Figure 5: Spray-dried GO Fe powder for re-dissolving.
From: An iron-based green approach to 1-h production of single-layer graphene oxide
(a) Fresh GOFe LC solution of H2O with a concentration of 6 mg ml−1. (b) Macroscopic photograph of spray-dried GOFe powders with a density of 224 mg cm−3. (c,d) SEM images of GOFe powders, showing that the GOFe individual particles have a peony-like morphology. The insert of d is a peony. (e) Re-dissolved GOFe solutions of H2O and N,N-dimethylformamide with a concentration of 4 mg ml−1. (f) SEM image of re-dissolved single-layered GOFe sheets on Si/SiO2 substrate. (g) Tapping mode AFM image and height profile of re-dissolved GOFe. (h) POM images of re-dissolved GOFe aqueous LCs in a quartz tube and a planar cell between crossed polarisers at a concentration of 4 mg ml−1. Scale bars, 3 μm (c), 500 nm (d), 10 μm (f), 2 μm (g) and 5 mm (h, left), 1 μm (h, right).
