1. Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794, United States
2. Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
3. Center for Functional Nanomaterials, Electron Microscopy Group, Brookhaven National Laboratory, Upton, New York 11973, United States
4. U.S. Army Combat Capabilities Development Command Chemical Biological Center, Aberdeen Proving Ground, Maryland 21010, United States