1. Nanoscale Sciences Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
2. Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
3. Geochemistry Department, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
4. Material, Physical, and Chemical Sciences Center, Sandia National Laboratories, Albuquerque, New Mexico 87185, United States