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Fabrication of a Micro-Electromechanical System-Based Acetone Gas Sensor Using CeO2 Nanodot-Decorated WO3 Nanowires
journal contribution
posted on 2020-03-11, 13:37 authored by Kaiping Yuan, Cheng-Yu Wang, Li-Yuan Zhu, Qi Cao, Jia-He Yang, Xiao-Xi Li, Wei Huang, Yuan-Yuan Wang, Hong-Liang Lu, David Wei ZhangPreparation
of reliable, stable, and highly responsive gas-sensing devices for
the detection of acetone has been considered to be a key issue for
the development of accurate disease diagnosis systems via exhaled
breath. In this paper, novel CeO2 nanodot-decorated WO3 nanowires are successfully synthesized through a sequential
hydrothermal and thermolysis process. Such CeO2 nanodot-decorated
WO3 nanowires exhibited a remarkable enhancement in acetone-sensing
performance based on a miniaturized micro-electromechanical system
device, which affords high response (S = 1.30–500
ppb, 1.62–2.5 ppm), low detection limit (500 ppb), and superior
selectivity toward acetone. The improved performance of the acetone
sensor is likely to be originated from the fast carrier transportation
of WO3 nanowires, the formation of WO3–CeO2 heterojunctions, and the existence of large amounts of oxygen
vacancies in CeO2. The improved reaction thermodynamics
and sensing mechanisms have also been revealed by the specific band
alignment and X-ray photoelectron spectroscopy analysis.
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Such CeO 2 nanodot-decorated WO 3 nanowiresreaction thermodynamicscarrier transportationWO 3 nanowiresmicro-electromechanical system devicedisease diagnosis systemsgas-sensing devicesdetectionCeO 2 Nanodot-Decorated WO 3 Nanowires Preparationnovel CeO 2 nanodot-decorated WO 3 nanowiresppboxygen vacanciesthermolysis processCeO 2acetone sensorsequential hydrothermalMicro-Electromechanical System-Based Acetone Gas Sensorband alignmentacetone-sensing performanceX-ray photoelectron spectroscopy analysis
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