[10] This work was supported in part by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the U.S. Department of Energy under Contract #DE-AC02-05CH11231,the Office of Naval Research under MURI award N00014-09-1-1066; and the Air Force Office of Scientific Research under grant #FA9950-10-1-0451. Transmission electron microscopy work was performed at the National Center for Electron Microscopy; AG acknowledges support from an NSF graduate research fellowship.
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