Abstract
The development of NO2 gas sensor with high sensitivity, low detection limit and high selectivity is highly required. This article reports a NO2 gas sensor based on Co3O4/In2O3 heterojunction structure fabricated by a two-step hydrothermal method. Particularly, morphological and structural analysis of the Co3O4 nanorods/In2O3 nanocubes nanocomposite was examined by SEM, TEM, XRD, EDS and XPS measurements. The Co3O4/In2O3 nanocomposite sensor was tested toward NO2 gas (1–200 ppm) under different operation temperature. The sensor exhibited excellent gas sensing properties for NO2 sensing at an optimal temperature of 150 °C. The corresponding response is 27.9 to 10 ppm NO2 at 150 °C, 1.2 times higher than that of pure In2O3 and 10 times higher than that of pure Co3O4. Moreover, the Co3O4/In2O3 sensor shows sub-ppm level detection ability, good selectivity and long-term stability at low temperature. The enhanced sensing performance can be attributed to the Co3O4/In2O3 heterojunction structure formed at the interfaces of n-type In2O3 nanocubes and p-type Co3O4 nanorods.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Materials Science: Materials in Electronics
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
