1 Light-enhanced liquid-phase exfoliation and photoswitching current in graphene-azobenzene composites Markus Döbbelin, 1 Artur Ciesielski, 1* Sébastien Haar, 1 Silvio Osella, 2 Matteo Bruna, 3 Andrea Minoia, 2 Luca Grisanti, 2 Thomas Mosciatti, 1 Fanny Richard, 1 Eko Adi Prasetyanto, 4 Luisa De Cola, 4 Vincenzo Palermo, 5 Raffaello Mazzaro, 6,7 Vittorio Morandi, 6 Roberto Lazzaroni, 2 Andrea C. Ferrari, 3 David Beljonne 2 and Paolo Samorì 1* 1 Nanochemistry Laboratory, ISIS & icFRC, Université de Strasbourg & CNRS, 8 allée Gaspard Monge, Strasbourg, France. E-mail: samori@unistra.fr, ciesielski@unistra.fr 2 Laboratory for Chemistry of Novel Materials, University of Mons, Place du Parc 20, B-7000 Mons, Belgium. 3 Cambridge Graphene Centre, University of Cambridge, 9 JJ Thomson Avenue, Cambridge CB3 OFA, UK. 4 Laboratory of Supramolecular Biomaterials and Chemistry, ISIS & icFRC, Université de Strasbourg & CNRS, 8 allée Gaspard Monge, Strasbourg, France. 5 ISOF-CNR, via Gobetti 101, 40129 Bologna, Italy. 6 IMM-CNR Sezione di Bologna, via Gobetti, 101, 40129 Bologna, Italy. 7 Dipartimento di Chimica “G. Ciamician”, Università di Bologna, via Selmi 2, 40126 Bologna, Italy.