1Center for Micro-BioRobotics, Istituto Italiano di Tecnologia, Viale Rinaldo Piaggio 34, 56025 Pontedera, Italy
2Department of
Neuroscience and Brain Technologies, Istituto Italiano di Tecnologia, Via Morego 30, 16163 Genoa, Italy
3Center for Materials
and Microsystems, Fondazione Bruno Kessler, via Sommarive 18, 38123 Povo, Italy
4Laboratory of Bio-inspired & Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento, Via Mesiano 77, 38123 Trento, Italy
5School of Engineering & Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom