Electrochemical L-Tyrosine Sensor Based on a Glassy Carbon Electrode Modified with Exfoliated Graphene
In this study, a graphene sample (EGr) was synthesized by electrochemical exfoliation of graphite rods in electrolyte solution containing 0.1 M ammonia and 0.1 M ammonium thiocyanate. The morphology of the powder deposited onto a solid substrate was investigated by the scanning electron microscopy (...
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MDPI AG
2022-05-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/10/3606 |
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| author | Codruţa Varodi Florina Pogăcean Maria Coroş Alexandra Ciorîță Stela Pruneanu |
| author_facet | Codruţa Varodi Florina Pogăcean Maria Coroş Alexandra Ciorîță Stela Pruneanu |
| author_sort | Codruţa Varodi |
| collection | DOAJ |
| description | In this study, a graphene sample (EGr) was synthesized by electrochemical exfoliation of graphite rods in electrolyte solution containing 0.1 M ammonia and 0.1 M ammonium thiocyanate. The morphology of the powder deposited onto a solid substrate was investigated by the scanning electron microscopy (SEM) technique. The SEM micrographs evidenced large and smooth areas corresponding to the basal plane of graphene as well as white lines (edges) where graphene layers fold-up. The high porosity of the material brings a major advantage, such as the increase of the active area of the modified electrode (EGr/GC) in comparison with that of bare glassy carbon (GC). The graphene modified electrode was successfully tested for L-tyrosine detection and the results were compared with those of bare GC. For EGr/GC, the oxidation peak of L-tyrosine had high intensity (1.69 × 10<sup>−5</sup> A) and appeared at lower potential (+0.64 V) comparing with that of bare GC (+0.84 V). In addition, the graphene-modified electrode had a considerably larger sensitivity (0.0124 A/M) and lower detection limit (1.81 × 10<sup>−6</sup> M), proving the advantages of employing graphene in electrochemical sensing. |
| first_indexed | 2024-03-10T01:54:40Z |
| format | Article |
| id | doaj.art-169e14acc1234e7b9fce88de09a39bcb |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T01:54:40Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-169e14acc1234e7b9fce88de09a39bcb2023-11-23T12:58:07ZengMDPI AGSensors1424-82202022-05-012210360610.3390/s22103606Electrochemical L-Tyrosine Sensor Based on a Glassy Carbon Electrode Modified with Exfoliated GrapheneCodruţa Varodi0Florina Pogăcean1Maria Coroş2Alexandra Ciorîță3Stela Pruneanu4National Institute for Research and Development of Isotopic and Molecular Technologies, Donat Street, No. 67-103, 400293 Cluj-Napoca, RomaniaNational Institute for Research and Development of Isotopic and Molecular Technologies, Donat Street, No. 67-103, 400293 Cluj-Napoca, RomaniaNational Institute for Research and Development of Isotopic and Molecular Technologies, Donat Street, No. 67-103, 400293 Cluj-Napoca, RomaniaNational Institute for Research and Development of Isotopic and Molecular Technologies, Donat Street, No. 67-103, 400293 Cluj-Napoca, RomaniaNational Institute for Research and Development of Isotopic and Molecular Technologies, Donat Street, No. 67-103, 400293 Cluj-Napoca, RomaniaIn this study, a graphene sample (EGr) was synthesized by electrochemical exfoliation of graphite rods in electrolyte solution containing 0.1 M ammonia and 0.1 M ammonium thiocyanate. The morphology of the powder deposited onto a solid substrate was investigated by the scanning electron microscopy (SEM) technique. The SEM micrographs evidenced large and smooth areas corresponding to the basal plane of graphene as well as white lines (edges) where graphene layers fold-up. The high porosity of the material brings a major advantage, such as the increase of the active area of the modified electrode (EGr/GC) in comparison with that of bare glassy carbon (GC). The graphene modified electrode was successfully tested for L-tyrosine detection and the results were compared with those of bare GC. For EGr/GC, the oxidation peak of L-tyrosine had high intensity (1.69 × 10<sup>−5</sup> A) and appeared at lower potential (+0.64 V) comparing with that of bare GC (+0.84 V). In addition, the graphene-modified electrode had a considerably larger sensitivity (0.0124 A/M) and lower detection limit (1.81 × 10<sup>−6</sup> M), proving the advantages of employing graphene in electrochemical sensing.https://www.mdpi.com/1424-8220/22/10/3606L-tyrosineelectrochemical exfoliationgraphene-modified electrode |
| spellingShingle | Codruţa Varodi Florina Pogăcean Maria Coroş Alexandra Ciorîță Stela Pruneanu Electrochemical L-Tyrosine Sensor Based on a Glassy Carbon Electrode Modified with Exfoliated Graphene Sensors L-tyrosine electrochemical exfoliation graphene-modified electrode |
| title | Electrochemical L-Tyrosine Sensor Based on a Glassy Carbon Electrode Modified with Exfoliated Graphene |
| title_full | Electrochemical L-Tyrosine Sensor Based on a Glassy Carbon Electrode Modified with Exfoliated Graphene |
| title_fullStr | Electrochemical L-Tyrosine Sensor Based on a Glassy Carbon Electrode Modified with Exfoliated Graphene |
| title_full_unstemmed | Electrochemical L-Tyrosine Sensor Based on a Glassy Carbon Electrode Modified with Exfoliated Graphene |
| title_short | Electrochemical L-Tyrosine Sensor Based on a Glassy Carbon Electrode Modified with Exfoliated Graphene |
| title_sort | electrochemical l tyrosine sensor based on a glassy carbon electrode modified with exfoliated graphene |
| topic | L-tyrosine electrochemical exfoliation graphene-modified electrode |
| url | https://www.mdpi.com/1424-8220/22/10/3606 |
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