Journal
RSC ADVANCES
Volume 6, Issue 34, Pages 28419-28427Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra03061k
Keywords
-
Categories
Funding
- Science and Technology on Plasma Physics Laboratory at Research Center of Laser Fusion
- CAEP
- Science and Technology Development Fund of CAEP [2014A0302014]
Ask authors/readers for more resources
In this work, we present gas sensors based on ZnO nanoparticle-loaded electrospun SnO2 nanotube (ZnO/SnO2) n-n heterostructures (HSs) synthesized by electrospinning combined with facile thermal decomposition. The sensing properties of the pristine SnO2 nanotubes (NTs) and ZnO/SnO2 HSs were investigated toward the representative oxidizing (NO2) and reducing (H-2, CO) gases. Results show that the as-prepared ZnO/SnO2 HSs exhibit selectively enhanced and diminished sensing performances for oxidizing and reducing gases, respectively. These phenomena are closely associated with the modulation of the local depletion layer on the surface of SnO2 nanoparticles (NPs) caused by charge transfer at the heterojunctions due to work function difference. A modified grain boundary-controlled sensing mechanism is proposed to describe charge transport in sensing layers based on the contact potential barriers between nanoparticles. Our study indicates that the selection of material system and their synergism are keys to the effective design of gas sensors with semiconducting metal oxide HSs.
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