1. School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, E1 4NS, London, U.K.
2. Nanoforce Technology Ltd., Mile End Road, E1 4NS London, U.K.
3. School of Materials Science and Technology, China University of Geosciences, Beijing 100083, P. R. China
4. Laboratory of Bio-inspired & Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano 77, 38123 Trento, Italy
5. Center for Materials
and Microsystems, Fondazione Bruno Kessler, Via Sommarive 18, 38123 Povo, Trento Italy