1. Center of Excellence for Green Nanotechnologies, Joint Centers of Excellence Program, King Abdulaziz City for Science and Technology, Riyadh 11442, Saudi Arabia
2. Materials Measurement Science Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
3. School of Mechanical Engineering, University of Ulsan, Ulsan 44610, South Korea
4. Applied Chemicals and Materials Division, Material Measurement Laboratory, National Institute of Standards and Technology, Boulder, Colorado 80305, United States
5. Department of Electrical Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States