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Koshikawa, Hiroshi; Usui, Hiroaki*; Maekawa, Yasunari
Journal of Membrane Science, 327(1-2), p.182 - 187, 2009/02
Times Cited Count：3 Percentile：16.39(Engineering, Chemical)Hybrid membranes consisting of polyimide (PI) films embedded with copper wires were prepared by electroplating copper into the etched pores of ion track membranes. Electrical resistance of single copper wire, measured by the four-point probe, did not show significant difference with the value estimated from the bulk resistivity. It was also found that the resistance, as well as the hybrid membrane structure, remains stable against thermal treatment of at least up to 400
C. Such anisotropically conducting membranes with high thermal stability are expected to have wide application in microelectronics devices.
Koshikawa, Hiroshi; Maekawa, Yasunari; Usui, Hiroaki*
Radiation Physics and Chemistry, 77(4), p.453 - 455, 2008/04
Times Cited Count：3 Percentile：22.25(Chemistry, Physical)Composite films of poly(ethylene terephthalate) (PET) embedded with Cu nanowires were prepared by electroplating ion-track PET membranes. PET films were irradiated with 450MeV 
Xe
ions with a direction of 45 from the film normal, and then etched with sodium hydroxide solution to form thin pores of 1 
m diameter. Cu was filled into the pores by electroplating in a copper sulfate solution to form Cu nanowires embedded in a direction tilted from the film normal. The composite membrane showed anisotropic infrared absorption in the in-plane direction, having the transmission axis in the direction normal to the ion incidence.
Tamada, Masao; Koshikawa, Hiroshi; Suwa, Takeshi; Yoshioka, Terufumi*; Usui, Hiroaki*; Sato, H.*
Polymer, 41(15), p.5661 - 5667, 2000/07
Times Cited Count：18 Percentile：52.88(Polymer Science)no abstracts in English
Koshikawa, Hiroshi; Usui, Hiroaki*; Maekawa, Yasunari
no journal, ,
Hybrid membranes consisting of polyimide (PI) films embedded with copper wires were prepared by electroplating copper into the etched pores of ion track membranes. Electrical resistance of single copper wire, measured by the four-point probe, did not show significant difference with the value estimated from the bulk resistivity. It was also found that the resistance, as well as the hybrid membrane structure, remains stable against thermal treatment of at least up to 400C. Such anisotropically conducting membranes with high thermal stability are expected to have wide application in microelectronics devices.
Koshikawa, Hiroshi; Maekawa, Yasunari; Usui, Hiroaki*
no journal, ,
A 25 m-thick PET film was irradiated with Xe ions from an angle tilted by 45 from the normal direction. The film was processed with aq NaOH to open through holes by etching. The ion-track holes were filled with Cu by electroplating. Cu wires are embedded in the film after partly etching the PET by SEM. It has been confirmed that Cu nanowires as thin as 50 nm can be embedded in arbitral density and orientation. The polarized infrared transmittance of the composite film as a function of in-plane rotation angle of the polarization. It is notable that the composite membrane has uniaxial infrared anisotropy. The ion-track membrane technique can be an attractive method to form polymer-nanowire composite films that have novel functions such as optical or electronic anisotropy.
