Highly selective sub–10 ppm H2S gas sensors based on Ag-doped CaCu3Ti4O12 films
The detection of the toxic H2S gas is of great practical, environmental and industrial interest. This work presents sensing devices fabricated with Ag-doped CaCu3Ti4O12 (CCTO) thin films using a cost effective sol-gel deposition method. When compared with undoped CCTO sensors, very low doping levels...
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_09254005_v260_n_p571_Natkaeo |
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todo:paper_09254005_v260_n_p571_Natkaeo2023-10-03T15:46:16Z Highly selective sub–10 ppm H2S gas sensors based on Ag-doped CaCu3Ti4O12 films Natkaeo, A. Phokharatkul, D. Hodak, J.H. Wisitsoraat, A. Hodak, S.K. Ag-doped CaCu3Ti4O12 H2S sensor Calcium compounds Catalytic oxidation Chemical sensors Cost effectiveness Deposition Gas detectors Semiconductor doping Silver Sol-gels Thin films Titanium compounds CaCu3Ti4O12 Concentration ranges Electrical resistances Operating temperature Orders of magnitude Sensing devices Sol-gel deposition Temperature range Copper compounds The detection of the toxic H2S gas is of great practical, environmental and industrial interest. This work presents sensing devices fabricated with Ag-doped CaCu3Ti4O12 (CCTO) thin films using a cost effective sol-gel deposition method. When compared with undoped CCTO sensors, very low doping levels of Ag cause a dramatic improvement of the response towards H2S gas. The Ag-doped CCTO films were found to be remarkable sensors towards H2S in the concentration range of 0.2–10 ppm. In addition, the response of these sensors towards NH3, H2, NO2 and ethanol vapor was up to two orders of magnitude lower than that for H2S, yielding a highly selective mean of detecting and quantifying H2S. Gas sensing experiments were conducted at operating temperatures ranging from 150 to 350 °C with an optimum response found at 250 °C. In the studied temperature range, Ag-doped CCTO film sensors also showed much shorter response times than that of undoped one. It is found that Ag plays a role promoting the adsorption and catalytic oxidation of H2S leading to drastic changes in the electrical resistance via electron injection into CCTO. © 2017 JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09254005_v260_n_p571_Natkaeo |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Ag-doped CaCu3Ti4O12 H2S sensor Calcium compounds Catalytic oxidation Chemical sensors Cost effectiveness Deposition Gas detectors Semiconductor doping Silver Sol-gels Thin films Titanium compounds CaCu3Ti4O12 Concentration ranges Electrical resistances Operating temperature Orders of magnitude Sensing devices Sol-gel deposition Temperature range Copper compounds |
| spellingShingle |
Ag-doped CaCu3Ti4O12 H2S sensor Calcium compounds Catalytic oxidation Chemical sensors Cost effectiveness Deposition Gas detectors Semiconductor doping Silver Sol-gels Thin films Titanium compounds CaCu3Ti4O12 Concentration ranges Electrical resistances Operating temperature Orders of magnitude Sensing devices Sol-gel deposition Temperature range Copper compounds Natkaeo, A. Phokharatkul, D. Hodak, J.H. Wisitsoraat, A. Hodak, S.K. Highly selective sub–10 ppm H2S gas sensors based on Ag-doped CaCu3Ti4O12 films |
| topic_facet |
Ag-doped CaCu3Ti4O12 H2S sensor Calcium compounds Catalytic oxidation Chemical sensors Cost effectiveness Deposition Gas detectors Semiconductor doping Silver Sol-gels Thin films Titanium compounds CaCu3Ti4O12 Concentration ranges Electrical resistances Operating temperature Orders of magnitude Sensing devices Sol-gel deposition Temperature range Copper compounds |
| description |
The detection of the toxic H2S gas is of great practical, environmental and industrial interest. This work presents sensing devices fabricated with Ag-doped CaCu3Ti4O12 (CCTO) thin films using a cost effective sol-gel deposition method. When compared with undoped CCTO sensors, very low doping levels of Ag cause a dramatic improvement of the response towards H2S gas. The Ag-doped CCTO films were found to be remarkable sensors towards H2S in the concentration range of 0.2–10 ppm. In addition, the response of these sensors towards NH3, H2, NO2 and ethanol vapor was up to two orders of magnitude lower than that for H2S, yielding a highly selective mean of detecting and quantifying H2S. Gas sensing experiments were conducted at operating temperatures ranging from 150 to 350 °C with an optimum response found at 250 °C. In the studied temperature range, Ag-doped CCTO film sensors also showed much shorter response times than that of undoped one. It is found that Ag plays a role promoting the adsorption and catalytic oxidation of H2S leading to drastic changes in the electrical resistance via electron injection into CCTO. © 2017 |
| format |
JOUR |
| author |
Natkaeo, A. Phokharatkul, D. Hodak, J.H. Wisitsoraat, A. Hodak, S.K. |
| author_facet |
Natkaeo, A. Phokharatkul, D. Hodak, J.H. Wisitsoraat, A. Hodak, S.K. |
| author_sort |
Natkaeo, A. |
| title |
Highly selective sub–10 ppm H2S gas sensors based on Ag-doped CaCu3Ti4O12 films |
| title_short |
Highly selective sub–10 ppm H2S gas sensors based on Ag-doped CaCu3Ti4O12 films |
| title_full |
Highly selective sub–10 ppm H2S gas sensors based on Ag-doped CaCu3Ti4O12 films |
| title_fullStr |
Highly selective sub–10 ppm H2S gas sensors based on Ag-doped CaCu3Ti4O12 films |
| title_full_unstemmed |
Highly selective sub–10 ppm H2S gas sensors based on Ag-doped CaCu3Ti4O12 films |
| title_sort |
highly selective sub–10 ppm h2s gas sensors based on ag-doped cacu3ti4o12 films |
| url |
http://hdl.handle.net/20.500.12110/paper_09254005_v260_n_p571_Natkaeo |
| work_keys_str_mv |
AT natkaeoa highlyselectivesub10ppmh2sgassensorsbasedonagdopedcacu3ti4o12films AT phokharatkuld highlyselectivesub10ppmh2sgassensorsbasedonagdopedcacu3ti4o12films AT hodakjh highlyselectivesub10ppmh2sgassensorsbasedonagdopedcacu3ti4o12films AT wisitsoraata highlyselectivesub10ppmh2sgassensorsbasedonagdopedcacu3ti4o12films AT hodaksk highlyselectivesub10ppmh2sgassensorsbasedonagdopedcacu3ti4o12films |
| _version_ |
1807318124858441728 |