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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Main Authors: Ibrahim, Izwaharyanie, Lim, Hong Ngee, Nay, Ming Huang
Format: Article
Language:English
Published: Elsevier 2020
Online Access: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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spelling 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
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
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.
format Article
author Ibrahim, Izwaharyanie
Lim, Hong Ngee
Nay, Ming Huang
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
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
publisher Elsevier
publishDate 2020
url 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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score 13.18916