Chen, Hailong
Wen, Xiewen
Zhang, Jing
Wu, Tianmin
Gong, Yongji
Zhang, Xiang
Yuan, Jiangtan
Yi, Chongyue
Lou, Jun
Ajayan, Pulickel M.
Zhuang, Wei
Zhang, Guangyu
Zheng, Junrong
Article History
Received: 4 June 2016
Accepted: 9 July 2016
First Online: 19 August 2016
Competing interests
: The authors declare no competing financial interests.