Liu, Yiyong Wu,

Advanced biosensing and bioanalysis techniques

We report a green and reusable surface-enhanced Raman scattering (SERS) film based on PMMA/Ag NPs/graphene. By using this Raman substrate, the SERS signals of R6G were significantly enhanced reaching a minimum detectable concentration of 5 × 10−8 M, due to having lots of hot spots adhered backside to the exposed graphene. The SERS film can be used for in-situ monitoring of trace thiram in apple juice with a detection limit of 1 × 10−6 M (0.24 ppm), which is below the maximal residue limit (MRL) of 7 ppm in fruit prescribed by the U.S. Environmental Protection Agency (EPA). Furthermore, reusability studies show that the SERS film can be used repeatedly. In addition, the graphene-enhanced SERS technique shows great potential applications for the in-situ detection and identification of pesticide residues in environmental water, fruits and vegetables.