Rapid and Direct Conversion of Graphite Crystals into High‐Yielding,Good‐Quality Graphene by Supercritical Fluid Exfoliation |
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| Authors: | Dinesh Rangappa Dr Koji Sone Dr Mingsheng Wang Dr Ujjal K Gautam Dr Dmitri Golberg Prof Hiroshi Itoh Dr Masaki Ichihara Dr Itaru Honma Prof |
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| Institution: | 1. Energy Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Umezono 1‐1‐1, Tsukuba, Ibaraki 305‐8568 (Japan), Fax: (+81)29‐861‐5799;2. World Premier International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1‐1 Namiki, Tsukuba, Ibaraki, 305‐0044 (Japan);3. Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology, Umezono 1‐1‐1, Tsukuba, Ibaraki 305‐8568 (Japan);4. Material Design & Characterization Lab, Institute for Solid State Physics, University of Tokyo, 5‐1‐5, Kashiwanoha, Kashiwa, Chiba 277‐8581 (Japan) |
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| Abstract: | Graphene has attracted a great deal of attention in recent years due to its unusual electronic, mechanical, and thermal properties. Exploiting graphene properties in a variety of applications requires a chemical approach for the large‐scale production of high‐quality, processable graphene sheets (GS), which has remained an unanswered challenge. Herein, we report a rapid one‐pot supercritical fluid (SCF) exfoliation process for the production of high‐quality, large‐scale, and processable graphene for technological applications. Direct high‐yield conversion of graphite crystals to GS is possible under SCF conditions because of the high diffusivity and solvating power of SCFs, such as ethanol, N‐methyl‐pyrrolidone (NMP), and DMF. For the first time, we report a one‐pot direct conversion of graphite crystals to a high yield of graphene sheets in which about 90–95 % of the exfoliated sheets are <8 layers with approximately 6–10 % monolayers and the remaining 5–10 % are ≥10 layers. |
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| Keywords: | conducting materials exfoliation graphene scanning probe microscopy supercritical fluids |
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