In contrast, for PTI-IF, a major fraction of 34% of CBED patterns is collected from crystals oriented along the 001 zone axis (Figure ). This means that PTI-IF crystals are oriented with the covalently-bonded basal plane in parallel to the carbon support. The pronounced change in preferred crystal orientations is caused by the removal of ions and the accompanying reduction of cohesive, inter-planar interactionsfrom a mix of ionic and van der Waals interactions in PTI-LiBr to van der Waals interactions only in PTI-IF. As a result, PTI-sheets become more easily exfoliated and effectively diminish the stacking height of PTI-IF nano-crystals. The reorientation of PTI-IF nano-crystals with the covalent, delocalized planes parallel to a substrate and with pore channels orthogonal to it, is beneficial in device geometries intended for sensing and gating (Figure ).