1. Contribution from the Research Center for Advanced Carbon Materials, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan, Department of Materials Science and Engineering, Meijo University, Tenpaku-ku, Nagoya 468-8502, Japan, and Institute for Materials Chemistry and Engineering, Kyushu University, Higashi-ku, Fukuoka 812-8581, Japan