Paco's work has been published in Carbon!

The study of the nanometer-scale vacancy defects (nanopores) in graphene by transmission electron microscopy (TEM) is severely hindered by the presence of polymeric residues originating from the graphene-transfer-step to the TEM grid. The state-of-the-art transfer strategies yield contamination-free pristine graphene specimens but do not work well for the nanoporous graphene. Herein, we present a novel strategy to fabricate a sub-100-nm-thick lacey polymer film hosting see-through windows (10–900 nm) by using a facile nonsolvent-induced phase separation (NIPS). The method results in samples with large contamination-free areas which are easy to find during aberration-corrected high-resolution TEM (AC-HRTEM) imaging, enabling high throughput structural analysis of graphene nanopores.