Sik, Choi M. Young, Kim M. Mirzaei, A. Kim, H.-S. Kim, S.-I. Baek, S.-H. Chun, Dong Won Jin, C. Hyoung, Lee K. 2024-01-19T13:04:38Z 2024-01-19T13:04:38Z 2021-10-21 2021-12 0169-4332 https://pubs.kist.re.kr/handle/201004/116026 In this study, we synthesized porous (porosity: ~16%, average pore size: ~60 nm) ZnO nanosheets (thickness: ~80 nm) using a conventional solvothermal method to investigate NO2 gas sensing properties. Porous ZnO nanosheets triggered the detection of NO2 gas with high sensitivity. Responses of 2.93 ？ 0.5 ppm and 74.68 ？ 10 ppm NO2 gas at 200 °C were observed in the porous ZnO nanosheet-based gas sensor. In addition, improved sensing properties with high selectivity to NO2 gas, reasonable stability, and high response even in the presence of water vapor molecules were obtained. We found that the enhanced NO2 gas response of the porous ZnO nanosheet-based gas sensor was due to the synergetic effects of the high surface area, ZnO/ZnO homojunctions, and structural defects. We developed a highly sensitive NO2 gas sensor with improved reliability using morphologically engineered ZnO, which was prepared via a simple and scalable chemical-synthesis route. ？ 2021 Elsevier B.V. English Elsevier B.V. Selective, sensitive, and stable NO2 gas sensor based on porous ZnO nanosheets Article 10.1016/j.apsusc.2021.150910 1 Applied Surface Science, v.568 Applied Surface Science 568 N scie scopus 000712302200006 2-s2.0-85113273961 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article Chemical sensors Gas detectors Nanosheets Nitrogen oxides Pore size Zinc oxide Gas sensing properties Gas-sensors NO $-2$ NO2 gas Porous ZnO nanosheet Sensing mechanism Solvothermal method Synthesised ZnO ZnO nanosheets II-VI semiconductors Gas sensor NO2 gas Porous ZnO nanosheet Sensing mechanism