Wijeratne, Sithara S.
Penev, Evgeni S.
Lu, Wei
Li, Jingqiang
Duque, Amanda L.
Yakobson, Boris I.
Tour, James M.
Kiang, Ching-Hwa
Article History
Received: 29 March 2016
Accepted: 8 July 2016
First Online: 9 August 2016
Competing interests
: The authors declare no competing financial interests.