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Regulation of N-type In2O3 Content on the Conductivity Type of Co3O4 Based Acetone Sensor

Materials Science-Poland
Volume 41 (2023): Issue 1 (March 2023)
By:
Open Access
|Sep 2023

Figures & Tables

Fig. 1.

A schematic diagram of the whole experimental process
A schematic diagram of the whole experimental process

Fig. 2.

XRD patterns of In2O3, In2O3/Co3O4-4, In2O3/Co3O4-3, In2O3/Co3O4-2, In2O3/Co3O4-1 and Co3O4 NFs
XRD patterns of In2O3, In2O3/Co3O4-4, In2O3/Co3O4-3, In2O3/Co3O4-2, In2O3/Co3O4-1 and Co3O4 NFs

Fig. 3.

SEM images of In2O3 NFs, Co3O4 NFs, In2O3/Co3O4-1, In2O3/Co3O4-2, In2O3/Co3O4-3 and In2O3/Co3O4-4 :(a-f) before calcination, and (g-l) after calcination
SEM images of In2O3 NFs, Co3O4 NFs, In2O3/Co3O4-1, In2O3/Co3O4-2, In2O3/Co3O4-3 and In2O3/Co3O4-4 :(a-f) before calcination, and (g-l) after calcination

Fig. 4.

TEM images of (a-b) In2O3/Co3O4-3 nanofibers and (c) HRTEM of In2O3/Co3O4-3
TEM images of (a-b) In2O3/Co3O4-3 nanofibers and (c) HRTEM of In2O3/Co3O4-3

Fig. 5.

The elemental composition chart of (a) In2O3/Co3O4 NFs, (b) Au element, (c) Co element, (d) In element, (e) O element, and (f) EDS of In2O3/Co3O4-3
The elemental composition chart of (a) In2O3/Co3O4 NFs, (b) Au element, (c) Co element, (d) In element, (e) O element, and (f) EDS of In2O3/Co3O4-3

Fig. 6.

The schematic diagram of the calcination process model
The schematic diagram of the calcination process model

Fig. 7.

Response of Co3O4, In2O3, In2O3/Co3O4-1, In2O3/Co3O4-2, In2O3/Co3O4-3 and In2O3/Co3O4-4 sensors to 40 ppm acetone at different operating temperatures
Response of Co3O4, In2O3, In2O3/Co3O4-1, In2O3/Co3O4-2, In2O3/Co3O4-3 and In2O3/Co3O4-4 sensors to 40 ppm acetone at different operating temperatures

Fig. 8.

Transient curves of the gas sensors based on the Co3O4, In2O3, In2O3/Co3O4-1, In2O3/Co3O4-2, In2O3/Co3O4-3, and In2G3/Co3G4-4 to different acetone concentrations at 200°C
Transient curves of the gas sensors based on the Co3O4, In2O3, In2O3/Co3O4-1, In2O3/Co3O4-2, In2O3/Co3O4-3, and In2G3/Co3G4-4 to different acetone concentrations at 200°C

Fig. 9.

Selectivity of Co3O4, In2O3, In2O3/Co3O4-1, In2O3/Co3O4-2, In2O3/Co3O4-3, and In2O3/Co3O4-4 sensors
Selectivity of Co3O4, In2O3, In2O3/Co3O4-1, In2O3/Co3O4-2, In2O3/Co3O4-3, and In2O3/Co3O4-4 sensors

Fig. 10.

(a) Response and recovery curve of In2O3/Co3O4-3 to 0.7 ppm acetone at 200°C; (b) Long term stability of In2O3/Co3O4-3 toward 10 ppm acetone over a period of 5 months at an operating temperature of 200°C
(a) Response and recovery curve of In2O3/Co3O4-3 to 0.7 ppm acetone at 200°C; (b) Long term stability of In2O3/Co3O4-3 toward 10 ppm acetone over a period of 5 months at an operating temperature of 200°C

Fig. 11.

Sensing mechanism of In2O3/Co3O4 (a) in air and (b) in VOCs, and (c) energy band diagram of Co3O4/Co3O4, Co3O4/In2O3 and In2O3/In2O3 grains
Sensing mechanism of In2O3/Co3O4 (a) in air and (b) in VOCs, and (c) energy band diagram of Co3O4/Co3O4, Co3O4/In2O3 and In2O3/In2O3 grains

Comparative analysis of sensor performance and preparation processes based on In2O3 sensing materials

Sensor materialsFabrication methodOperating temperature (°C)Response/ppmReferences
SnO2/In2O3Thermal evaporation3001.05/100[29]
In2O3 microsphereSolvothermal method25036/20[30]
In2O3facile solution route2608.60/100[31]
Bi2O3/ In2O3one-step process20017.7/200[32]
Co3O4electrospinning2001.71/40This work
In2O3electrospinning2007/40This work
In2O3/Co3O4-3Double-jet electrospinning2009.5/40This work
DOI: https://doi.org/10.2478/msp-2023-0014 | Journal eISSN: 2083-134X | Journal ISSN: 2083-1331
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Language: English
Page range: 202 - 213
Submitted on: Jan 19, 2023
Accepted on: Jun 15, 2023
Published on: Sep 19, 2023
Published by: Sciendo
In partnership with: Paradigm Publishing Services
Publication frequency: 4 times per year
Keywords:
electrospinning,
InO/CoO,
gas sensor,
nanofibers,
p-n transition
Related subjects:
Materials sciences,
Materials sciences, other,
Nanomaterials,
Functional and smart materials,
Materials characterization and properties

© 2023 Lijuan Fu, Shuxing Fan, Zhao Wang, Wei Tang, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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