1 Supporting Information                             ! School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 * E’mail: pslee@ntu.edu.sg Institute of Chemistry, The Hebrew University of Jerusalem Edmond J. Safra Campus, Jerusalem 9190401, Israel  . (a) XRD of MoO 3 ’II flakes (ICDD:471320), (b) SEM micrograph, (c) TEM micrograph, and inset shows HRTEM micrograph, and (d) AFM topography and inset shows height profile of the marked flake (thickness ~ 200 nm).