(AGENPARL) – LONDON (UNITED KINGDOM), gio 02 luglio 2020
Abstract Detection of pesticide residues from fruits and vegetables is of significant importance to ensuring human health and environmental safety. An efficient and tunable shape-selective synthesis of Ag/CeO2 nanostructures as active flexible SERS substrates for the detection of thiram on apple surface via paste, peel off, and paste again process was performed. Well-controlled formation of silver assembled CeO2 microspheres constituting nanospheres and nanospindles with an average size of ~56 and 32 nm with anisotropic structures have been confirmed through morphological and crystallographic analysis. Interestingly, CeO2 (111) was strongly anchored in the Ag (111) matrix, which provides a more adequate pathway for the rapid ion-electron transportation, as observed from the structure and chemical composition analysis. The detection of thiram on apple surface, by our proposed nanospindles SERS active substrate, achieves a wide detection range from 10-2 M to 10-9 M with a correlation coefficient of 0.9929 and a low detection limit of 27 nM at S/N=3. Meanwhile, the charge transfer mechanism between Ag/ CeO2 nanostructures and thiram molecules has also been proposed. We believe, the present work would open a new idea to develop SERS active substrates for high efficient onside detection of pesticide on fruits shortly.
This article is Open Access