1. Department of Materials Science Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS) University of Tsukuba 1‐1‐1 Tennodai Tsukuba Ibaraki 305–8573 Japan
2. Textile Engineering Politeknik STTT Bandung Jakarta Street 31 Bandung 40272 Indonesia
3. Department of Chemistry Rikkyo University 3‐34‐1 Nishi‐Ikebukuro Toshima Tokyo 171–8501 Japan