Preparation and performance study of AgNPs@PDMS nanobowl array SERS substrate
A flexible surface-enhanced Raman scattering(SERS)substrate with a nano-bowl array structure was constructed and used for the analysis and detection of Rhodamine 6G and thiram.First,a single-layer polystyrene(PS)microsphere film was prepared on a glass slide using the gas-liquid self-assembly method.Then,the single-layer silver nanoparticles obtained by the liquid-liquid interface self-assembly method were transferred to the PS mi-crosphere film.Subsequently,polydimethylsiloxane(PDMS)was coated on the silver nanoparticles.After drying and peeling,an AgNPs@PDMS nanobowl array substrate was obtained.Using a portable Raman spectrometer to test this substrate with Rhodamine 6G as the probe molecule,the detection limit was found to be 1×10-8 mol/L,with an en-hancement factor of 4.32×105.The test results also showed that the substrate has high uniformity and reusability.U-sing thiram as the probe molecule,the detection limit was as low as 1×10-6 mol/L.The relationship between the Ra-man peak intensity of thiram and its concentration was studied,and the results showed that the substrate can achieve quantitative detection of thiram.
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