1. Research Center, Toyobo Co., Ltd. , 1-1, Katata 2-chome, Otsu , Shiga 520-0292 , Japan
2. CNT-Application Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Central 5 , 1-1-1 Higashi, Tsukuba , Ibaraki 305-8565 , Japan
3. Department of Advanced Fibro-Science , Kyoto Institute of Technology , Matsugasaki, Sakyo-ku, Kyoto-shi , Kyoto 606-8585 , Japan