Yu Zhibin, Niu Xiaofan, Liu Zhitian, Pei Qibing
Department of Materials Science and Engineering, Henry Samueli School of Engineering and Applied Science, University of California-Los Angeles, CA 90095, USA.
Adv Mater. 2011 Sep 8;23(34):3989-94. doi: 10.1002/adma.201101986. Epub 2011 Jul 28.