Near Room Temperature, Fast-Response, and Highly Sensitive Triethylamine Sensor Assembled with Au-Loaded ZnO/SnO₂ Core-Shell Nanorods on Flat Alumina Substrates.
Chemiresistive gas sensors with low power consumption, fast response, and reliable fabrication process for a specific target gas have been now created for many applications. They require both sensitive nanomaterials and an efficient substrate chip for heating and electrical addressing. Herein, a near room working temperature and fast response triethylamine (TEA) gas sensor has been fabricated successfully by designing gold (Au)-loaded ZnO/SnO2 core-shell nanorods. ZnO nanorods grew directly on Al2O3 flat electrodes with a cost-effective hydrothermal process. By employing pulsed laser deposition (PLD) and DC-sputtering methods, the construction of Au nanoparticle-loaded ZnO/SnO2 core/shell nanorod heterostructure is highly controllable and reproducible. In comparison with pristine ZnO, SnO2, and Au-loaded ZnO, SnO2 sensors, Au-ZnO/SnO2 nanorod sensors exhibit a remarkably high and fast response to TEA gas at working temperatures as low as 40 °C. The enhanced sensing property of the Au-ZnO/SnO2 sensor is also discussed with the semiconductor depletion layer model introduced by Au-SnO2 Schottky contact and ZnO/SnO2 N-N heterojunction.
Laboratory of Inorganic Functional Materials, School of Materials Science and Engineering, University of Jinan , Jinan 250022, Shandong, China.
Dian-Xing
DX
Ju
Laboratory of Inorganic Functional Materials, School of Materials Science and Engineering, University of Jinan , Jinan 250022, Shandong, China.
Hong-Yan
HY
Xu
Laboratory of Inorganic Functional Materials, School of Materials Science and Engineering, University of Jinan , Jinan 250022, Shandong, China.
Zhi-Wen
ZW
Qiu
Laboratory of Inorganic Functional Materials, School of Materials Science and Engineering, University of Jinan , Jinan 250022, Shandong, China.
Zi-Chao
ZC
Zhang
Laboratory of Inorganic Functional Materials, School of Materials Science and Engineering, University of Jinan , Jinan 250022, Shandong, China.
Qi
Q
Xu
Laboratory of Inorganic Functional Materials, School of Materials Science and Engineering, University of Jinan , Jinan 250022, Shandong, China.
Jun
J
Zhang
Laboratory of Inorganic Functional Materials, School of Materials Science and Engineering, University of Jinan , Jinan 250022, Shandong, China.
Jie-Qiang
JQ
Wang
Laboratory of Inorganic Functional Materials, School of Materials Science and Engineering, University of Jinan , Jinan 250022, Shandong, China.
Bing-Qiang
BQ
Cao
Au-SnO2/ZnO nanorod; N−N heterojunction; Schottky contact; TEA sensor; near room-temperature