The effect of noble metals on Co gas sensing properties of In2O3 nanoparticles

Jinah Hwang; Hyunsung Jung; Hyo Soon Shin; Dae Sung Kim; Dong Soo Kim; Byeong Kwon Ju; Myoungpyo Chun

doi:10.3390/app11114903

The effect of noble metals on Co gas sensing properties of In₂O₃ nanoparticles

Jinah Hwang, Hyunsung Jung, Hyo Soon Shin, Dae Sung Kim, Dong Soo Kim, Byeong Kwon Ju, Myoungpyo Chun

School of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

Three types of In₂O₃ nanoparticles decorated with Au, Pd and Pt nanoparticles, respectively, were synthesized by thermal decomposition method, and the effects of metal nanoparticles on their phase, microstructure, chemical state, carrier types were investigated with XRD, SEM/TEM, and XPS. Additionally, sensing properties to CO gas, such as sensitivity, etc., were examined with sensing apparatus. Au-decorated In₂O₃ nanoparticles exhibited the highest sensitivity to CO gas, with S = 5.59 at a 10 ppm CO gas concentration at 50 °C compared to Pd or Pt-decorated In₂O₃ nanoparticles. This can be interpreted as a much higher adsorption of oxygen molecules on the In2O3 surface due to the high oxygen vacancies in the In₂O₃ lattice, which generates an electron depletion region in the outer layer of In₂O₃ to sharply increase the resistance or the spill-over effect due to Au nanoparticles on In2O3. Au nanoparticles were observed in the TEM images and confirmed by XPS analysis.

Original language	English
Article number	4903
Journal	Applied Sciences (Switzerland)
Volume	11
Issue number	11
DOIs	https://doi.org/10.3390/app11114903
Publication status	Published - 2021 Jun 1

Keywords

CO gas
Gas sensing
Indium oxide
Nanoparticles

ASJC Scopus subject areas

Materials Science(all)
Instrumentation
Engineering(all)
Process Chemistry and Technology
Computer Science Applications
Fluid Flow and Transfer Processes

Access to Document

10.3390/app11114903

Cite this

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title = "The effect of noble metals on Co gas sensing properties of In2O3 nanoparticles",

abstract = "Three types of In2O3 nanoparticles decorated with Au, Pd and Pt nanoparticles, respectively, were synthesized by thermal decomposition method, and the effects of metal nanoparticles on their phase, microstructure, chemical state, carrier types were investigated with XRD, SEM/TEM, and XPS. Additionally, sensing properties to CO gas, such as sensitivity, etc., were examined with sensing apparatus. Au-decorated In2O3 nanoparticles exhibited the highest sensitivity to CO gas, with S = 5.59 at a 10 ppm CO gas concentration at 50 °C compared to Pd or Pt-decorated In2O3 nanoparticles. This can be interpreted as a much higher adsorption of oxygen molecules on the In2O3 surface due to the high oxygen vacancies in the In2O3 lattice, which generates an electron depletion region in the outer layer of In2O3 to sharply increase the resistance or the spill-over effect due to Au nanoparticles on In2O3. Au nanoparticles were observed in the TEM images and confirmed by XPS analysis.",

keywords = "CO gas, Gas sensing, Indium oxide, Nanoparticles",

author = "Jinah Hwang and Hyunsung Jung and Shin, {Hyo Soon} and Kim, {Dae Sung} and Kim, {Dong Soo} and Ju, {Byeong Kwon} and Myoungpyo Chun",

note = "Funding Information: Funding: This work was supported by the Core Technology (20181110200170, Development of Removal of Acid Gas and Fine Particle for Coal Thermal Power Plant). This work was supported by the Ministry of Trade, Industry & Energy, and supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No.2018R1A6A1A03026005). Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

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AU - Ju, Byeong Kwon

AU - Chun, Myoungpyo

N1 - Funding Information: Funding: This work was supported by the Core Technology (20181110200170, Development of Removal of Acid Gas and Fine Particle for Coal Thermal Power Plant). This work was supported by the Ministry of Trade, Industry & Energy, and supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (No.2018R1A6A1A03026005). Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.

PY - 2021/6/1

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N2 - Three types of In2O3 nanoparticles decorated with Au, Pd and Pt nanoparticles, respectively, were synthesized by thermal decomposition method, and the effects of metal nanoparticles on their phase, microstructure, chemical state, carrier types were investigated with XRD, SEM/TEM, and XPS. Additionally, sensing properties to CO gas, such as sensitivity, etc., were examined with sensing apparatus. Au-decorated In2O3 nanoparticles exhibited the highest sensitivity to CO gas, with S = 5.59 at a 10 ppm CO gas concentration at 50 °C compared to Pd or Pt-decorated In2O3 nanoparticles. This can be interpreted as a much higher adsorption of oxygen molecules on the In2O3 surface due to the high oxygen vacancies in the In2O3 lattice, which generates an electron depletion region in the outer layer of In2O3 to sharply increase the resistance or the spill-over effect due to Au nanoparticles on In2O3. Au nanoparticles were observed in the TEM images and confirmed by XPS analysis.

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