NO2 sensing properties of WO3-decorated In2O3 nanorods and In2O3-decorated WO3 nanorods
Abstract In2O3 nanoparticle (NP)-decorated WO3 nanorods (NRs) were prepared using sol–gel and hydrothermal methods. The In2O3 NRs and WO3 NPs were crystalline. WO3 NP-decorated In2O3 NRs were also prepared using thermal evaporation and hydrothermal methods. The NO2 sensing performance of the In2O3 N...
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Online Access: | https://doi.org/10.1186/s40580-019-0205-2 |
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doaj-84dc282bd6044d2886f2ba74c2a4fe0c2020-12-13T12:15:31ZengSpringerOpenNano Convergence2196-54042019-12-016111010.1186/s40580-019-0205-2NO2 sensing properties of WO3-decorated In2O3 nanorods and In2O3-decorated WO3 nanorodsBumhee Nam0Tae-Kyoung Ko1Soong-Keun Hyun2Chongmu Lee3Department of Materials Science and Engineering, Inha UniversityDepartment of Materials Science and Engineering, Inha UniversityDepartment of Materials Science and Engineering, Inha UniversityDepartment of Materials Science and Engineering, Inha UniversityAbstract In2O3 nanoparticle (NP)-decorated WO3 nanorods (NRs) were prepared using sol–gel and hydrothermal methods. The In2O3 NRs and WO3 NPs were crystalline. WO3 NP-decorated In2O3 NRs were also prepared using thermal evaporation and hydrothermal methods. The NO2 sensing performance of the In2O3 NP-decorated WO3 NR sensor toward NO2 was compared to that of the WO3 NP-decorated In2O3 NR sensor. The former showed a high response to NO2 due to a significant reduction of the conduction channel width upon exposure to NO2. In contrast, the latter showed a far less pronounced response due to limited reduction of the conduction channel width upon exposure to NO2. When the sensors were exposed to a reducing gas instead of an oxidizing gas (NO2), the situation was reversed, i.e., the WO3 NP-decorated In2O3 NR exhibited a stronger response to the reducing gas than the In2O3 NP-decorated WO3 NR sensor. Thus, a semiconducting metal oxide (SMO) with a smaller work function must be used as the decorating material in decorated heterostructured SMO sensors for detection of oxidizing gases. The In2O3 NP-decorated WO3 NR sensor showed higher selectivity for NO2 compared to other gases, including reducing gases and other oxidizing gases, as well as showed high sensitivity to NO2.https://doi.org/10.1186/s40580-019-0205-2Gas sensorHeterostructureWO3In2O3NO2 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Bumhee Nam Tae-Kyoung Ko Soong-Keun Hyun Chongmu Lee |
spellingShingle |
Bumhee Nam Tae-Kyoung Ko Soong-Keun Hyun Chongmu Lee NO2 sensing properties of WO3-decorated In2O3 nanorods and In2O3-decorated WO3 nanorods Nano Convergence Gas sensor Heterostructure WO3 In2O3 NO2 |
author_facet |
Bumhee Nam Tae-Kyoung Ko Soong-Keun Hyun Chongmu Lee |
author_sort |
Bumhee Nam |
title |
NO2 sensing properties of WO3-decorated In2O3 nanorods and In2O3-decorated WO3 nanorods |
title_short |
NO2 sensing properties of WO3-decorated In2O3 nanorods and In2O3-decorated WO3 nanorods |
title_full |
NO2 sensing properties of WO3-decorated In2O3 nanorods and In2O3-decorated WO3 nanorods |
title_fullStr |
NO2 sensing properties of WO3-decorated In2O3 nanorods and In2O3-decorated WO3 nanorods |
title_full_unstemmed |
NO2 sensing properties of WO3-decorated In2O3 nanorods and In2O3-decorated WO3 nanorods |
title_sort |
no2 sensing properties of wo3-decorated in2o3 nanorods and in2o3-decorated wo3 nanorods |
publisher |
SpringerOpen |
series |
Nano Convergence |
issn |
2196-5404 |
publishDate |
2019-12-01 |
description |
Abstract In2O3 nanoparticle (NP)-decorated WO3 nanorods (NRs) were prepared using sol–gel and hydrothermal methods. The In2O3 NRs and WO3 NPs were crystalline. WO3 NP-decorated In2O3 NRs were also prepared using thermal evaporation and hydrothermal methods. The NO2 sensing performance of the In2O3 NP-decorated WO3 NR sensor toward NO2 was compared to that of the WO3 NP-decorated In2O3 NR sensor. The former showed a high response to NO2 due to a significant reduction of the conduction channel width upon exposure to NO2. In contrast, the latter showed a far less pronounced response due to limited reduction of the conduction channel width upon exposure to NO2. When the sensors were exposed to a reducing gas instead of an oxidizing gas (NO2), the situation was reversed, i.e., the WO3 NP-decorated In2O3 NR exhibited a stronger response to the reducing gas than the In2O3 NP-decorated WO3 NR sensor. Thus, a semiconducting metal oxide (SMO) with a smaller work function must be used as the decorating material in decorated heterostructured SMO sensors for detection of oxidizing gases. The In2O3 NP-decorated WO3 NR sensor showed higher selectivity for NO2 compared to other gases, including reducing gases and other oxidizing gases, as well as showed high sensitivity to NO2. |
topic |
Gas sensor Heterostructure WO3 In2O3 NO2 |
url |
https://doi.org/10.1186/s40580-019-0205-2 |
work_keys_str_mv |
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