A balsam pear-shaped CuO SERS substrate with highly chemical enhancement for pesticide residue detection
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ORIGINAL PAPER
A balsam pear-shaped CuO SERS substrate with highly chemical enhancement for pesticide residue detection Pei Liang 1 & Yu Cao 1 & Qianmin Dong 1 & Dan Wang 1 & De Zhang 2 & Shangzhong Jin 1 & Zhi Yu 2 & Jiaming Ye 3 & Mingqiang Zou 4,5 Received: 14 January 2020 / Accepted: 27 April 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract Simple and traditional hydrothermal fabrication of a novel balsam pear-shaped CuO with high SERS enhancement is presented. XRD (X-ray diffraction), SEM (scanning electronic microscopy), TEM (transmission electron microscope), HRTEM (highresolution transmission electron microscope), UV-Vis, and Raman are adopted to ensure that this balsam pear-shaped CuO with dense nanoparticle protuberance is successfully prepared. The LOD of this CuO SERS substrate is 4.79 μg L−1 with R6G as molecular probe. By using DFT (density functional theory) calculation and FDTD (finite difference time domainmethod) simulation, both EM (electromagnetic enhancement) and CM (chemical enhancement) mechanisms are investigated, and the results show that these two-enhancement mechanisms can coexist in this balsam pear-shaped CuO. Finally, the prepared substrate has been applied for the determination of trace levels of paraquat in solution , and results show that its LOD for paraquat is 275 μg L−1 (optimum Raman band: 1646 cm−1 Raman shift), which is better than the government standard in China. A dexterous and facile way for fabrication of CuO SERS-active substrates with low cost and high performance, quite promising in detection of chemically hazardous substances and pesticide residue is provided.
Keywords Balsam pear-shaped CuO . Facile hydrothermal method . Synergistic effect . Pesticide residue . Surface-enhanced Raman scattering (SERS)
Introduction Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04303-w) contains supplementary material, which is available to authorized users. * Pei Liang [email protected] * Qianmin Dong [email protected] 1
College of Optical and Electronic Technology, China Jiliang University, Hangzhou 310018, China
2
College of Horticulture & Forestry Sciences, Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan 430070, China
3
Analysis and Testing Center, Yangtze Delta Region Institute of Tsinghua University, Jiaxing 314006, China
4
Chinese Academy of Inspection and Quarantine (CAIQ), No.A 3, Gaobeidian Road, Chaoyang District, Beijing 100123, China
5
China Inspection Laboratory Technologies Co. Ltd (CILT), No.A 3, Gaobeidian Road, Chaoyang District, Beijing 100123, China
Surface-enhanced Raman spectroscopy (SERS) discovered by Fleischmann et al. in 1974 has been a powerful and non-contact determination technique and later involved in the advanced spectrum analytical fields [1], with its outstanding performance in detection of organic and biological molecules, identification of reaction intermediates, and detection of trace su
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