Adsorption Science & Technology (Jan 2023)

NO2 Gas Sensing Properties of Ag-Functionalized Porous ZnO Sheets

  • Min Young Kim,
  • Jeong Yun Hwang,
  • Ali Mirzaei,
  • Sun-Woo Choi,
  • Sang-il Kim,
  • Hyun-Sik Kim,
  • Sun-Jae Kim,
  • Jong Wook Roh,
  • Myung Sik Choi,
  • Kyu Hyoung Lee,
  • Seung Yong Lee,
  • Changhyun Jin

DOI
https://doi.org/10.1155/2023/9021169
Journal volume & issue
Vol. 2023

Abstract

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Herein, we report a simple and scalable synthesis route to prepare Ag-functionalized porous ZnO sheets and their enhanced NO2 gas sensing properties. Porous ZnO sheets functionalized with well-dispersed submicron Ag particles were prepared by using a hydrothermal method-based one-pot synthesis route from Zn and Ag precursors. NO2 gas sensing performance (response, selectivity, response time, and recovery time) was optimized at 200°C in the gas sensor fabricated with 3 at% Ag-functionalized porous ZnO sheets. We demonstrated a response (Rg/Ra) of 17.18 to 10 ppm NO2 gas and also obtained a high response of 14.05 even at 60% relative humidity due to the synergetic effect of improved NO2 gas adsorption in the presence of Ag particles and increased resistance by the formation of Schottky barrier at Ag-ZnO heterojunctions.