[6] We thank Cory Czarnik of Gatan Inc. for the development and installation of K2-IS camera. We also thank Profs. Hui Zhang and Jian Sha of Zhejiang University for providing Si NWs. The work reported here is supported by the NSF MRI Grant NSF DMR 12-29454 and NSF DMR 0449790. Jianbo Wu is partially supported by DOE BES under contract DEFG02-01ER45923.
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