1. Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
2. Functional Nanomaterials, Institute for Materials Science, Kiel University, Kaiserstrasse 2, 24143 Kiel, Germany
3. Department of Mechanical Engineering, Amrita Vishwa Vidyapeetham, Coimbatore Campus, Coimbatore 641112, India
4. Alan G. MacDiarmid NanoTech Institute, University of Texas at Dallas, Richardson, Texas 75083, United States