Kibeom Kim, Sung-Taek Hur, Sunhwan Kim, Seong-Yong Jo, Bo Ram Lee, Myoung Hoon Song*, and Suk-Won Choi*, J. Mater. Chem. C, 2015, 3, 5383
http://pubs.rsc.org/en/Content/ArticleLanding/2015/TC/C5TC00420A#!divAbstract