Structure-property relationships in NOx sensor materials composed of arrays of vanadium oxide nanoclusters
| Autor: | M. Ishaque Khan, Hasitha Ganegoda, Carlo U. Segre, Seth B. Darling, Naga Ravikanth Putrevu |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Band gap Coordination number Inorganic chemistry Vanadium chemistry.chemical_element 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Vanadium oxide 0104 chemical sciences Nanoclusters chemistry Oxidation state Physical chemistry General Materials Science Reactivity (chemistry) 0210 nano-technology NOx |
| Zdroj: | Solid State Sciences. 74:1-7 |
| ISSN: | 1293-2558 |
| DOI: | 10.1016/j.solidstatesciences.2017.09.008 |
| Popis: | The mixed-valent vanadium oxide based three-dimensional framework structure species [Cd 3 (H 2 O) 12 V 16 IV V 2 V O 36 (OH) 6 (AO 4 )]·24H 2 O, (A = V,S) ( Cd 3 (VO) o ) represents a rare example of an interesting sensor material which exhibits NO x {NO + NO 2 } semiconducting gas sensor properties under ambient conditions. The electrical resistance of the sensor material Cd 3 (VO) o decreases in air. Combined characterization studies revealed that the building block, {V 18 O 42 (AO 4 )} cluster, of 3-D framework undergoes oxidation and remains intact for at least 2 months. The decrease in resistance is attributable to the reactivity of molecular oxygen towards vanadium which results in an increase in the oxidation state as well as the coordination number of vanadium center and decrease in band gap of Cd 3 (VO) o . Based on these results we propose that the changes in semiconducting properties of Cd 3 (VO) o under ambient conditions are due to the greater overlap between the O 2p and V 3d orbitals occurring during the oxidation. |
| Databáze: | OpenAIRE |
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