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NO2 Gas Sensing Properties of Multiple Networked ZnGa2O4 Nanorods Coated with TiO2

Authors :
Changhyun Jin
Sunghoon Park
Hyunsung Ko
Chongmu Lee
Soyeon An
Source :
Journal of Nanoscience and Nanotechnology. 15:433-438
Publication Year :
2015
Publisher :
American Scientific Publishers, 2015.

Abstract

The NO2 gas sensing properties of ZnGa2O4-TiO2 heterostructure nanorods was examined. ZnGa2O4-core/TiO2-shell nanorods were fabricated by the thermal evaporation of a mixture of Zn and GaN powders and the sputter deposition of TiO2. Multiple networked ZnGa2O4-core/TiO2-shell nanorod sensors showed the response of 876% at 10 ppm NO2 at 300 degrees C. This response value at 10 ppm NO2 is approximately 4 times larger than that of bare ZnGa2O4 nanorod sensors. The response values obtained by the ZnGa2O4-core/TiO2-shell nanorods in this study are more than 13 times higher than those obtained previously by the SnO2-core/ZnO-shell nanofibers at 5% NO2. The significant enhancement in the response of ZnGa2O4 nanorods to NO2 gas by coating them with TiO2 can be explained based on the space-charge model.

Details

ISSN :
15334899 and 15334880
Volume :
15
Database :
OpenAIRE
Journal :
Journal of Nanoscience and Nanotechnology
Accession number :
edsair.doi...........cb44eb84d062139268adf8e3e91fdff0