A Solid-State Thin-Film Ag/AgCl Reference Electrode Coated with Graphene Oxide and Its Use in a pH Sensor
In this study, we describe a novel solid-state thin-film Ag/AgCl reference electrode (SSRE) that was coated with a protective layer of graphene oxide (GO). This layer was prepared by drop casting a solution of GO on the Ag/AgCl thin film. The potential differences exhibited by the SSRE were less tha...
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| Format: | Article |
| Language: | English |
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MDPI AG
2015-03-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/15/3/6469 |
| _version_ | 1797999190585901056 |
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| author | Tae Yong Kim Sung A Hong Sung Yang |
| author_facet | Tae Yong Kim Sung A Hong Sung Yang |
| author_sort | Tae Yong Kim |
| collection | DOAJ |
| description | In this study, we describe a novel solid-state thin-film Ag/AgCl reference electrode (SSRE) that was coated with a protective layer of graphene oxide (GO). This layer was prepared by drop casting a solution of GO on the Ag/AgCl thin film. The potential differences exhibited by the SSRE were less than 2 mV for 26 days. The cyclic voltammograms of the SSRE were almost similar to those of a commercial reference electrode, while the diffusion coefficient of Fe(CN)63− as calculated from the cathodic peaks of the SSRE was 6.48 × 10−6 cm2/s. The SSRE was used in conjunction with a laboratory-made working electrode to determine its suitability for practical use. The average pH sensitivity of this combined sensor was 58.5 mV/pH in the acid-to-base direction; the correlation coefficient was greater than 0.99. In addition, an integrated pH sensor that included the SSRE was packaged in a secure digital (SD) card and tested. The average sensitivity of the chip was 56.8 mV/pH, with the correlation coefficient being greater than 0.99. In addition, a pH sensing test was also performed by using a laboratory-made potentiometer, which showed a sensitivity of 55.4 mV/pH, with the correlation coefficient being greater than 0.99. |
| first_indexed | 2024-04-11T11:00:45Z |
| format | Article |
| id | doaj.art-4f00d1b07cb4480b9a8b4c4c2e3f20b7 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-11T11:00:45Z |
| publishDate | 2015-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-4f00d1b07cb4480b9a8b4c4c2e3f20b72022-12-22T04:28:37ZengMDPI AGSensors1424-82202015-03-011536469648210.3390/s150306469s150306469A Solid-State Thin-Film Ag/AgCl Reference Electrode Coated with Graphene Oxide and Its Use in a pH SensorTae Yong Kim0Sung A Hong1Sung Yang2Department of Medical System Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, KoreaDepartment of Medical System Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, KoreaDepartment of Medical System Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 500-712, KoreaIn this study, we describe a novel solid-state thin-film Ag/AgCl reference electrode (SSRE) that was coated with a protective layer of graphene oxide (GO). This layer was prepared by drop casting a solution of GO on the Ag/AgCl thin film. The potential differences exhibited by the SSRE were less than 2 mV for 26 days. The cyclic voltammograms of the SSRE were almost similar to those of a commercial reference electrode, while the diffusion coefficient of Fe(CN)63− as calculated from the cathodic peaks of the SSRE was 6.48 × 10−6 cm2/s. The SSRE was used in conjunction with a laboratory-made working electrode to determine its suitability for practical use. The average pH sensitivity of this combined sensor was 58.5 mV/pH in the acid-to-base direction; the correlation coefficient was greater than 0.99. In addition, an integrated pH sensor that included the SSRE was packaged in a secure digital (SD) card and tested. The average sensitivity of the chip was 56.8 mV/pH, with the correlation coefficient being greater than 0.99. In addition, a pH sensing test was also performed by using a laboratory-made potentiometer, which showed a sensitivity of 55.4 mV/pH, with the correlation coefficient being greater than 0.99.http://www.mdpi.com/1424-8220/15/3/6469Ag/AgClreference electrodepH sensorgraphene oxideiridium oxide pH working electrodepotentiometer |
| spellingShingle | Tae Yong Kim Sung A Hong Sung Yang A Solid-State Thin-Film Ag/AgCl Reference Electrode Coated with Graphene Oxide and Its Use in a pH Sensor Sensors Ag/AgCl reference electrode pH sensor graphene oxide iridium oxide pH working electrode potentiometer |
| title | A Solid-State Thin-Film Ag/AgCl Reference Electrode Coated with Graphene Oxide and Its Use in a pH Sensor |
| title_full | A Solid-State Thin-Film Ag/AgCl Reference Electrode Coated with Graphene Oxide and Its Use in a pH Sensor |
| title_fullStr | A Solid-State Thin-Film Ag/AgCl Reference Electrode Coated with Graphene Oxide and Its Use in a pH Sensor |
| title_full_unstemmed | A Solid-State Thin-Film Ag/AgCl Reference Electrode Coated with Graphene Oxide and Its Use in a pH Sensor |
| title_short | A Solid-State Thin-Film Ag/AgCl Reference Electrode Coated with Graphene Oxide and Its Use in a pH Sensor |
| title_sort | solid state thin film ag agcl reference electrode coated with graphene oxide and its use in a ph sensor |
| topic | Ag/AgCl reference electrode pH sensor graphene oxide iridium oxide pH working electrode potentiometer |
| url | http://www.mdpi.com/1424-8220/15/3/6469 |
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