Journal
NANOMATERIALS
Volume 9, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/nano9060900
Keywords
ZnO; nanorods; NiO; p-n junction; H2S gas sensor
Categories
Funding
- National Natural Science Foundation of China [U1630126]
Ask authors/readers for more resources
H2S gas sensors were fabricated using p-n heterojunctions of NiO/ZnO, in which the ZnO nanorod arrays were wrapped with NiO nanosheets via a hydrothermal synthesis method. When the H2S gas molecules were adsorbed and then oxidized on the ZnO surfaces, the free electrons were released. The increase in the electron concentration on the ZnO boosts the transport speed of the electrons on both sides of the NiO/ZnO p-n junction, which significantly improved the sensing performance and selectivity for H2S detection, if compared with sensors using the pure ZnO nanorod arrays. The response to 20 ppm of H2S was 21.3 at 160 degrees C for the heterostructured NiO/ZnO sensor, and the limit of detection was 0.1 ppm. We found that when the sensor was exposed to H2S at an operating temperature below 160 degrees C, the resistance of the sensor significantly decreased, indicating its n-type semiconductor nature, whereas when the operating temperature was above 160 degrees C, the resistance significantly increased, indicating its p-type semiconductor nature. The sensing mechanism of the NiO/ZnO heterostructured H2S gas sensor was discussed in detail.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available