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<p>In this work, ZnO nanosheets were prepared with different precursor concentrations by a simple hydrothermal method. ZnO nanosheets were prepared with Zn(NO<sub>3</sub>)<sub>2</sub>.6H<sub>2</sub>O as the precursor, NaOH as the precipitant and the deionized water as the solvent. The products were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), energy disperse spectroscopy (EDS) and photoluminescence (PL) spectrum. The grain boundary potential barrier (GBPB) was tested by conductive atomic force microscope (CAFM). Their gas sensing performance were investigated under different precursor concentrations, atmospheres and working temperatures. The ZnO nanosheets-based gas sensor showed high sensitivity and selectivity to ethanol at the optimal operating temperature of 250 ℃. The gas sensing mechanism conforms to the GBPB model.</p>

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Highly sensitive and selective ethanol gas sensor based on ZnO nanosheets: the effect of grain boundary potential barrier

  • 期刊论文

  • 发表日期：

    2026年5月14日

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  • Yidong Zhang,
  • Lei Zhao,
  • Zhenwei Dong,
  • Huijuan Guan

摘要

In this work, ZnO nanosheets were prepared with different precursor concentrations by a simple hydrothermal method. ZnO nanosheets were prepared with Zn(NO3)2.6H2O as the precursor, NaOH as the precipitant and the deionized water as the solvent. The products were analyzed by X-ray diffraction (XRD), scanning electron microscope (SEM), energy disperse spectroscopy (EDS) and photoluminescence (PL) spectrum. The grain boundary potential barrier (GBPB) was tested by conductive atomic force microscope (CAFM). Their gas sensing performance were investigated under different precursor concentrations, atmospheres and working temperatures. The ZnO nanosheets-based gas sensor showed high sensitivity and selectivity to ethanol at the optimal operating temperature of 250 ℃. The gas sensing mechanism conforms to the GBPB model.