Synthesis of silver nanoplates on electrospun fibers via tollens reaction for SERS sensing of pesticide residues
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ORIGINAL PAPER
Synthesis of silver nanoplates on electrospun fibers via tollens reaction for SERS sensing of pesticide residues Dongyan Li 1
&
Yue Gu 1 & Yueqi Feng 1 & Xinrui Xu 1 & Meimei Wang 1 & Youlin Liu 2
Received: 7 July 2020 / Accepted: 18 August 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Silver nanoplates were for the first time synthesized on electrospun chitosan/polyethylene oxide (CS/PEO) fibers via tollens reaction. Ag nanoplates/CS/PEO fibers were used as the SERS-active substrates for quantitative evaluation of 2-naphthylthiol, with an enhancement factor (1.41 ± 0.07) × 106. The SERS-active substrates are flexible, stable, and easy for transportion and preservation, and act as the SERS platform for sensitive detection of the target. Thiram and thiabendazole as the representatives of pesticide residues were identified and detected by the Ag nanoplates/CS/PEO fibers, exhibiting linear response ranges from 10−11 to 10−7 M with a detection limit of 10−11 M. The Ag nanoplates/CS/PEO fibers meet the requirement of thiram detection in practical samples, such as apple, pear, tomato, and cucumber juices. The strategy revealed the feasibility of fabrication of Ag nanoplates on electrospun fibers via tollens reaction and SERS sensing of pesticides in real samples. Keywords Electrospun fibers . Silver nanoplates . Tollens reaction . SERS sensing . Pesticide residues
Introduction Surface-enhanced Raman scattering (SERS) is a surfacesensitive technique for identification and the detection of chemical and biological analytes owing to its integration of unique spectroscopic fingerprint information, high sensitivity, and non-destructive data acquisition [1]. It greatly amplifies the Raman signals of analytes absorbed on or located in vicinity of active substrates by several orders of magnitude [2].
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04514-1) contains supplementary material, which is available to authorized users. * Dongyan Li [email protected] * Youlin Liu [email protected] 1
School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
2
College of Materials Science and Engineering, Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing 211816, China
Over the past decades, various SERS-active substrates such as noble metals and their nanostructures with the local surface plasmon resonance have been developed for the detection of analytes [3, 4]. Among them, the novel metal nanostructures or composites with high density of “hotspots” such as junctions or gaps are the merits of high-sensitive SERS substrates. Therefore, synthesis of nanomaterials with “hotspots” still is one of the pursuits of SERS-active substrates for ultrasensitive detection of targets. Electrospun fibers as self-supported matrixes for SERS sensors owned many merits, such as the uniformity, tunable porosity, large surface-to-volu
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