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<p>In this study, we demonstrate the multifunctional property of a nanocomposite (NC) synthesized by combining Ag-doped ZnO with graphene oxide (GO) nanosheets. The Ag-ZnO/GO NC works as an efficient photocatalyst to remove methylene blue (MB) dye (a common water pollutant) from water, and functions also as a good sensing material to detect relative humidity (RH) of air. X-ray diffraction confirmed hexagonal wurtzite crystal structure of ZnO whereas scanning and transmission electron microscopies revealed the successful integration of Ag-ZnO nanoparticles (NPs) onto GO sheets forming well-defined NC. The optimized Ag-ZnO/10%GO NC (AZO-10%GO NC) exhibited 98.95% degradation efficiency for MB dye under sunlight within just 40&#xa0;min, a remarkably improved performance compared to only 82.99% degradation by pure ZnO NPs. Interestingly, the same Ag-ZnO/10%GO NC also exhibits a high sensing response of ~ 406 at 74% RH along with fast response and recovery times of 7&#xa0;s and 21&#xa0;s, respectively when tested as a chemi-resistive film to sense RH of air. Thus, this work demonstrates the utility of the Ag-ZnO/10%GO NC for both water and air quality monitoring as it can not only remove organic pollutants from water bodies but also can monitor RH of air.</p>

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Large enhancement in humidity sensing performance and photocatalytic efficiency of Ag-doped ZnO/GO nanocomposites

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月21日

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  • Vaishali Amrute,
  • Kousik Bhunia,
  • Supin Karonnan Koroth,
  • M. Vasundhara,
  • Amit K. Chakraborty,
  • Anupama Chanda

摘要

In this study, we demonstrate the multifunctional property of a nanocomposite (NC) synthesized by combining Ag-doped ZnO with graphene oxide (GO) nanosheets. The Ag-ZnO/GO NC works as an efficient photocatalyst to remove methylene blue (MB) dye (a common water pollutant) from water, and functions also as a good sensing material to detect relative humidity (RH) of air. X-ray diffraction confirmed hexagonal wurtzite crystal structure of ZnO whereas scanning and transmission electron microscopies revealed the successful integration of Ag-ZnO nanoparticles (NPs) onto GO sheets forming well-defined NC. The optimized Ag-ZnO/10%GO NC (AZO-10%GO NC) exhibited 98.95% degradation efficiency for MB dye under sunlight within just 40 min, a remarkably improved performance compared to only 82.99% degradation by pure ZnO NPs. Interestingly, the same Ag-ZnO/10%GO NC also exhibits a high sensing response of ~ 406 at 74% RH along with fast response and recovery times of 7 s and 21 s, respectively when tested as a chemi-resistive film to sense RH of air. Thus, this work demonstrates the utility of the Ag-ZnO/10%GO NC for both water and air quality monitoring as it can not only remove organic pollutants from water bodies but also can monitor RH of air.