1. Department of Materials Science and Engineering, Norwegian University of Science and Technology, NTNU, 7491 Trondheim, Norway
2. College of Engineering, Swansea University, SA1 8EN Swansea, United Kingdom
3. College of Engineering, Mathematics and Physical Sciences, University of Exeter, EX4 4QL Exeter, United Kingdom
4. Department of Mechanical Engineering, University College London, Torrington Place, WC1E 7JE London, United Kingdom
5. Centre for Graphene Science, University of Exeter, EX4 4QF Exeter, United Kingdom