Time-Dependent Sensitivity Tunable pH Sensors Based on the Organic-Inorganic Hybrid Electric-Double-Layer Transistor
In this study, we propose tunable pH sensors based on the electric-double-layer transistor (EDLT) with time-dependent sensitivity characteristics. The EDLT is able to modulate the drain current by using the mobile ions inside the electrolytic gate dielectric. This property allows the implementation...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-09-01
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| Series: | International Journal of Molecular Sciences |
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| Online Access: | https://www.mdpi.com/1422-0067/23/18/10842 |
| _version_ | 1797487089083744256 |
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| author | Ki-Woong Park Won-Ju Cho |
| author_facet | Ki-Woong Park Won-Ju Cho |
| author_sort | Ki-Woong Park |
| collection | DOAJ |
| description | In this study, we propose tunable pH sensors based on the electric-double-layer transistor (EDLT) with time-dependent sensitivity characteristics. The EDLT is able to modulate the drain current by using the mobile ions inside the electrolytic gate dielectric. This property allows the implementation of a device with sensitivity characteristics that are simply adjusted according to the measurement time. An extended gate-type, ion-sensitive, field-effect transistor consisting of a chitosan/Ta<sub>2</sub>O<sub>5</sub> hybrid dielectric EDLT transducer, and an SnO<sub>2</sub> sensing membrane, were fabricated to evaluate the sensing behavior at different buffer pH levels. As a result, we were able to achieve tunable sensitivity by only adjusting the measurement time by using a single EDLT and without additional gate electrodes. In addition, to demonstrate the unique sensing behavior of the time-dependent tunable pH sensors based on organic–inorganic hybrid EDLT, comparative sensors consisting of a normal FET with a SiO<sub>2</sub> gate dielectric were prepared. It was found that the proposed pH sensors exhibit repeatable and stable sensing operations with drain current deviations <1%. Therefore, pH sensors using a chitosan electrolytic EDLT are suitable for biosensor platforms, possessing tunable sensitivity and high-reliability characteristics. |
| first_indexed | 2024-03-09T23:42:59Z |
| format | Article |
| id | doaj.art-8b4eaf8d73034f1abdbfa72ff9406578 |
| institution | Directory Open Access Journal |
| issn | 1661-6596 1422-0067 |
| language | English |
| last_indexed | 2024-03-09T23:42:59Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | International Journal of Molecular Sciences |
| spelling | doaj.art-8b4eaf8d73034f1abdbfa72ff94065782023-11-23T16:49:02ZengMDPI AGInternational Journal of Molecular Sciences1661-65961422-00672022-09-0123181084210.3390/ijms231810842Time-Dependent Sensitivity Tunable pH Sensors Based on the Organic-Inorganic Hybrid Electric-Double-Layer TransistorKi-Woong Park0Won-Ju Cho1Department of Electronic Materials Engineering, Kwangwoon University, 447-1 Wolgye-dong, Nowon-gu, Seoul 139-701, KoreaDepartment of Electronic Materials Engineering, Kwangwoon University, 447-1 Wolgye-dong, Nowon-gu, Seoul 139-701, KoreaIn this study, we propose tunable pH sensors based on the electric-double-layer transistor (EDLT) with time-dependent sensitivity characteristics. The EDLT is able to modulate the drain current by using the mobile ions inside the electrolytic gate dielectric. This property allows the implementation of a device with sensitivity characteristics that are simply adjusted according to the measurement time. An extended gate-type, ion-sensitive, field-effect transistor consisting of a chitosan/Ta<sub>2</sub>O<sub>5</sub> hybrid dielectric EDLT transducer, and an SnO<sub>2</sub> sensing membrane, were fabricated to evaluate the sensing behavior at different buffer pH levels. As a result, we were able to achieve tunable sensitivity by only adjusting the measurement time by using a single EDLT and without additional gate electrodes. In addition, to demonstrate the unique sensing behavior of the time-dependent tunable pH sensors based on organic–inorganic hybrid EDLT, comparative sensors consisting of a normal FET with a SiO<sub>2</sub> gate dielectric were prepared. It was found that the proposed pH sensors exhibit repeatable and stable sensing operations with drain current deviations <1%. Therefore, pH sensors using a chitosan electrolytic EDLT are suitable for biosensor platforms, possessing tunable sensitivity and high-reliability characteristics.https://www.mdpi.com/1422-0067/23/18/10842ion-sensitive field-effect transistor (ISFET)tunable sensitivityorganic–inorganic electric-double-layer transistorchitosan electrolyteextended gateamorphous oxide semiconductor |
| spellingShingle | Ki-Woong Park Won-Ju Cho Time-Dependent Sensitivity Tunable pH Sensors Based on the Organic-Inorganic Hybrid Electric-Double-Layer Transistor International Journal of Molecular Sciences ion-sensitive field-effect transistor (ISFET) tunable sensitivity organic–inorganic electric-double-layer transistor chitosan electrolyte extended gate amorphous oxide semiconductor |
| title | Time-Dependent Sensitivity Tunable pH Sensors Based on the Organic-Inorganic Hybrid Electric-Double-Layer Transistor |
| title_full | Time-Dependent Sensitivity Tunable pH Sensors Based on the Organic-Inorganic Hybrid Electric-Double-Layer Transistor |
| title_fullStr | Time-Dependent Sensitivity Tunable pH Sensors Based on the Organic-Inorganic Hybrid Electric-Double-Layer Transistor |
| title_full_unstemmed | Time-Dependent Sensitivity Tunable pH Sensors Based on the Organic-Inorganic Hybrid Electric-Double-Layer Transistor |
| title_short | Time-Dependent Sensitivity Tunable pH Sensors Based on the Organic-Inorganic Hybrid Electric-Double-Layer Transistor |
| title_sort | time dependent sensitivity tunable ph sensors based on the organic inorganic hybrid electric double layer transistor |
| topic | ion-sensitive field-effect transistor (ISFET) tunable sensitivity organic–inorganic electric-double-layer transistor chitosan electrolyte extended gate amorphous oxide semiconductor |
| url | https://www.mdpi.com/1422-0067/23/18/10842 |
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