Journal
RSC ADVANCES
Volume 2, Issue 10, Pages 4364-4369Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra01295b
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Funding
- NNSF of China [50902071, 61076067, BZ2010043]
- National Basic Research Program of China [2009CB930601, 2012CB933300]
- Jiangsu Province Science Foundation for Six Great Talent Peak [RLD201103]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- National Research Foundation of Singapore (CRP) [NRF-CRP-07-2]
- Ministry of Education (AcRF) [MOE2011-T2-2-010]
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A hybrid structure of zinc oxide (ZnO) on three dimensional (3D) graphene foam has been synthesized by chemical vapor deposition (CVD) growth of graphene followed by a facial in situ precipitation of ZnO nanorods under hydrothermal conditions. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) are used to characterize the morphology and structure of graphene/ZnO hybrids. The results show that the ZnO nanorods have high crystallinity and cluster uniformly on graphene skeleton to form flower-like nanostructures. Serving as a free-standing electrode, the electrochemical and biosensing performance of graphene/ZnO hybrids are studied by cyclic voltammetry, electrochemical impedance spectroscopy, galvanostatic charge-discharge and amperometric measurements. It is found that the graphene/ZnO hybrids display superior capacitive performance with high specific capacitance (similar to 400 F g(-1)) as well as excellent cycle life, making them suitable for high-performance energy storage applications. Furthermore, the graphene/ZnO hybrids exhibit high sensitivity for detection of [Fe(CN)(6)](3+) and dopamine, with the extrapolated lower detection limits of similar to 1.0 mu M and similar to 10.0 nM respectively. These results demonstrate the potential of free-standing graphene/ZnO hybrid electrodes for the development of highly sensitive electrochemical sensors.
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