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Improving gas sensing performance by oxygen vacancies in sub-stoichiometric WO3−x
Ist Teil von
RSC advances, 2019-01, Vol.9 (14), p.7723-7728
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2019
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
Sub-stoichiometric WO
3−
x
has provided an alternative platform to investigate oxygen vacancies in gas sensors based on metal-oxides. We present an experimental study on the influence of sub-stoichiometric WO
3−
x
phase upon gas sensing performance. High-quality WO
3−
x
nanostructures with several
x
values (WO
3
, W
19
O
55
, W
5
O
14
, W
18
O
49
) were synthesized and used to fabricate H
2
S gas sensors. Temperature programmed desorption of oxygen (O
2
-TPD) shows that oxygen absorption behaviors of the as-prepared WO
3−
x
nanostructures are affected by oxygen vacancies, which played a critical role in the detection of H
2
S at varying temperature range. We find that oxygen vacancies in sub-stoichiometric WO
3−
x
facilitate the ionosorption process and in turn enhance the performance of the gas sensor.
We present an experimental study on the influence of sub-stoichiometric WO
3−
x
phase upon gas sensing performance. Our work shows that the sub-stoichiometric WO
3−
x
can be used to enhance the low temperature sensing performance.