1. Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
2. Nanomaterials and Nanotechnology Department, Advanced Materials Division, Central Metallurgical R&D Institute (CMRDI), P.O. Box 87 Helwan, Cairo 11421, Egypt
3. Canatu, Ltd., Konalankuja 5, Helsinki FI-00390, Finland
4. Department of Applied Physics, Aalto University School of Science, 15100, Aalto FI-00076, Finland
5. Energy NanoEngineering Laboratory, National Institute of Advanced Industrial Science and Technology (AIST), 1-2-1 Namiki, Tsukuba 305-8654, Japan