In:
Journal of Materials Chemistry A, Royal Society of Chemistry (RSC), Vol. 9, No. 38 ( 2021), p. 21824-21834
Kurzfassung:
The modification of simultaneously existing multiple oxidation states in host lattice cations via the introduction of dopants has been reported for NiO- and Co 3 O 4 -based gas-sensing materials. However, SnO 2 , a widely used material for chemiresistive gas sensing has never been reported with simultaneous presence of Sn 2+ and Sn 4+ states, in both the absence and presence of dopants. In this work, we demonstrated how antimony doping in a 3+ state triggers the generation of cationic bivalency in tin oxide-based gas sensors, and it is the quantitative presence of unstable Sn 2+ species that determines the fate of SO 2 -sensing responses by antimony-doped tin oxide gas sensors. While the Sn 2+ content in Sn 0.856 Sb 0.144 O 2 is 1.2 times less than that of Sn 0.957 Sb 0.043 O 2 , the SO 2 sensing response in the former is 1.2 times more than that in the latter. Greater antimony content in Sn 0.856 Sb 0.144 O 2 also leads to the generation of additional trap states that result in sequential return of electrons back into the valence band. The reversibility of Sn 2+ ↔ Sn 4+ during SO 2 adsorption and desorption brings out a new dimension of SnO 2 -based chemiresistors besides those already existing.
Materialart:
Online-Ressource
ISSN:
2050-7488
,
2050-7496
Sprache:
Englisch
Verlag:
Royal Society of Chemistry (RSC)
Publikationsdatum:
2021
ZDB Id:
2702232-8
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