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Title: Structure-property relationships in NOx sensor materials composed of arrays of vanadium oxide nanoclusters

Journal Article · · Solid State Sciences
ORCiD logo [1];  [2]; ORCiD logo [1];  [1];  [1]
  1. Illinois Inst. of Technology, Chicago, IL (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, Chicago, IL (United States)
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Here, the mixed-valent vanadium oxide based three-dimensional framework structure species [Cd3(H2O)12V16IVV2VO36(OH)6(AO4)]∙24H2O, (A=V,S) (Cd3(VO)o) represents a rare example of an interesting sensor material which exhibits NOx {NO+NO2} semiconducting gas sensor properties under ambient conditions. The electrical resistance of the sensor material Cd3(VO)o decreases in air. Combined characterization studies revealed that the building block, {V18O42(AO4)} 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 Cd3(VO)o. Based on these results we propose that the changes in semiconducting properties of Cd3(VO)o under ambient conditions are due to the greater overlap between the O 2p and V 3d orbitals occurring during the oxidation.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1429402
Alternate ID(s):
OSTI ID: 1549490
Journal Information:
Solid State Sciences, Vol. 74, Issue C; ISSN 1293-2558
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

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Related Subjects

36 MATERIALS SCIENCE
vanadium oxide nanoclusters
NOx sensing
oxidation
XAFS