Ultrasonic synthesis of MoO 3 nanorods and their gas sensing properties

Shouli Bai; Song Chen; Liangyuan Chen; Kewei Zhang; Ruixian Luo; Dianqing Li; Chung Chiun Liu

doi:10.1016/j.snb.2012.08.015

Ultrasonic synthesis of MoO ₃ nanorods and their gas sensing properties

Shouli Bai, Song Chen, Liangyuan Chen, Kewei Zhang, Ruixian Luo, Dianqing Li, Chung Chiun Liu

Graduate Institute of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

192 Scopus citations

Abstract

Molybdenum oxide nanorods have been successfully synthesized by a simple probe ultrasonic approach. A possible growth mechanism of the MoO ₃ nanorods and the influence of ultrasonic times on morphologies have been investigated. The characterization results of field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and differential thermal analysis (DTA) demonstrate that the nanorods exhibits hexagonal molybdenum oxide (h-MoO ₃) and an irreversible phase transition occurs to form orthorhombic α-MoO ₃ after annealing at 436 °C. The gas sensing tests indicate that the MoO ₃ based sensor has high response to NO ₂ and the response is not interfered by CO and CH ₄ at operating temperature of 290 °C. The intrinsic sensing performance arises from the non-stoichiometry of MoO ₃ due to the presence of Mo ⁵⁺ ions in the lattice of oxide, which has been confirmed by the results of X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) analysis.

Original language	English
Pages (from-to)	51-58
Number of pages	8
Journal	Sensors and Actuators, B: Chemical
Volume	174
DOIs	https://doi.org/10.1016/j.snb.2012.08.015
State	Published - Nov 2012

Keywords

Gas sensor
Molybdenum oxide
Nanorods
Ultrasonic synthesis

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10.1016/j.snb.2012.08.015

Cite this

@article{da584474da1b40fa95dbd261efed0e8e,

title = "Ultrasonic synthesis of MoO 3 nanorods and their gas sensing properties",

abstract = "Molybdenum oxide nanorods have been successfully synthesized by a simple probe ultrasonic approach. A possible growth mechanism of the MoO 3 nanorods and the influence of ultrasonic times on morphologies have been investigated. The characterization results of field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and differential thermal analysis (DTA) demonstrate that the nanorods exhibits hexagonal molybdenum oxide (h-MoO 3) and an irreversible phase transition occurs to form orthorhombic α-MoO 3 after annealing at 436 °C. The gas sensing tests indicate that the MoO 3 based sensor has high response to NO 2 and the response is not interfered by CO and CH 4 at operating temperature of 290 °C. The intrinsic sensing performance arises from the non-stoichiometry of MoO 3 due to the presence of Mo 5+ ions in the lattice of oxide, which has been confirmed by the results of X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) analysis.",

keywords = "Gas sensor, Molybdenum oxide, Nanorods, Ultrasonic synthesis",

author = "Shouli Bai and Song Chen and Liangyuan Chen and Kewei Zhang and Ruixian Luo and Dianqing Li and Liu, {Chung Chiun}",

note = "Funding Information: This work was supported by the National Natural Science Foundation of China (Grant Nos. 51072014 and 21177007 ) and Beijing Natural Science Foundation (Grant Nos. 8102028 and 811202 2). ",

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T1 - Ultrasonic synthesis of MoO 3 nanorods and their gas sensing properties

AU - Bai, Shouli

AU - Chen, Song

AU - Chen, Liangyuan

AU - Zhang, Kewei

AU - Luo, Ruixian

AU - Li, Dianqing

AU - Liu, Chung Chiun

N1 - Funding Information: This work was supported by the National Natural Science Foundation of China (Grant Nos. 51072014 and 21177007 ) and Beijing Natural Science Foundation (Grant Nos. 8102028 and 811202 2).

PY - 2012/11

Y1 - 2012/11

N2 - Molybdenum oxide nanorods have been successfully synthesized by a simple probe ultrasonic approach. A possible growth mechanism of the MoO 3 nanorods and the influence of ultrasonic times on morphologies have been investigated. The characterization results of field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and differential thermal analysis (DTA) demonstrate that the nanorods exhibits hexagonal molybdenum oxide (h-MoO 3) and an irreversible phase transition occurs to form orthorhombic α-MoO 3 after annealing at 436 °C. The gas sensing tests indicate that the MoO 3 based sensor has high response to NO 2 and the response is not interfered by CO and CH 4 at operating temperature of 290 °C. The intrinsic sensing performance arises from the non-stoichiometry of MoO 3 due to the presence of Mo 5+ ions in the lattice of oxide, which has been confirmed by the results of X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) analysis.

AB - Molybdenum oxide nanorods have been successfully synthesized by a simple probe ultrasonic approach. A possible growth mechanism of the MoO 3 nanorods and the influence of ultrasonic times on morphologies have been investigated. The characterization results of field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and differential thermal analysis (DTA) demonstrate that the nanorods exhibits hexagonal molybdenum oxide (h-MoO 3) and an irreversible phase transition occurs to form orthorhombic α-MoO 3 after annealing at 436 °C. The gas sensing tests indicate that the MoO 3 based sensor has high response to NO 2 and the response is not interfered by CO and CH 4 at operating temperature of 290 °C. The intrinsic sensing performance arises from the non-stoichiometry of MoO 3 due to the presence of Mo 5+ ions in the lattice of oxide, which has been confirmed by the results of X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) analysis.

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KW - Molybdenum oxide

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KW - Ultrasonic synthesis

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