Figure 1. (IMAGE)
Caption
(a) Schematic drawings of the sample preparation processes. (b) (i) Cryo-EM image of the Ca-Cl crystals in the ultra-thin reduced graphene oxide (rGO) membrane. (ii) Diffraction pattern of a typical crystal structure by cryo-EM in electron diffraction mode. (iii) Fourier transform of the entire bright-field image showing the same hexagonal lattice as in (ii). (c) Atomic ratio of Ca to Cl as a function of the etching time measured by XPS during etching by argon ion for a sample of the dried Ca-Cl@rGO membrane. (d) One stable structure from the molecular model I of CaCl crystal modules adsorbed on graphene sheet from theoretical computations. (e) Electrical resistivity measured by using the multimeter with two electrodes connecting with the up and down surfaces of the dried rGO and GO membranes, respectively. (f) Room-temperature ferromagnetism of the dried Ca-Cl@rGO membrane. (g) Heterojunction behavior of the dried Ca-Cl@rGO membrane. (h) Piezoelectricity-like property of the dried Ca-Cl@rGO membrane under ambient conditions.
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@Science China Press
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