Journal
SURFACES
Volume 4, Issue 1, Pages 9-16Publisher
MDPI
DOI: 10.3390/surfaces4010002
Keywords
h-MoO3; hydrothermal; microwave; acetone; gas sensing
Funding
- Sao Paulo Research Foundation (FAPESP) [17/26219-0]
- National Council for Scientific and Technological Development (CNPq) [443138/2016-8, 305437/2018-6, PIBIC 139621/2019-9]
- Postdoctoral National Program of the Coordination for the Improvement of Higher Education Personnel (PNPD/CAPES)
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [17/26219-0] Funding Source: FAPESP
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Hexagonal molybdenum trioxide microrods were synthesized using a microwave-assisted hydrothermal method, showing well-faceted morphology and excellent sensing performance for acetone biomarker detection.
Hexagonal molybdenum trioxide (h-MoO3) was synthesized by microwave-assisted hydrothermal method, allowing an ultrafast growth of unidimensional microrods with well-faceted morphology. The crystalline structure of this metastable phase was confirmed by X-ray diffraction (XRD) and Raman spectroscopy. Scanning electron microscopy (SEM) showed that hexagonal microrods can be obtained in one minute with well-defined exposed facets and the fine control of morphology. Sensing tests of the acetone biomarker revealed that the h-MoO3 microrods exhibit, at low ppm level, good sensor signal, fast response/recovery times, selectivity to different interferent gases, and a lower detection limit of 400 ppb.
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