Sarkar, Deblina
Xie, Xuejun
Liu, Wei
Cao, Wei
Kang, Jiahao
Gong, Yongji
Kraemer, Stephan
Ajayan, Pulickel M.
Banerjee, Kaustav
Article History
Received: 12 February 2015
Accepted: 29 July 2015
First Online: 30 September 2015
Competing interests
: The authors declare no competing financial interests.