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...
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my.upm.eprints.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 |
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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. |
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Article |
author |
Ibrahim, Izwaharyanie Lim, Hong Ngee Nay, Ming Huang |
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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 |
author_facet |
Ibrahim, Izwaharyanie Lim, Hong Ngee Nay, Ming Huang |
author_sort |
Ibrahim, Izwaharyanie |
title |
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_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_sort |
in-situ formation of electron acceptor to inhibit charge separation of photo-electrochemical sensor of dopamine-based cds/au/gqds |
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Elsevier |
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2020 |
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http://psasir.upm.edu.my/id/eprint/89406/1/DOPA.pdf http://psasir.upm.edu.my/id/eprint/89406/ https://www.sciencedirect.com/science/article/pii/S0013468620314067 |
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