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

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149 Scopus citations


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 languageEnglish
Pages (from-to)51-58
Number of pages8
JournalSensors and Actuators, B: Chemical
StatePublished - Nov 2012


  • Gas sensor
  • Molybdenum oxide
  • Nanorods
  • Ultrasonic synthesis


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