Figure 5.

Effect of drying conditions on the interlayer spacing and Hg permeability of GO films. The permeability of films dried at room temperature at 15 % relative humidity for 48 hours (left), and at approximately 70°C with zero relative humidity for 48 hours (right). The inserted X-ray diffraction (XRD) spectra show that these two drying conditions lead to interlayer spacings of 0.82 nm and 0.73 nm respectively. These GO films have an areal density of 35 mg/m² and approximately 25 layers.