Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 292, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2022.126868
Keywords
Nitrogen dioxide; Gas sensor; SnO2; BiVO4; DFT
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Funding
- Ministry of Science and Technology [MOST 111-2113-M-126-003]
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This study successfully synthesized tin oxide-bismuth vanadate heterostructures using a simple hydrothermal synthesis method and demonstrated their potential for real-time detection of NO2 traces at room temperature.
Tin oxide-bismuth vanadate heterostructures (SnO2-BiVO4) exhibit considerably enhanced surface-exposed edge sites with an abundance of the dangling bond due to their intrinsic crystallographic anisotropy. Its high chemical reactivity and chemisorption capabilities make it ideal for high-performance electrochemical sensing. In this paper, Tin oxide-bismuth vanadate heterostructures (SnO2-BiVO4) were synthesized using a simple hydrothermal synthesis method and employed as room temperature NO2 sensor. X-ray diffractometers (XRD), scanning electron microscopes (SEM), and transmission electron microscopes. (TEM), X-ray photoelectron spectrometer (XPS) and ultraviolet-visible spectrometer (UV-vis) were used to examine the heterogeneous structure of as-synthesized SnO2-BiVO4. The as-prepared SnO2-BiVO4 (1:1) revealed optimal gas-sensing performance toward 0.1 ppm-1 ppm NO2 at a relatively low optimal operating temperature (298 K), including fast response, fast recovery, high sensitivity and good reproducibility. The experimental results demonstrated that the as-synthesized SnO2-BiVO4 has enormous future potential for real-time detection of NO2 traces at room temperature. Density Functional Theory (DFT) calculations were analyzed to reveal the underlying principles behind the experimentally observed improvement.
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