Journal
NANOSCALE
Volume 11, Issue 27, Pages 12829-12836Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr02851j
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Funding
- National Natural Science Foundation of China [21507124, 51578525, 5153000136]
- Natural Science Foundation of Fujian Province [2015J05036]
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We have demonstrated a one-step approach for the fabrication of flexible, robust, reproducible and freestanding SERS substrates (AuNPs/polyvinyl chloride (PVC) film) through a polymer induced interfacial self-assembly method. In this method, the polymer (PVC) plays dual roles, that is, inducing the interfacial self-assembly of nanoparticles and fixing the assembled nanostructure in the PVC matrix. As the assembled nanoparticles are orderly half-embedded in the PVC film, the AuNPs/PVC film exhibits outstanding reproducibility and stability. In addition, the film could be easily regenerated by rinsing with NaBH4 solution. As a proof of concept, the film was directly wrapped on an apple surface for in situ detection of pesticide residues, and a detection limit of 10 ng cm(-2) thiram was achieved. Furthermore, rapid on-site and in situ detection of multi-pesticide residues has been proved to be feasible with the aid of a portable Raman spectrometer. Due to its simple preparation, good reliability, outstanding stability and reusability, the AuNPs/PVC film has great potential in practical applications.
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