This work was supported by the National Natural Science Foundation of China (Nos. 91323301, 21322105, and 51372025), the Research Fund for the Doctoral Program of Higher Education of China (No. 2011101120016) and Program for New Century Excellent Talents in University (No. NCET-11-0793). The authors would like to thank Prof. Chen Wang and Prof. Yanjun Guo of National Center for Nanoscience and Technology, China for AFM and SERS measure- ments and helpful discussions, respectively; Dr. Haiwei Li for help on BET tests and helpful discussions.
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supported by the National Nature Science Foundation of China (Nos. 51174028 and 51541406)
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Sponsored by the Ministerial Level Foundation(40402020105)
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Project supported by the National Natural Science Foundation of China(Grant Nos.51490675,11432009,51579145and 51379125)
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the financial supports from the National Natural Science Foundation of China (Key Program,Grant No.50634030);the Program for New Century Excellent Talents in University (Grant No.NCET-06-0285)
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