成果報告書詳細
管理番号20130000000878
タイトル*平成24年度中間年報 低炭素社会を実現する革新的カーボンナノチューブ複合材料開発プロジェクト グラフェン基盤研究開発 ショウノウを活用した単結晶グラフェンの研究開発(1)
公開日2013/10/22
報告書年度2012 - 2012
委託先名国立大学法人名古屋工業大学
プロジェクト番号P10024
部署名電子・材料・ナノテクノロジー部
和文要約
英文要約Title: Development of Innovative Carbon Nanotube Composite Materials for a Low Carbon Emission Society
Project for Basic Research and Development of Graphene
R&D of Single Crystal Graphenes by Camphor
Sub contract Name: Nagoya Institute of Technology
(FY2012-FY2013) FY2012 Annual Report

(7)-4-2"Evaluation and analysis of the crystal structure and characterization of graphene"
(7)-4-2-1 Evaluation of the crystal defects in the synthesized graphene
The graphene synthesized by the thermal CVD process using camphor as the source material was analyzed by the Raman studies. The quality of the graphene crystal was evaluated by the intensity ratio of the D and G-band. The 2D Raman peak and full width half maximum (FWHM) of the peak was studied to evaluate the number of graphene layers. Raman mapping studies were performed to evaluate the planner distribution of the defects and number of layer in the synthesized graphene sample. The FWHM was distributed in the range of 35-50cm-1, presenting monolayer few-layers graphene formation. Most of the area of the sample contains few-layer graphene along with the monolayer graphene. The defect induced D band was negligible in the graphene sample indicating low defect and high quality graphene formation. Scanning electron microscopic image of the synthesized graphene film presents a good surface morphology. Since, the quality of the graphene largely depends on the CVD parameters such as synthesis temperature, flow rate, and camphor quantity, significant difference was not verified in the camphor and alcohol CVD process at this moment.
(7)-4-2-2 Structural evaluation of graphene
 In addition, we were succeeded to synthesis single crystal graphene by improving the synthesis parameters such as hydrogenation on a copper foil by the camphor CVD process. It was observed that he graphene crystals were hexagonal shaped and formed on the grain and twin boundaries of the copper foil. Raman mapping image of the single crystal graphene shows that it was observed that the IG/I2D and ID/IG ratio is uniform in a single graphene crystal. Transmission electron microscopy image shows a single layer graphene with single crystal nature.
(7)-4-3 "Transfer of the transparent conducting graphene film "
(7)-4-3-1 Evaluation of graphene conductivity
The conductivity of the graphene films synthesized by the camphor and alcohol CVD process was evaluated by transferring to a glass and silicon substrate. The graphene film was separated by etching the metal substrate. After the etching the graphene film was transferred to the silicone rubber substrate. A graphene film synthesized on copper foil was transferred to a glass substrate, which showed a sheet resistance of about 2.5kΩ/□. Again, a graphene film showed a transmittance of about 85% at 550nm.
(7)-4-3-2 Development of high efficiency transfer
The etching of the metal substrate after the growth of the graphene film was achieved by immersing in the diluted nitric acid for 24 hours. The graphene film synthesized using camphor as starting material was transferred to the Si substrate and analyzed with Raman mapping. The Raman mapping image shows comparable graphene Raman spectra before and after the transfer was obtained by improving the etching process.
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