1. Center for Integrated Nanotechnologies, Los Alamos National Laboratory , Los Alamos, NM , USA
2. National Center for Electron Microscopy , Molecular Foundry, , Berkeley, CA , USA
3. Lawrence Berkeley National Laboratory , Molecular Foundry, , Berkeley, CA , USA
4. Materials Science and Technology Division, Los Alamos National Laboratory , Los Alamos, NM , USA
5. Center for Integrated Nanotechnologies, Sandia National Laboratories , Albuquerque, NM , USA
6. School of Materials Engineering, Purdue University , West Lafayette, IN , USA