Transformation of chemical vapor deposited individual graphene crystal with oxidation of copper substrate |
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| Affiliation: | 1. Center for Fostering Young and Innovative Researchers, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan;2. Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan;1. Center for Advanced Research in the Engineering Sciences, Texas Tech University, Lubbock, TX 79409, USA;2. School of Aeronautic Science and Engineering, Beihang University, Beijing, China;1. SRM Research Institute & Department of Physics and Nanotechnology, SRM University, Kattankulathur 603203, Tamil Nadu, India;2. Department of Physics, National Institute of Technology Agartala, Jirania, West Tripura 799 046, India;1. Department of Materials and Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung, Taiwan, ROC;2. School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang, 110034, PR China;3. School of Mechanical Engineering, Liaoning Shihua University, Fushun, 113001, PR China;1. Department of Clinical Infectious Diseases, Aichi Medical University, Japan;2. Drug Discovery Research, Astellas Pharma Inc., Japan;1. Korea Aerospace Research Institute, Daejeon 305-806, Republic of Korea;2. Saint-Gobain Research Shanghai Co., Ltd, Wenjing-road, Minhang-district, Shanghai 200245, China;3. Samsung Electronics, Yongin 446-811, Republic of Korea;4. Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea |
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| Abstract: | Here, we reveal the structural transformation process of as-synthesized individual graphene crystals with oxidation of a copper (Cu) foil. We found that the transformation of a graphene crystal with Cu oxidation is significantly different for the thermal annealing and room temperature long-term atmospheric oxidation. Annealing creates large cracks in an individual graphene crystal due to the thermal stress and strain created by rapid oxidation of Cu surface. The cracks are further enhanced with longer annealing duration enabling oxygen diffusion through cracks, thereby accelerating oxidization of Cu. Eventually, the graphene crystals are completely damaged, leaving behind the highly oxidized Cu surface. On the other hand, in case of room temperature long-term atmospheric oxidation, oxygen diffusion occurs underneath of a graphene crystal through the reactive edge without any large cracks formation. The graphene crystals decouple from Cu surface during the oxygen diffusion and oxidation process, however no structural deformation is observed. This finding shows the significant contrast of structural change of graphene crystal and oxidation behaviors of Cu surface with thermal annealing and room temperature atmospheric oxidation. |
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