Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 8, Issue 15, Pages 7214-7228Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0ta00511h
Keywords
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Funding
- Ministry of Science and Higher Education of the Russian Federation [FZSR-2020-0007, 075-03-2020-097/1]
- Russ. Ministry of Education and Science [16.1119.2017/4.6]
- DAAD scholarships [91736103, 91619230]
- Russian Science Foundation [19-72-00136]
- RFBR [19-32-90160]
- Russian Science Foundation [19-72-00136] Funding Source: Russian Science Foundation
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Here, we study quasi-two-dimensional crystals of Co3O4 grown by electrochemical synthesis on Pt electrodes with a nanoflake morphology to serve as a gas sensor. When synthesizing in aqueous electrolytes under applied electrical bias, the material follows a self-hierarchical architecture to primarily appear as the hexagonal nanoflakes alpha-Co(OH)(2). After heating up to 300 degrees C in air, the as-synthesized material transforms to Co3O4, preserving the original hierarchical morphology. The Co3O4 nanoflakes have been found to have remarkable chemiresistive response when exposed to various kinds of alcohol vapors, at low ppm concentrations in a mixture with air, over a wide range of temperatures up to 300 degrees C with a detection limit down to the ppb range with direct dependence on the molecule weight of the alcohol. We explain the observed features of the gas response of the Co3O4 nanoflakes by a shift in the electron density under the chemisorption of VOCs, verified by DFT calculations.
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