*
Corresponding authors
a
Institute of Carbon Science and Technology, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
E-mail:
zp_wang@shinshu-u.ac.jp
Tel: +81-26-2695670
b
Department of Electrical and Electronic Engineering, Shinshu University, 4-17-1 Wakasato, Nagano 380-8553, Japan
c
Department of Chemical Science and Technology, Faculty of Bioscience and Applied Chemical, Graduate School of Engineering, Hosei University, 3-7-2, Kajino-cho, Koganei, Tokyo 184-8584, Japan
d
Research Center for Micro-Nano Technology, Hosei University, 3-11-15, Midori-cho, Koganei, Tokyo 184-0003, Japan
e
Department of Frontier Materials, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan
f
Department of Materials, Faculty of Mechanical Engineering, Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
g
Department of Physics, Department of Materials Science and Engineering, Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA