Park et al. Nanoscale Research Letters 2012, 7:351 http://www.nanoscalereslett.com/content/7/1/351 Acknowledgments This work was supported by a grant from the National Research Foundation (NRF) funded by the Korea government (MEST) (No. 2011–0029811), a grant from the Global Frontier R&D Program at the Center for Multiscale Energy System funded by the National Research Foundation (No. 2011–0031562) and by a Global Ph. D. Fellowship funded by NRF (No. 2011–0007507). Author details 1Department of Chemistry, Hanyang University, Seoul 133-791, Korea. 2Department of BioNano Technology, Gachon BioNano Research Insititute, Gachon University, Gyeonggi 461-701, Korea. Authors' contributions MMS conceived and designed the experiment. KSP and JMD performed the experiment and analyzed the data. SMS contributed to materials and analysis. KSP and MMS co-wrote the paper. All authors read and approved the final manuscript. 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