Funding for this research was provided by:
National Natural Science Foundation of China (21175079, 21375074, 21390410)
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COPYRIGHT AND LICENSING
: The Royal Society of Chemistry has an exclusive publication licence for this journal
OPEN ACCESS: The accepted version of this article will be made freely available after a 12 month embargo period
PEER REVIEW METHOD
: Single-blind
PUBLICATION HISTORY
: Received 12 March 2015; Accepted 8 May 2015; Accepted Manuscript published 8 May 2015; Advance Article published 26 May 2015; Version of Record published 11 June 2015