Synthesis and evaluation of 3D MoO3 nanobelts for selective detection of NO2 gas

Detection of toxic gases using metal oxides has been on anvil for long. Amongst these metal oxides, molybdenum trioxide (MoO 3 ) shows good selectivity, recovery and sensitivity, as explored in this manuscript. Polycrystalline MoO 3 thin films have been deposited using spray pyrolysis technique. The...

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Bibliographic Details
Published in:Journal of materials research 2022-12, Vol.37 (23), p.4284-4295
Main Authors: Sabale, Dhanashri, Harale, Namdev, Srivastava, Rajat, Patil, Pramod S., Sharma, Kiran Kumar K.
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Biomaterials
Chemistry and Materials Science
Electron affinity
Gas sensors
Inorganic Chemistry
Materials Engineering
Materials research
Materials Science
Metal oxides
Molybdenum trioxide
Nanotechnology
Nitrogen dioxide
Selectivity
Sensitivity
Spray pyrolysis
Substrates
Thin films
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Summary:Detection of toxic gases using metal oxides has been on anvil for long. Amongst these metal oxides, molybdenum trioxide (MoO 3 ) shows good selectivity, recovery and sensitivity, as explored in this manuscript. Polycrystalline MoO 3 thin films have been deposited using spray pyrolysis technique. The gas-sensing performance of the MoO 3 thin film is studied as a function of substrate temperature. The structural studies indicate the formation of orthorhombic symmetry, and imaging shows the formation of three-dimensional nanobelts spread over the surface of the MoO 3 thin film, with the width of  ~ 30 nm. The optimized MoO 3 thin-film sensor showed the best gas sensing with sensitivity of 65.14%, selective gas response and good stability of 92% towards NO 2 gas. The results are attributed to high electron affinity of NO 2 molecules, presence of more oxygen vacancies and high surface-to-volume ratio of MoO 3 nanobelts thin films. Graphical abstract
ISSN:0884-2914
2044-5326
DOI:10.1557/s43578-022-00799-5