Layer-by-layer growth of graphene layers on graphene substrates by chemical vapor deposition |
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Authors: | Ryota Negishi Hiroki HiranoYasuhide Ohno Kenzo MaehashiKazuhiko Matsumoto Yoshihiro Kobayashi |
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Affiliation: | a Department of applied physics, Osaka University, 2-1 Yamadaoka Suita 565-0871, Japanb The Institute of the Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan |
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Abstract: | We demonstrate a synthesis of graphene layers on graphene templates prepared by the mechanical exfoliation of graphite crystals using a developed chemical vapor deposition (CVD) apparatus that has a furnace with three temperature zones and can regulate the temperatures separately in each zone. This results in individual control over the decomposition reaction of the carbon feedstock and the growth of graphene layers by activated carbon species. CVD growth using multi-temperature zones provides wider temperature windows appropriate to grow graphene layers. We observed that graphene layers proceed by a layer-by-layer growth mode using an optical microscopy, an atomic force microscopy, and Raman spectroscopy. This result suggests that a graphene growth technique using the CVD apparatus is a potential approach for making graphene sheets with precise control of the layer numbers. |
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Keywords: | Graphene Chemical vapor deposition Raman spectroscopy Atomic force microscopy Templating |
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