Enhanced gas-sensing performance of ZnO@In2O3 core@shell nanofibers prepared by coaxial electrospinning

By Baoyu Huang, Zhenxing Zhang, Changhui Zhao, Limao Cairang, Jinglong Bai, Yaxiong Zhang, X. Mu, Jingwei Du, Huan Wang, Xiaojun Pan and 2 more. 2018

141 citations recorded by the source corpus.

Abstract One-dimensional ZnO@In2O3 core@shell nanofibers (CSNFs) were synthesized via a facile coaxial electrospinning method followed by high-temperature pyrolysis treatment. The obtained nanofibers have a well-defined core@shell structure with ZnO as the core and In2O3 as the shell. Compared with the pure ZnO nanofibers and pure In2O3 nanofibers, the ZnO@In2O3 CSNFs based sensor presents the highest response to ethanol (31.87 at 100 ppm) at an operating temperature of 225 °C, which can be ascribed to the formation of a completely electron depletion layer in In2O3 shell. Moreover, the ZnO@In2O3 CSNFs based sensor also demonstrates outstanding selectivity, excellent stability and low detection limitation (∼5 ppm) to ethanol vapor. The ultraviolet photoelectron spectroscopy confirms a type-II heterojunction formed at the interface of ZnO core and In2O3 shell. The main mechanism for the enhanced performance of ZnO@In2O3 CSNFs gas sensor is the depletion modulating of In2O3 shell layer in electron transfer. These results are valuable for the practical application of ZnO@In2O3 CSNFs in ethanol detection.

Subfields: Bioengineering, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/d5728d06dc33a8a37fd3a7be2d9458e972b4c499