Fig. 1: Ultrathin fully crystalline 2DPI membrane.
From: Cation-selective two-dimensional polyimine membranes for high-performance osmotic energy conversion
a Schematic of the selective ion diffusion process across the 2DPI membrane. b The structure of the 2DPI membrane as well as its most stable stacking mode (inclined AA stacking). c The optical microscopy image of the 2DPI membrane (scale bar: 50 µm). d AFM of the 2DPI membrane on 300 nm SiO2/Si, revealing an ultrathin thickness of about 70 nm (scale bar: 300 nm; color bar: −59.2 to 66.8 nm). e TEM images and SAED pattern of the 2DPI membrane, indicating its excellent crystallinity on the microscale (scale bar: 800 nm). f In-plane intensity profile of a 2DPI membrane. The inset shows the in-plane peaks from the 2D GIWAXS pattern.
