Zhu, Shi-Jun; Ying, Hua-Zhou; Wu, Yan; Qiu, Ni; Liu, Tao; Yang, Bo; Dong, Xiao-Wu; Hu, Yong-Zhou RSC Advances, 2015, vol. 5, # 125 p. 103172 - 103183 doi: 10.1039/c5ra12837d