Abstract
Herein, the effect of the ZnO/WO3 molar ratio on the response of ZnO/WO3 composite nanoparticle (NP) sensors to CO is reported. For this purpose, NP samples with ZnO/WO3 molar ratios of 2:8, 4:6, 5:5, 6:4, and 8:2 are prepared using wet chemical methods. The strongest response to 200 ppm CO is obtained by the 6:4 ZnO/WO3 composite NP sensor, which differs from previous reports, in which a ZnO/WO3 composite NP sensor with a molar ratio of 5:5 shows the strongest response to gases. The origin of this difference is explained in detail. The response of the 6:4 ZnO/WO3 composite NP sensor to 200 ppm of CO is ≈30 times stronger than that of the 8:2 ZnO/WO3 composite NP sensor. The 6:4 ZnO/WO3 composite NP sensor also shows the shortest response and recovery time among the five ZnO/WO3 composite NP sensors with different molar ratios. The underlying mechanism for the enhanced response of the ZnO/WO3 composite NP sensors to CO compared with that of the pure ZnO NP sensor is also discussed in detail.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
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.