TITLE

Electrochemical synthesis of a graphene sheet and gold nanoparticle-based nanocomposite, and its application to amperometric sensing of dopamine

AUTHOR(S)
Li, Su-Juan; Deng, De-Hua; Shi, Qi; Liu, Shui-Ren
PUB. DATE
June 2012
SOURCE
Microchimica Acta;Jun2012, Vol. 177 Issue 3/4, p325
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We describe a simple, green and controllable approach for electrochemical synthesis of a nanocomposite made up from electrochemically reduced graphene oxide (ERGO) and gold nanoparticles. This material possesses the specific features of both gold nanoparticles and graphene. Its morphology was characterized by scanning electron microscopy which reveals a homogeneous distribution of gold nanoparticles on the graphene sheets. Cyclic voltammetry was used to evaluate the electrochemical properties of this nanocomposite towards dopamine by modification of it on surface of glassy carbon electrode (GCE). Compared to the bare GCE, the electrode modified with gold nanoparticles, and the electrode modified with ERGO, the one modified with the nanocomposite displays better electrocatalytic activity. Its oxidation peak current is linearly proportional to the concentration of dopamine (DA) in the range from 0.1 to 10 μM, with a detection limit of 0.04 μM (at S/N = 3). The modified electrode also displays good storage stability, reproducibility, and selectivity. [Figure not available: see fulltext.]
ACCESSION #
75163540

 

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