Hyeon-Cheol Jeong, Khoa Van Le, Min-Jun Gim, Sung-Taek Hur, Suk-Won Choi, Fumito Araoka, Ken Ishikawa, Hideo Takezoe*, J. Mater. Chem., 2012, 22, 4627 - 4630.
http://pubs.rsc.org/en/content/articlepdf/2012/jm/c2jm16650j