Effect of synthesis method on the structural, conductive and sensor properties of NiO–In2O3 nanocomposites
https://doi.org/10.17586/2220-8054-2024-15-6-867-878
Abstract
The structural, conductive and sensor properties of NiO–In2O3 composites synthesized by hydrothermal and impregnation methods are investigated and compared. The mixed oxide considered consists of nanoparticles with electronic (In2O3) and hole (NiO) conduction bands. The lattice parameters of indium oxide decrease with the introduction of NiO into composites synthesized by the hydrothermal method. The addition of 3 % NiO to the hydrothermal composite also increases its specific surface area. The specific surface area and In2O3 lattice parameters in the impregnated samples are essentially independent of the NiO content. The conductivity of impregnated composites is an order of magnitude lower than that of hydrothermal composites. An increase in NiO content leads to a significant enhancement of the sensor response to H2 and CO. In addition, there is a decrease in the optimal operating temperature of hydrothermal and impregnated samples by 60 and 20 ◦C, respectively.
Keywords
composite,
hydrothermal method,
impregnation,
indium oxide,
conductivity,
sensor response,
hydrogen,
carbon monoxide
Supporting agencies: The work was supported by the Russian Science Foundation (grant No. 22-19-00037)
About the Authors
M. I. Ikim
N. N. Semenov Federal Research Center for Chemical Physics RAS
Russian Federation
Russian Federation
Mariya I. Ikim
4 Kosygin Street, Moscow, 119991
V. F. Gromov
N. N. Semenov Federal Research Center for Chemical Physics RAS
Russian Federation
Russian Federation
Vladimir F. Gromov
4 Kosygin Street, Moscow, 119991
G. N. Gerasimov
N. N. Semenov Federal Research Center for Chemical Physics RAS
Russian Federation
Russian Federation
Genrikh N. Gerasimov
4 Kosygin Street, Moscow, 119991
V. G. Bekeshev
N. N. Semenov Federal Research Center for Chemical Physics RAS
Russian Federation
Russian Federation
Valentin G. Bekeshev
4 Kosygin Street, Moscow, 119991
L. I. Trakhtenberg
N. N. Semenov Federal Research Center for Chemical Physics RAS; Lomonosov Moscow State University; Moscow Institute of Physics and Technology(State University)
Russian Federation
Russian Federation
Leonid I. Trakhtenberg
4 Kosygin Street, Moscow, 119991
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Review
For citations:
Ikim M.I., Gromov V.F., Gerasimov G.N., Bekeshev V.G., Trakhtenberg L.I. Effect of synthesis method on the structural, conductive and sensor properties of NiO–In2O3 nanocomposites. Nanosystems: Physics, Chemistry, Mathematics. 2024;15(6):867-878. https://doi.org/10.17586/2220-8054-2024-15-6-867-878
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