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Cu2+-Assisted Synthesis of Au@AgI Core/Shell Nanorods via In Situ Oxidation of Iodide: A Strategy for Colorimetric Iodide Sensing

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Abstract

Colorimetric nanoprobes are frequently employed to construct sensitive sensors via various strategies. In this work, a novel strategy for simple and ultrasensitive sensing of iodide (I−) was constructed based on Cu2+-assisted generation of Au@AgI core/shell nanorods (NRs), by etching silver-coated gold nanorods (Ag@Au NRs). Ag@Au NRs were first prepared and characterized with UV–visible spectroscopy, transmission electron microscopy, high-angle annular dark-field scanning transmission electron microscopy, and energy-dispersive X-ray spectroscopy before and after iodide treatment. The mechanism of detection was based on the generation of AgI shells via etching Ag shells by I2, which was produced from the oxidation of I− with Cu2+, resulting in the peak shift of localized surface plasmon resonance (LSPR) while the color changed from green, blue to light-violet. The red-shift of the longitudinal LSPR peak had a linear relationship with I− concentration in the range of 0–50 μmol/L with a correlation coefficient of 0.982. Furthermore, the proposed method was used for the quantitative detection of I− in real samples and outstanding recoveries in the range of 91–106% with relative standard deviations lower than 2.5% were observed.

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Acknowledgements

This study was supported by the National Natural Science Foundation of China (21876206 and 21904055) and the Nature Science Foundation of Fujian Province (2021H6033, 2020J05164).

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Author notes

  1. Zhi-Xiong Cai and Yu-Zhu Chen contributed equally to this work.

Authors and Affiliations

  1. College of Chemistry and Environment, Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou, 363000, China

    Zhi-Xiong Cai, Qiao-Wen Zheng, Fei-Ming Li & Mao-Sheng Zhang

  2. College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China

    Yu-Zhu Chen, Benjamin Edem Meteku & Jing-Bin Zeng

  3. Department of Chemistry and the MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China

    Xi Chen

Authors
  1. Zhi-Xiong Cai
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  2. Yu-Zhu Chen
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  3. Benjamin Edem Meteku
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  4. Qiao-Wen Zheng
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  5. Fei-Ming Li
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  6. Mao-Sheng Zhang
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  8. Xi Chen
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Corresponding authors

Correspondence to Mao-Sheng Zhang or Jing-Bin Zeng.

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The authors declare no competing financial interest.

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Cai, ZX., Chen, YZ., Meteku, B.E. et al. Cu2+-Assisted Synthesis of Au@AgI Core/Shell Nanorods via In Situ Oxidation of Iodide: A Strategy for Colorimetric Iodide Sensing. J. Anal. Test. 6, 374–381 (2022). https://doi.org/10.1007/s41664-022-00221-3

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  • DOI: https://doi.org/10.1007/s41664-022-00221-3

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