1. Advanced Manufacturing Institute, University of Houston, 5000 Gulf Freeway, Houston, Texas 77023, United States
2. Department of Physics, University of Houston, Houston, Texas 77204, United States
3. Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, United States
4. Department of Chemistry, Rice University, Houston, Texas 77005, United States
5. Anasys Instruments, Santa Barbara, California 93101, United States
6. Nanomaterials and Devices Laboratory, Department of Physics, University of Houston, Houston, Texas 77204, United States
7. Department of Electrical and Computer Engineering, University of Houston, Houston, Texas 77004, United States
8. Energy Safety Research Institute, Swansea University Bay Campus, Swansea SA1 8EN, U.K.