Abstract
Silver nanocubes monolayer-modified polydimethylsiloxane (Ag NC/PDMS) flexible SERS substrates have been prepared by a three-phase interface self-assembly procedure. The combination of this method with membrane technology brings nanoparticles in close proximity, densely, and regularly arranged in monolayers over a large area, leading to excellent SERS properties. Considering the complexity of practical detection, molecular imprinted polymers (MIPs) were anchored on the surface of SERS substrate and applied to selective detection of microcystin-LR (MC-LR). It is worth mentioning that the SERS imprinted membranes (AP-MIMs) were still clearly detected at a concentration of 0.1 µg·L−1 of MC-LR in drinking water, and the detection limit was as low as 0.0067 µg·L−1. The substrate exhibited excellent uniformity with a relative standard deviation (RSD) of 6.1%. In the presence of interference molecules, AP-MIMs exhibited excellent selectivity for MC-LR. Furthermore, in the spiking and recovery tests of practical lake water samples, the method showed excellent recoveries ranging from 96.47 to 105.31%. It has been demonstrated that the prepared AP-MIMs can be applied to sensitive and specific detection of trace amounts of MC-LR in drinking water.
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Funding
This work is supported by the National Natural Science Foundation (No. 21906062), the Natural Science Foundation Project of Jilin Province (YDZJ202201ZYTS356, YDZJ202101ZYTS073), and the Project of Education Department of Jilin Province (JJKH20230807CY, JJKH20230508KJ, JJKH20220431KJ).
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Wang, Z., Zhang, L., Sun, L. et al. Self-assembly flexible SERS imprinted membrane based on Ag nanocubes for selective detection of microcystin-LR. Microchim Acta 191, 19 (2024). https://doi.org/10.1007/s00604-023-06096-0
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DOI: https://doi.org/10.1007/s00604-023-06096-0