Hu Xiaoyong, Zhang Yingbo, Fu Yulan, Yang Hong, Gong Qihuang
State Key Laboratory for Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, P. R. China.
Adv Mater. 2011 Oct 4;23(37):4295-300. doi: 10.1002/adma.201101350. Epub 2011 Aug 15.