Electrochemical Behavior of Gold Nanoparticles Modified Nitrogen Incorporated Tetrahedral Amorphous Carbon and Its Application in Glucose Sensing

Authors: Liu, Aiping; Wu, Huaping; Qiu, Xu; Tang, Weihua

Source: Journal of Nanoscience and Nanotechnology, Volume 11, Number 12, December 2011 , pp. 11064-11068(5)

Publisher: American Scientific Publishers

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Gold nanoparticles (NPs) with 10–50 nm in diameter were synthesized on nitrogen incorporated tetrahedral amorphous carbon (ta-C:N) thin film electrode by electrodeposition. The deposition and nucleation processes of Au on ta-C:N surface were investigated by cyclic voltammetry and chronoamperometry. The morphology of Au NPs was characterized by scanned electron microscopy. The electrochemical properties of Au NPs modified ta-C:N (ta-C:N/Au) electrode and its ability to sense glucose were investigated by voltammetric and amperometric measurements. The potentiostatic current-time transients showed a progressive nucleation process and diffusion growth of Au on the surface of ta-C:N film according to the Scharifker-Hills model. The Au NPs acted as microelectrodes improved the electron transfer and electrocatalytic oxidation of glucose on ta-C:N electrode. The ta-C:N/Au electrode exhibited fast current response, a linear detection range of glucose from 0.5 to 25 mM and a detection limit of 120 μM, which hinted its potential application as a glucose biosensor.
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