Funding for this research was provided by:
Ministry of Science and Technology of the People's Republic of China (2016YFA0202900, 2015CB856600)
National Natural Science Foundation of China (21332009, 21361140373, 21421091)
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COPYRIGHT AND LICENSING
: The Royal Society of Chemistry has an exclusive publication licence for this journal
OPEN ACCESS: This article is freely available. This article is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported Licence (CC BY-NC 3.0)
PEER REVIEW METHOD
: Single-blind
PUBLICATION HISTORY
: Received 29 March 2017; Accepted 24 April 2017; Accepted Manuscript published 24 April 2017; Advance Article published 3 May 2017; Version of Record published 17 May 2017