1. National Graphene Institute, University of Manchester, Manchester M13 9PL, United Kingdom
2. Department of Chemical Engineering, University of Manchester, Manchester M13 9PL, United Kingdom
3. Department of Physics, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium
4. NANOlab Center of Excellence, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
5. Electron Microscopy for Materials Science (EMAT), University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
6. Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom