Funding for this research was provided by:
National Natural Science Foundation of China (21405172)
National Natural Science Foundation of China (21575159)
National Natural Science Foundation of China (21275158)
Youth Innovation Promotion Association of the Chinese Academy of Sciences (2015170)
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COPYRIGHT AND LICENSING
: The Royal Society of Chemistry has an exclusive publication licence for this journal
PEER REVIEW METHOD
: Single-blind
PUBLICATION HISTORY
: Received 23 February 2016; Accepted 9 April 2016; Accepted Manuscript published 11 April 2016; Advance Article published 26 April 2016; Version of Record published 18 July 2016