1. Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, NY 11973, USA.
2. Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, USA.
3. Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794, USA.
4. Department of Chemical Engineering, Columbia University, 817 SW Mudd, New York, NY 10027, USA.
5. National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY 11973, USA.