| Abstract
| - We have fabricated multiwalled carbon nanotubes (CNTs) with flowing acetylene, usinga well-ordered porous anodic aluminum oxide (AAO) nanotemplate with or without depositionof Co in the pores as a catalyst. Without deposition of Co, the tubes were made in the poreshaving the shape of the pores by catalysis with the alumina of the AAO templates. Withdeposition of Co, both alumina and Co could work as a catalyst. By widening the pores afterCo deposition, tubes grow out from the pores, by forming a tube-in-tube, which could beused for electrochemical energy storage. Since the alumina of the AAO templates works asa catalyst, one can fabricate special shapes of CNTs by designing the pores of AAO templates.We have succeeded for the first time to fabricate linearly joined CNTs by using AAOtemplates prepared by using pore widening and multianodization techniques. The electronicproperties of the linearly joined CNTs will be affected critically by the junctions that containfive- and seven-membered carbon ring defects and could be controlled by changing the ratioof the two diameters of them. A schematic to fabricate FET (field-effect transistor) usingthe linearly joined CNTs fabricated on AAO templates has been suggested.
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