成果報告書詳細
管理番号20100000001555
タイトル*平成21年度中間年報 ナノテク・先端部材実用化研究開発/単層カーボンナノチューブの大量合成と透明電極の研究開発
公開日2011/1/8
報告書年度2009 - 2009
委託先名国立大学法人東京大学 御国色素株式会社 日立化成工業株式会社
プロジェクト番号P05023
部署名ナノテクノロジー・材料技術開発部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等
(1)SWCNT大量合成の研究《東京大学が担当》
(1)-1 触媒・担体の担持《東京大学が担当》
SWCNT大量合成に不可欠な、触媒・担体の新担持技術を確立する。
(1)-1-1 バッチ法による二次元基板上への触媒・担体の担持
CVD法による担体・触媒の担持技術は、SWCNT大量合成に不可欠である。バッチ法にて、有機金属蒸気を原料としたCVD法により二次元基板上にAl2O3担体・Fe触媒を担持し、SWCNTを合成する技術を、平成19年度に確立した。
(1)-1-2 バッチ法による三次元支持体上の触媒・担体の担持
三次元支持体上への触媒担持は、反応器容積あたりのSWCNT合成速度向上に不可欠である。CVD法によるAl2O3担体・Fe触媒の担持技術を、三次元支持体であるセラミックスビーズに適用、ボート上に設置したセラミックスビーズ上への担体・触媒担持とSWCNT合成を平成20年度に確立した。
(1)-1-3 フロー法による三次元支持体上への触媒・担体の担持
フロー法による三次元支持体上への触媒担持は、SWCNT合成を擬連続的に行うために不可欠である。平成20年度は、有機金属のエバポレータを流動層反応装置に接続、Al2O3担体とFe触媒を流動層状態のセラミックスビーズ上に担持して、SWCNTを含むCNTを高さ0.3 mm以上に成長させることに成功、平成20年度に技術を確立した。
英文要約R&D of Mass-Production of Single-Walled Carbon Nanotubes and Their Transparent Electrodes (FY2008-FY2010)FY2009 Annual Report
Single-walled carbon nanotubes (SWCNTs) are a representative nanomaterial that have been extensively researched owing to their unique properties. However, their production method has not been established yet and their application is still very much limited. On the other hand, transparent electrodes are indispensable in display devices and next generation thin film solar cells. The representative, indium tin oxide (ITO) has problems in steady supply of source materials because indium is a rare metal. And oxide transparent electrodes including ITO are expensive due to their fabrication process by sputtering and are not suitable for flexible film applications due to their brittleness. The targets of this project are to develop a low-cost, mass-production process of SWCNTs and to develop a flexible, printable SWCNT transparent electrodes.
The University of Tokyo (UT) takes charge of the mass production process of SWCNTs. In FY2009, UT has improved the semi-continuous fluidized bed process repeating catalyst deposition on ceramics beads by chemical vapor deposition (CVD) for a few min, CNT growth on the ceramic beads by CVD for 10 min, separation of CNTs from the beads by vigorous fluidization for a few min, and removal of remaining carbon on the beads by oxidation for a few min. Operation with 20 cycles in 10 h producing 1 L = 5 g of 0.5-mm-long CNTs with 10 nm diameter and 3 walls in average were established using a reactor with volume as small as about 50 mL. This operation realized carbon yield as high as about 70 at.%.
Mikuni-Color (MC) and UT take charge of the dispersion process of SWCNTs in liquids. In FY2009, MC developed a mild dispersion method of CNTs and achieved the CNT length in suspension as long as 7~8 um. MC also reduced the concentration of the dispersants and realized 0.4 wt.% suspension with dispersants as dilute as 1.0 wt.%. MC estimated the production capacity of practical sonicator as high as 20~30 kg-CNT/day and decided to introduce such sonicator. UT improved sonication process to be milder and developed SWCNT suspension which realizes transparent electrodes of improved performance.
Hitachi-Chemical (HC) and UT take charge of the fabrication process of transparent electrodes using SWCNT suspensions. In FY2009, HC realized the SWCNT thin films with 90% transmittance and 1% haze by spray coating. HC also developed overcoating process of the SWCNT thin films and realized suppressed resistivity increase by 70%. UT improved the vacuum filtration process and realized SWCNT thin films of 300 ohm/sq with 90% transmittance and those of 150 ohm/sq with 80% transmittance.
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