This work was financially supported by the National Key Research and Development Program of China (contract 2016YFB0100201), the National Natural Science Foundation of China (contracts 21571135 and 51671003), the Ministry of Science and Technology (contract 2016YFA0204100), start-up funding from Soochow University and Peking University, and the Young Thousand Talented Program and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). Part of electron microscopy work was performed at the Center for Functional Nanomaterials, Brookhaven National Laboratory, which is supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, under contract DE-SC0012704. The work at California State University Northridge was supported by the U.S. Army Research Office via the Multidisciplinary University Research Initiative grant W911NF-11-1-0353.
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