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<p>The water molecules present in the atmosphere considerably influence the gas-sensing performance of semiconducting metal oxide (SMO)-based gas sensors, interacting with oxygen ions on the surface of SMO or adsorbing directly on the sensing layer. Hence, the sensing performance of SMO-based sensors can be significantly deteriorated by preventing target gas molecules from interacting with ionized oxygen and decreasing the adsorption sites of the target gas molecules. In this study, humidity-immune ZnO nanofiber (NF)-based gas sensors were successfully fabricated via Ag loading and pre-exposure to humid air. Although the ethanol (C<sub>2</sub>H<sub>5</sub>OH) response of Ag-loaded ZnO NFs toward 20 ppm at 300 °C deteriorated by approximately 41% after pre-exposure to 91% relative humidity (RH), a stable and consistent C<sub>2</sub>H<sub>5</sub>OH response characteristic was attained under humid conditions irrespective of humidity levels ranging from 0 to 83% RH. In addition, the sensor fabricated in this study exhibited high selectivity for C<sub>2</sub>H<sub>5</sub>OH molecules because of the catalytic effect of noble Ag particles loaded in ZnO NFs. Based on the role of catalytic Ag particles and the effect of pre-exposure to humid air, the sensing mechanisms related to the C<sub>2</sub>H<sub>5</sub>OH selectivity and humidity independence of Ag-loaded ZnO NFs are discussed in detail.</p>

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A facile approach for humidity-immune C2H5OH sensor based on Ag-loaded ZnO nanofibers

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Myung Sik Choi,
  • Jungkeun Lee,
  • Byeonggi Lee,
  • Jimyeong Park,
  • Changhyun Jin,
  • Sun-Woo Choi

摘要

The water molecules present in the atmosphere considerably influence the gas-sensing performance of semiconducting metal oxide (SMO)-based gas sensors, interacting with oxygen ions on the surface of SMO or adsorbing directly on the sensing layer. Hence, the sensing performance of SMO-based sensors can be significantly deteriorated by preventing target gas molecules from interacting with ionized oxygen and decreasing the adsorption sites of the target gas molecules. In this study, humidity-immune ZnO nanofiber (NF)-based gas sensors were successfully fabricated via Ag loading and pre-exposure to humid air. Although the ethanol (C2H5OH) response of Ag-loaded ZnO NFs toward 20 ppm at 300 °C deteriorated by approximately 41% after pre-exposure to 91% relative humidity (RH), a stable and consistent C2H5OH response characteristic was attained under humid conditions irrespective of humidity levels ranging from 0 to 83% RH. In addition, the sensor fabricated in this study exhibited high selectivity for C2H5OH molecules because of the catalytic effect of noble Ag particles loaded in ZnO NFs. Based on the role of catalytic Ag particles and the effect of pre-exposure to humid air, the sensing mechanisms related to the C2H5OH selectivity and humidity independence of Ag-loaded ZnO NFs are discussed in detail.