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이병주,정구환 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.2
We report the effect of repetitive strain on the electrical durability of graphene-based flexible, transparent and conductive films (GTCFs). The graphene is catalytically synthesized on a Ni thin film by using thermal chemical vapor deposition. The synthesized graphene is transferred to a SiO<sub>2-</sub> covered Si wafer and transparent polymeric substrate through wet etching of the growth substrates. We confirm that monolayer graphene is formed with areal coverage of ∼80%. The ransmittance and the sheet resistance of the fabricated GTCFs are 75.5% at a 550-nm wavelength and 730 Ω/sq., respectively. We investigate the durability of the electrical properties of the GTCFs against repetitive strain loading. We confirm that the GTCFs are electrically stable under a cyclic strain of up to 20%. The sheet resistance of the GTCFs increases with increasing applied strain and number of loading cycles. The cracks that are formed by the cyclic strain are responsible for the decreased electrical performance.
Atmospheric pressure plasma treatment on graphene grown by chemical vapor deposition
이병주,조순천,정구환 한국물리학회 2015 Current Applied Physics Vol.15 No.5
We demonstrate the surface treatment of graphene using an atmospheric pressure plasma jet (APPJ) system. The graphene was synthesized by a thermal chemical vapor deposition with methane gas. A Mo foil and a SiO2 wafer covered by Ni films were employed to synthesize monolayer and mixed-layered graphene, respectively. The home-built APPJ system was ignited using nitrogen gas to functionalize the graphene surface, and we studied the effect of different treatment times and interdistance between the plasma jet and the graphene surface. After the APPJ treatment, the hydrophobic character of graphene surface changed to hydrophilic. We found that the change is due to the formation of functionalities such as hydroxyl and carboxyl groups. Furthermore, it is worth noting that the nitrogen plasma treatment induced charge doping on graphene, and the pyridinic nitrogen component in the X-ray photoelectron spectroscopy spectrum was significantly enhanced. We conclude that the atmospheric pressure plasma treatment enables controlling the graphene properties without introducing surface defects.