1. Dipartimento di Chimica “Giacomo Ciamician”; Alma Mater Studiorum; Università di Bologna; Via F. Selmi 2 40126 Bologna Italy
2. Department of Materials Science and Engineering and the Russell Berrie Nanotechnology Institute; Technion-Israel Institute of Technology; 32000 Haifa Israel
3. Dipartimento di Fisica e Astronomia; Alma Mater Studiorum; Università di Bologna; Viale Berti Pichat 6/2 40126 Bologna Italy
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 Italy
6. School of Engineering & Materials Science; Queen Mary University of London; Mile End Road London E1 4NS UK