In-situ formation of electron acceptor to inhibit charge separation of photo-electrochemical sensor of dopamine-based CdS/Au/GQDs
A versatile photo-electrochemical (PEC) sensor protocol was established to quantitatively monitor dopamine (DA) levels by utilizing a triple interconnected structure of cadmium sulfide (CdS) modified with gold and graphene quantum dots (Au/GQDs). The introduction of Au and GQDs on the photocatalytic...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020
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| Online Access: | http://psasir.upm.edu.my/id/eprint/89406/ http://psasir.upm.edu.my/id/eprint/89406/1/DOPA.pdf |
| _version_ | 1848860846872068096 |
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| author | Ibrahim, Izwaharyanie Lim, Hong Ngee Nay, Ming Huang |
| author_facet | Ibrahim, Izwaharyanie Lim, Hong Ngee Nay, Ming Huang |
| author_sort | Ibrahim, Izwaharyanie |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | A versatile photo-electrochemical (PEC) sensor protocol was established to quantitatively monitor dopamine (DA) levels by utilizing a triple interconnected structure of cadmium sulfide (CdS) modified with gold and graphene quantum dots (Au/GQDs). The introduction of Au and GQDs on the photocatalytic active center of CdS act as a charge separation mediator and photosensitizer, respectively, which are favorable for charge separation and transportation and PEC conversion. When the CdS/Au/GQDs photoelectrode was utilized for DA sensing in a weak alkaline solution, DA was oxidized and converted to poly(dopamine) (PDA), which possesses abundant benzoquinone (BQ) groups that act as electron acceptors. Consequently, the electron acceptors formed in-situ on the surface of the photoelectrode, reducing the anodic photocurrent signal. Under the optimal conditions, the photocurrent decreased when the DA concentration increased in a dynamic working range from 0.1 to 350 µM and with a limit of detection (LoD) of 0.0078 μM. Herein, the proposed strategy involving photoelectron transfer between the electron acceptor and semiconductor provides a new and versatile protocol for PEC sensor development. |
| first_indexed | 2025-11-15T12:51:44Z |
| format | Article |
| id | upm-89406 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T12:51:44Z |
| publishDate | 2020 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-894062021-08-19T08:25:13Z http://psasir.upm.edu.my/id/eprint/89406/ In-situ formation of electron acceptor to inhibit charge separation of photo-electrochemical sensor of dopamine-based CdS/Au/GQDs Ibrahim, Izwaharyanie Lim, Hong Ngee Nay, Ming Huang A versatile photo-electrochemical (PEC) sensor protocol was established to quantitatively monitor dopamine (DA) levels by utilizing a triple interconnected structure of cadmium sulfide (CdS) modified with gold and graphene quantum dots (Au/GQDs). The introduction of Au and GQDs on the photocatalytic active center of CdS act as a charge separation mediator and photosensitizer, respectively, which are favorable for charge separation and transportation and PEC conversion. When the CdS/Au/GQDs photoelectrode was utilized for DA sensing in a weak alkaline solution, DA was oxidized and converted to poly(dopamine) (PDA), which possesses abundant benzoquinone (BQ) groups that act as electron acceptors. Consequently, the electron acceptors formed in-situ on the surface of the photoelectrode, reducing the anodic photocurrent signal. Under the optimal conditions, the photocurrent decreased when the DA concentration increased in a dynamic working range from 0.1 to 350 µM and with a limit of detection (LoD) of 0.0078 μM. Herein, the proposed strategy involving photoelectron transfer between the electron acceptor and semiconductor provides a new and versatile protocol for PEC sensor development. Elsevier 2020 Article PeerReviewed text en http://psasir.upm.edu.my/id/eprint/89406/1/DOPA.pdf Ibrahim, Izwaharyanie and Lim, Hong Ngee and Nay, Ming Huang (2020) In-situ formation of electron acceptor to inhibit charge separation of photo-electrochemical sensor of dopamine-based CdS/Au/GQDs. Electrochimica Acta, 360. art. no. 137013. pp. 1-7. ISSN 0013-4686 https://www.sciencedirect.com/science/article/pii/S0013468620314067 10.1016/j.electacta.2020.137013 |
| spellingShingle | Ibrahim, Izwaharyanie Lim, Hong Ngee Nay, Ming Huang In-situ formation of electron acceptor to inhibit charge separation of photo-electrochemical sensor of dopamine-based CdS/Au/GQDs |
| title | In-situ formation of electron acceptor to inhibit charge separation of photo-electrochemical sensor of dopamine-based CdS/Au/GQDs |
| title_full | In-situ formation of electron acceptor to inhibit charge separation of photo-electrochemical sensor of dopamine-based CdS/Au/GQDs |
| title_fullStr | In-situ formation of electron acceptor to inhibit charge separation of photo-electrochemical sensor of dopamine-based CdS/Au/GQDs |
| title_full_unstemmed | In-situ formation of electron acceptor to inhibit charge separation of photo-electrochemical sensor of dopamine-based CdS/Au/GQDs |
| title_short | In-situ formation of electron acceptor to inhibit charge separation of photo-electrochemical sensor of dopamine-based CdS/Au/GQDs |
| title_sort | in-situ formation of electron acceptor to inhibit charge separation of photo-electrochemical sensor of dopamine-based cds/au/gqds |
| url | http://psasir.upm.edu.my/id/eprint/89406/ http://psasir.upm.edu.my/id/eprint/89406/ http://psasir.upm.edu.my/id/eprint/89406/ http://psasir.upm.edu.my/id/eprint/89406/1/DOPA.pdf |