A Russian-Belarusian research group has developed a new tungsten oxide-based gas detection material with strong sensitivity to carbon monoxide, nitrogen dioxide and acetone. The new material has a gas detection sensitivity 9 times higher than the current ones. The study was published in the journal Nano-Structures & Nano-Objects.
Image credit: National University of Science and Technology (MISiS)
The regulation of indoor air quality and the identification of harmful gases and volatile organic compounds are critical tasks to increase the quality of life and working circumstances, and are in high demand in a number of manufacturing, agricultural and agricultural applications. environmental. This requires the creation of specific gas detection materials with a high detection response to a wide range of gases of various chemical compositions.
Researchers from the National University of Science and Technology (MISiS), the State University of Belarus and the National Academy of Sciences of Belarus of the AV Luikov Institute of Heat and Mass Transfer have developed a new nanocomposite material with high sensitivity to a series of harmful gases in a wide range of concentrations. It was made with graphene and nanopoles of tungsten oxide modified with copper nanocomposites.
The sol-gel process, also called chemical solution deposition, was used to create tungsten oxide. Graphene and copper nanopoles were then added to the precursor gel using the solution combustion approach to create a densely interconnected defective structure.
The gas detection properties of the material with carbon monoxide, nitrogen dioxide and acetone used as test gases were then studied. Tests have shown that the introduction of 1% by weight of modifier leads to a 9-fold increase in the sensitivity of the material to carbon dioxide and a 6-fold increase in its sensitivity to acetone. The highest detection response to acetone was obtained for samples with 2% by weight of the modifier. “
Dmitry Moskovskih, Head of the Ceramic Nanomaterials Engineering Research Center, National University of Science and Technology (MISiS)
Because of the ease of the suggested synthesis process, scientists claim that the nanocomposites produced have enormous potential as an effective application in commercial sensors of extremely sensitive gases.
Magazine reference:
Haiduk, Y., et al. (2022) WO3 – graphene – Cu nanocomposites for CO, NO2 and acetone gas sensors. Nano-structures and nano-objects. doi.org/10.1016/j.nanoso.2021.100824.
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