Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 206, Issue -, Pages 592-600Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.10.009
Keywords
Graphene nanodots; Porous gold; OSWV; Heavy metal ion detection; Ion beam sputtering deposition
Funding
- Natural Science Foundation of China [51173087]
- Natural Science Foundation of Shandong [ZR2011EMM001]
- Taishan Scholars Program
- Deakin CRGS funds
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A graphene nanodots-encaged porous gold electrode via ion beam sputtering deposition (IBSD) for electrochemical sensing is presented. The electrodes were fabricated using Au target, and a composite target of Al and graphene, which were simultaneously sputtered onto glass substrates by Ar ion beam, followed with hydrochloric acid corrosion. The as-prepared graphene nanodots-encaged porous gold electrodes were then used for the analysis of heavy metal ions, e.g. Cu2+ and Pb2+ by Osteryoung square wave voltammetry (OSWV). These porous electrodes exhibited enhanced detection range for the heavy metal ions due to the entrapped graphene nanodots in 3-D porous structure. In addition, it was also found that when the thickness of porous electrode reached 40 nm the detection sensitivity came into saturation. The linear detection range is 0.009-4 mu M for Cu2+ and 0.006-2.5 mu M for Pb2+. Good reusability and repeatability were also observed. The formation mechanism and 3-D structure of the porous electrode were also investigated using scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectra (XPS). This graphene entrapped 3-D porous structure may envision promising applications in sensing devices. (C) 2014 Elsevier B.V. All rights reserved.
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