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Jiang Yang, Shengyuan Deng, Jianping Lei, Huangxian Ju, Sundaram Gunasekaran
Biosensors and Bioelectronics, Volume 29, Issue 1, November 2011
Abstract
A simple, fast, green and controllable approach was developed for electrochemical synthesis of a novel nanocomposite of electrochemically reduced graphene oxide (ERGO) and gold–palladium (1:1) bimetallic nanoparticles (AuPdNPs), without the aid of any reducing reagent. The electrochemical reduction efficiently removed oxygen-containing groups in ERGO, which was then modified with homogeneously dispersed AuPdNPs in a good size distribution. ERGO–AuPdNPs nanocomposite showed excellent biocompatibility, enhanced electron transfer kinetics and large electroactive surface area, and were highly sensitive and stable towards oxygen reduction. A biosensor was constructed by immobilizing glucose oxidase as a model enzyme on the nanocomposites for glucose detection through oxygen consumption during the enzymatic reaction. The biosensor had a detection limit of 6.9 μM, a linear range up to 3.5 mM and a sensitivity of 266.6 μA mM−1 cm−2. It exhibited acceptable reproducibility and good accuracy with negligible interferences from common oxidizable interfering species. These characteristics make ERGO–AuPdNPs nanocomposite highly suitable for oxidase-based biosensing.
We used a fast, green and controllable electrochemical approach to effectively reduce the graphene oxide and to in situ synthesize AuPd bimetallic nanoparticles on the reduced graphene oxide scaffolds. The as-synthesized nanocomposite materials showed excellent oxygen reduction reaction. This property enables using it as fuel cells and oxidase-based biosensors. Compared with other synthesis approaches, this method is simple, rapid, and inexpensive. The synthesis strategy can be explored for other metal, metal alloy or metal oxide nanocomposite materials, which can be extensively used in electronics, supercapacitors, fuel cells, catalytic scaffolds and biosensing.
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