1. Department of Mechanical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
2. Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
3. Center for Integrated Nanotechnologies, Albuquerque, New Mexico 87185, United States
4. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
5. Electronic Materials and Devices Department, Applied Research Laboratory, University Park, University Park, Pennsylvania 16802, United States
6. Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States