Paper
RSC Advances
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Conflicts of interest
There are no conicts to declare.
Acknowledgements
26 S. Park and R. S. Ruoff, Nat. Nanotechnol., 2009, 4, 217–224.
The work was supported by the National Natural Science 27 Y. Q. Sun, C. Li, Y. X. Xu, H. Bai, Z. Y. Yao and G. Q. Shi,
Foundation of China (21401091, 21671088, and 21431002) and Chem. Commun., 2010, 46, 4740–4742.
the Fundamental Research Funds for the Central Universities 28 G. Z. Liao, S. Chen, X. Quan, H. H. Yu and H. M. Zhao, J.
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