Sano, Y.
Kawayama, I.
Tabata, M.
Salek, K. A.
Murakami, H.
Wang, M.
Vajtai, R.
Ajayan, P. M.
Kono, J.
Tonouchi, M.
Article History
Received: 8 May 2014
Accepted: 22 July 2014
First Online: 13 August 2014
Competing interests
: The authors declare no competing financial interests.