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Electrochemical sensing based on Au particle@SiO2@CQDs nanocomposites

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Abstract

In this study, carbon quantum dots (CQDs) were first synthesized using a hydrothermal method, and then, Au@SiO2 core-shell nanomaterials were synthesized using layer-by-layer assembly. CQDs were adsorbed on the surface of Au@SiO2 nanoparticles through self-assembly to form Au@SiO2/CQDs nanocomposite materials. Transmission electron microscopy and X-ray diffraction were used to characterize the size, shape, element composition, and structure of nanocomposites; ultraviolet-visible absorption spectroscopy and fluorescence spectroscopy were used to analyze the optical properties of nanocomposites. The results show that Au@SiO2/CQD nanomaterials have a core-shell structure with good morphology and exhibit excellent luminescence characteristics. The electrochemical performance of nanocomposites was characterized using electrochemical means, and a hydrogen peroxide sensor was constructed for the sensitive detection of hydrogen peroxide, thus realizing the rapid and sensitive detection of hydrogen peroxide at levels as low as 0.2 mM. The electrode GCE modified with Au@SiO2/CQDs exhibits good selectivity and stability in the detection of hydrogen peroxide.

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Data availability

The data that support the findings of this study are openly available.

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Funding

This work was financially supported by the National Natural Science Foundation of China (51702006, 22002002), Shaanxi provincial science and technology planning project (2018JQ2056), the Youth Science and Technology New Star Plan of Shaanxi Province] grant number (2021KJXX-50), the Phytochemistry Key Laboratory of Shaanxi Province (NO.18JS007), and the Natural Science Foundation of Shaanxi Province (2023JCYB120).

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Authors and Affiliations

  1. Department of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji, 721013, Shaanxi, China

    Huiqin Li, Hui Lei, Cui Deng, Fan Huang, Lijun Ren, Hongge Zhang & Weiwei Zhao

  2. Hebei Construction Material Vocational and Technical College, Qinhuangdao, 066004, Hebei, China

    Lihua Wu

  3. Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Simulation, Baoji University of Arts and Sciences, Baoji, 721013, Shaanxi, China

    Qian Zhao

Authors
  1. Huiqin Li
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  2. Lihua Wu
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  3. Hui Lei
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  4. Cui Deng
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  5. Fan Huang
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  6. Lijun Ren
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  7. Hongge Zhang
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  8. Weiwei Zhao
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  9. Qian Zhao
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Contributions

Li H and Wu L proposed the research and guided the project. Deng C and Huang F designed and performed the experiments. Lei H and Ren Li analyzed and discussed the experimental results, Zhang H prepared Figs. 8, 9, and 10; Zhao W and Zhao Q were responsible for stability and selectivity experiments. Li H and Deng C drafted the manuscript. All the authors reviewed and approved the manuscript.

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Correspondence to Huiqin Li or Lihua Wu.

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Li, H., Wu, L., Lei, H. et al. Electrochemical sensing based on Au particle@SiO2@CQDs nanocomposites. Gold Bull 56, 145–155 (2023). https://doi.org/10.1007/s13404-023-00329-z

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  • DOI: https://doi.org/10.1007/s13404-023-00329-z

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