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Near Room Temperature, Fast-Response, and Highly Sensitive Triethylamine Sensor Assembled with Au-Loaded ZnO/SnO2 Core–Shell Nanorods on Flat Alumina Substrates
journal contribution
posted on 2015-09-02, 00:00 authored by Dian-Xing Ju, Hong-Yan Xu, Zhi-Wen Qiu, Zi-Chao Zhang, Qi Xu, Jun Zhang, Jie-Qiang Wang, Bing-Qiang CaoChemiresistive 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.
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substrate chipgas sensorSnO 2 sensorsresponse triethylaminepower consumptionAl 2Olaser depositionfabrication processPLDTEA gassemiconductor depletion layer modeltarget gasZnO nanorodsFlat Alumina SubstratesChemiresistive gas sensorshydrothermal processSensitive Triethylamine Sensor AssembledRoom Temperature
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