Selective, sensitive, and stable NO2 gas sensor based on porous ZnO nanosheets

Myung Sik Choi, Min Young Kim, Ali Mirzaei, Hyun Sik Kim, Sang il Kim, Seung Hyub Baek, Dong Won Chun, Changhyun Jin, Kyu Hyoung Lee

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)


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.

Original languageEnglish
Article number150910
JournalApplied Surface Science
Publication statusPublished - 2021 Dec 1

Bibliographical note

Funding Information:
This work was supported by Yonsei-KIST Convergence Research Program. This research was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2019R1A6A1A11055660). M. S. Choi was supported by the Korea Initiative for fostering the University of Research and Innovation (KIURI) Program of the National Research Foundation (NRF) funded by the Korean government (MSIT) (NRF-2020M3H1A1077207).

Publisher Copyright:
© 2021 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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