The Effect of Noble Metals on Co Gas Sensing Properties of In<sub>2</sub>O<sub>3</sub> Nanoparticles

The Effect of Noble Metals on Co Gas Sensing Properties of In<sub>2</sub>O<sub>3</sub> Nanoparticles

Three types of In<sub>2</sub>O<sub>3</sub> 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 inves...

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Main Authors: JinAh Hwang, Hyunsung Jung, Hyo-Soon Shin, Dae-Sung Kim, Dong Soo Kim, Byeong-Kwon Ju, MyoungPyo Chun
Format: Article
Language:English
Published: MDPI AG 2021-05-01
Series:Applied Sciences
Subjects:
CO gas
indium oxide
gas sensing
nanoparticles
Online Access:https://www.mdpi.com/2076-3417/11/11/4903
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spelling doaj-1411ec23eea843ec92171d66af203a7a2021-06-01T01:13:37ZengMDPI AGApplied Sciences2076-34172021-05-01114903490310.3390/app11114903The Effect of Noble Metals on Co Gas Sensing Properties of In<sub>2</sub>O<sub>3</sub> NanoparticlesJinAh Hwang0Hyunsung Jung1Hyo-Soon Shin2Dae-Sung Kim3Dong Soo Kim4Byeong-Kwon Ju5MyoungPyo Chun6Electronic Convergence Materials Division, Korea Institute of Ceramic Engineering and Technology, Jinju-si 660-031, KoreaElectronic Convergence Materials Division, Korea Institute of Ceramic Engineering and Technology, Jinju-si 660-031, KoreaElectronic Convergence Materials Division, Korea Institute of Ceramic Engineering and Technology, Jinju-si 660-031, KoreaElectronic Convergence Materials Division, Korea Institute of Ceramic Engineering and Technology, Jinju-si 660-031, KoreaPEMS Research Institute, Department of Creative Convergence Engineering, Hanbat National University, Daejeon 305-719, KoreaDisplay and Nanosystem Laboratory, School of Electrical Engineering, Korea University, Seoul 13701, KoreaElectronic Convergence Materials Division, Korea Institute of Ceramic Engineering and Technology, Jinju-si 660-031, KoreaThree types of In<sub>2</sub>O<sub>3</sub> 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 In<sub>2</sub>O<sub>3</sub> 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 In<sub>2</sub>O<sub>3</sub> nanoparticles. This can be interpreted as a much higher adsorption of oxygen molecules on the In<sub>2</sub>O<sub>3</sub> surface due to the high oxygen vacancies in the In<sub>2</sub>O<sub>3</sub> lattice, which generates an electron depletion region in the outer layer of In<sub>2</sub>O<sub>3</sub> to sharply increase the resistance or the spill-over effect due to Au nanoparticles on In<sub>2</sub>O<sub>3</sub>. Au nanoparticles were observed in the TEM images and confirmed by XPS analysis.https://www.mdpi.com/2076-3417/11/11/4903CO gasindium oxidegas sensingnanoparticles
collection DOAJ
language English
format Article
sources DOAJ
author JinAh Hwang
Hyunsung Jung
Hyo-Soon Shin
Dae-Sung Kim
Dong Soo Kim
Byeong-Kwon Ju
MyoungPyo Chun
spellingShingle JinAh Hwang
Hyunsung Jung
Hyo-Soon Shin
Dae-Sung Kim
Dong Soo Kim
Byeong-Kwon Ju
MyoungPyo Chun
The Effect of Noble Metals on Co Gas Sensing Properties of In<sub>2</sub>O<sub>3</sub> Nanoparticles
Applied Sciences
CO gas
indium oxide
gas sensing
nanoparticles
author_facet JinAh Hwang
Hyunsung Jung
Hyo-Soon Shin
Dae-Sung Kim
Dong Soo Kim
Byeong-Kwon Ju
MyoungPyo Chun
author_sort JinAh Hwang
title The Effect of Noble Metals on Co Gas Sensing Properties of In<sub>2</sub>O<sub>3</sub> Nanoparticles
title_short The Effect of Noble Metals on Co Gas Sensing Properties of In<sub>2</sub>O<sub>3</sub> Nanoparticles
title_full The Effect of Noble Metals on Co Gas Sensing Properties of In<sub>2</sub>O<sub>3</sub> Nanoparticles
title_fullStr The Effect of Noble Metals on Co Gas Sensing Properties of In<sub>2</sub>O<sub>3</sub> Nanoparticles
title_full_unstemmed The Effect of Noble Metals on Co Gas Sensing Properties of In<sub>2</sub>O<sub>3</sub> Nanoparticles
title_sort effect of noble metals on co gas sensing properties of in<sub>2</sub>o<sub>3</sub> nanoparticles
publisher MDPI AG
series Applied Sciences
issn 2076-3417
publishDate 2021-05-01
description Three types of In<sub>2</sub>O<sub>3</sub> 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 In<sub>2</sub>O<sub>3</sub> 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 In<sub>2</sub>O<sub>3</sub> nanoparticles. This can be interpreted as a much higher adsorption of oxygen molecules on the In<sub>2</sub>O<sub>3</sub> surface due to the high oxygen vacancies in the In<sub>2</sub>O<sub>3</sub> lattice, which generates an electron depletion region in the outer layer of In<sub>2</sub>O<sub>3</sub> to sharply increase the resistance or the spill-over effect due to Au nanoparticles on In<sub>2</sub>O<sub>3</sub>. Au nanoparticles were observed in the TEM images and confirmed by XPS analysis.
topic CO gas
indium oxide
gas sensing
nanoparticles
url https://www.mdpi.com/2076-3417/11/11/4903
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