Regulating optoelectronics of carbon dots with redox-active dopamine
The electron transfer (ET) processes in carbon-based quantum dots (CDs) have laid to extensive research endeavors due to their tunable optoelectronic properties with alteration in surface functionalization, doping, surface charge, etc. Here, we proffer shreds of evidence on pH-dependent electron tra...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-08-01
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| Series: | Talanta Open |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S266683192300019X |
| _version_ | 1797811097060769792 |
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| author | Aradhana Panigrahi Ranjan Kumar Behera Leepsa Mishra Priyanka Dubey Soumi Dutta Manas Kumar Sarangi |
| author_facet | Aradhana Panigrahi Ranjan Kumar Behera Leepsa Mishra Priyanka Dubey Soumi Dutta Manas Kumar Sarangi |
| author_sort | Aradhana Panigrahi |
| collection | DOAJ |
| description | The electron transfer (ET) processes in carbon-based quantum dots (CDs) have laid to extensive research endeavors due to their tunable optoelectronic properties with alteration in surface functionalization, doping, surface charge, etc. Here, we proffer shreds of evidence on pH-dependent electron transfer and transport properties of undoped CDs (UCDs) and amine-doped CDs (ACDs) with a redox-active neurotransmitter, dopamine (DA). A pronounced pH-dependent photoluminescence (PL) quenching is depicted for both the CDs with DA, where the quenching efficiency substantially increases in alkaline solvents. Taking advantage of the structural transformation of DA from hydroquinone to quinone, the electron accepting capacity can be improved for alkaline pH, which enhances the ET efficiency. The pH-regulated conductance measurements across the metal-CD-metal junction reveal a hike in the conductivity for acidic and alkaline pH relative to the neutral one. The I-V traces of UCDs and ACDs are contributed by an initial linear current rise and non-linear growth at higher bias explicating both direct and Fowler-Nordheim (F-N) tunneling mechanisms. In addition, the incorporation of DA into these CDs, not only significantly increases conductance in all pH media but also enables them to tunnel the potential barrier directly in acidic media, reducing F-N tunneling. These results could provide new avenues for developing reliable optoelectronic devices and sensing probes for a wide range of applications. |
| first_indexed | 2024-03-13T07:17:37Z |
| format | Article |
| id | doaj.art-f2eb1106e4d24128b5661926c233462a |
| institution | Directory Open Access Journal |
| issn | 2666-8319 |
| language | English |
| last_indexed | 2024-03-13T07:17:37Z |
| publishDate | 2023-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Talanta Open |
| spelling | doaj.art-f2eb1106e4d24128b5661926c233462a2023-06-05T04:13:16ZengElsevierTalanta Open2666-83192023-08-017100198Regulating optoelectronics of carbon dots with redox-active dopamineAradhana Panigrahi0Ranjan Kumar Behera1Leepsa Mishra2Priyanka Dubey3Soumi Dutta4Manas Kumar Sarangi5Department of Physics, Indian Institute of Technology, Patna, India 801106Department of Physics, Indian Institute of Technology, Patna, India 801106Department of Physics, Indian Institute of Technology, Patna, India 801106Department of Physics, Indian Institute of Technology, Patna, India 801106Department of Physics, Indian Institute of Technology, Patna, India 801106Corresponding author.; Department of Physics, Indian Institute of Technology, Patna, India 801106The electron transfer (ET) processes in carbon-based quantum dots (CDs) have laid to extensive research endeavors due to their tunable optoelectronic properties with alteration in surface functionalization, doping, surface charge, etc. Here, we proffer shreds of evidence on pH-dependent electron transfer and transport properties of undoped CDs (UCDs) and amine-doped CDs (ACDs) with a redox-active neurotransmitter, dopamine (DA). A pronounced pH-dependent photoluminescence (PL) quenching is depicted for both the CDs with DA, where the quenching efficiency substantially increases in alkaline solvents. Taking advantage of the structural transformation of DA from hydroquinone to quinone, the electron accepting capacity can be improved for alkaline pH, which enhances the ET efficiency. The pH-regulated conductance measurements across the metal-CD-metal junction reveal a hike in the conductivity for acidic and alkaline pH relative to the neutral one. The I-V traces of UCDs and ACDs are contributed by an initial linear current rise and non-linear growth at higher bias explicating both direct and Fowler-Nordheim (F-N) tunneling mechanisms. In addition, the incorporation of DA into these CDs, not only significantly increases conductance in all pH media but also enables them to tunnel the potential barrier directly in acidic media, reducing F-N tunneling. These results could provide new avenues for developing reliable optoelectronic devices and sensing probes for a wide range of applications.http://www.sciencedirect.com/science/article/pii/S266683192300019XElectron transferCarbon dotsDopamineConducting atomic force microscopyTunneling mechanism |
| spellingShingle | Aradhana Panigrahi Ranjan Kumar Behera Leepsa Mishra Priyanka Dubey Soumi Dutta Manas Kumar Sarangi Regulating optoelectronics of carbon dots with redox-active dopamine Talanta Open Electron transfer Carbon dots Dopamine Conducting atomic force microscopy Tunneling mechanism |
| title | Regulating optoelectronics of carbon dots with redox-active dopamine |
| title_full | Regulating optoelectronics of carbon dots with redox-active dopamine |
| title_fullStr | Regulating optoelectronics of carbon dots with redox-active dopamine |
| title_full_unstemmed | Regulating optoelectronics of carbon dots with redox-active dopamine |
| title_short | Regulating optoelectronics of carbon dots with redox-active dopamine |
| title_sort | regulating optoelectronics of carbon dots with redox active dopamine |
| topic | Electron transfer Carbon dots Dopamine Conducting atomic force microscopy Tunneling mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S266683192300019X |
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