1. Center for Advanced Materials Research, University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States
2. Department of Mechanical Engineering University of Texas at El Paso, 500 West University Avenue, El Paso, Texas 79968, United States
3. Center for Integrated Nano Technologies, Sandia National Laboratory, Albuquerque, New Mexico 87185, United States
4. Environmental Molecular Sciences Laboratory (EMSL), Pacific Northwest National Laboratory (PNNL), Richland, Washington 99352, United States
5. Department of Electrical and Computer Engineering and Petersen Institute of NanoScience and Engineering, University of Pittsburgh, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States