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Pyrolytic preparation of gold nanoparticle-coated taro carbon and its application for selective detection of dopamine

Abstract

A highly selective and sensitive electrochemical method was developed for the detection of dopamine (DA), based on a gold nanoparticle (AuNP)-coated taro carbon (TC)-modified glassy carbon electrode (AuNP-TC/GCE). This novel AuNP-TC material was simply prepared by carrying out a pyrolysis of composite material obtained by treating of HAuCl4 and an acid treated taro stem powder. Transmission electron microscopy (TEM), Raman spectroscopy, field-emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) were employed to characterize the AuNP-TC material. Electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) were used to characterize the modified electrode. The modified GCE exhibited a well-defined current response only toward the electrochemical oxidation of DA in the mixture solution of ascorbic acid (AA), DA, uric acid (UA). This designed electrochemical sensor showed a linear response in the concentration range 0.5 µM to 250 µM DA and found a sensing limit (S/N=3) of 0.25 µM. The sensor was also able to successfully detect DA in a dopamine hydrochloride injection (DAI). Moreover, the sensor exhibited excellent stability and reproducibility.

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Publication details

The article was received on 06 Dec 2017, accepted on 08 Feb 2018 and first published on 08 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04777K
Citation: New J. Chem., 2018, Accepted Manuscript
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    Pyrolytic preparation of gold nanoparticle-coated taro carbon and its application for selective detection of dopamine

    A. J. S. Ahammad, Md. M. Hasan, T. Islam, M. O. Al-Shehri, A. N. Anju, Md. K. Alam, J. P. Kim, M. A. A. Qasem and Md. A. Aziz, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04777K

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