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Supporting Information
Supporting Information is available from the Wiley Online Library or
from the author.
Acknowledgements
W.Q and D.D contributed equally to this work. The authors are grateful to
support from the Singapore National Research Foundation (R-279-000-323-
281), the Research Grants Council of Hong Kong (603509 and HKUST2/
CRF/10), the Temasek Defence Systems Institute of Singapore (R279-000-
305-592/422/232), the Institute of Materials Research and Engineering of
Singapore (IMRE/11-1C0213), the Innovation and Technology Commission
of Hong Kong (ITP/008/09NP), the University Grants Committee of Hong
Kong (AoE/P-03/08), an NSFC/RGC grant (N_HKUST620/11) and the
National Science Foundation of China (20974028 and 21074051).
Received: September 15, 2011
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