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A balsam pear-shaped CuO SERS substrate with highly chemical enhancement for pesticide residue detection

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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 (high-resolution 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.

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Acknowledgments

My gratitude also goes to Dr. Liang for his support of National Demonstration Base for Micro/Nano-Fabrication and Optoelectronic Detection and International Science and Technology Cooperation, as well as to Miss Zhu Wanying for her careful revision of my paper.

Funding

This paper is financially supported by Development and application of multi-parameter and non-destructive testing instrument for cross-border goods, under National Key R&D Program of China (No. 2017YFF0108900). This project is also financially supported by Fundamental Research Funds for the Central Universities(Program No.2662017JC035), Preeminence Youth Science Funds of Zhejiang Province (No.LR19F050001), National Science Foundation for Young Scholars of China (Grant No.31000316), Application Research Program of Commonweal Technology of Zhejiang Province (No. 2014C37042), Zhejiang province university students in scientific and technological innovation activities (No. 2016R409011), Science and technology project of Zhejiang Province (No. 2016C33026), and National Key Research and Development Program project (No. 2017YFD040800).

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Authors and Affiliations

  1. College of Optical and Electronic Technology, China Jiliang University, Hangzhou, 310018, China

    Pei Liang, Yu Cao, Qianmin Dong, Dan Wang & Shangzhong Jin

  2. College of Horticulture & Forestry Sciences, Key Laboratory of Horticultural Plant Biology, Ministry of Education, Huazhong Agricultural University, Wuhan, 430070, China

    De Zhang & Zhi Yu

  3. Analysis and Testing Center, Yangtze Delta Region Institute of Tsinghua University, Jiaxing, 314006, China

    Jiaming Ye

  4. Chinese Academy of Inspection and Quarantine (CAIQ), No.A 3, Gaobeidian Road, Chaoyang District, Beijing, 100123, China

    Mingqiang Zou

  5. China Inspection Laboratory Technologies Co. Ltd (CILT), No.A 3, Gaobeidian Road, Chaoyang District, Beijing, 100123, China

    Mingqiang Zou

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  1. Pei Liang
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Liang, P., Cao, Y., Dong, Q. et al. A balsam pear-shaped CuO SERS substrate with highly chemical enhancement for pesticide residue detection. Microchim Acta 187, 335 (2020). https://doi.org/10.1007/s00604-020-04303-w

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