2D Lab: Functionalize the Sheet — Without Shredding It

A generic graphene-like teaching lattice — material windows differ sharply (see the article’s table). One atom thick means nowhere to hide damage. Choose a plasma chemistry, raise the dose, and watch functional groups — then defects — appear on the lattice.

Schematic teaching model of plasma functionalization at the two-dimensional limit. The core trade-off is real — reactive species graft functional groups that raise wettability, dispersibility, and chemical handles, while excess ion bombardment knocks lattice atoms out, degrading the very electronic quality that made the sheet valuable; remote and pulsed operation extends the gentle window — but coverage fractions, defect thresholds, and the honeycomb graphic are illustrative, not calibrated to any one material. Coverage and vacancy percentages are relative scales on this generic graphene-like lattice, not calibrated values. Real windows differ sharply between graphene, h-BN, TMDs, and MXenes — MXenes in particular start already surface-terminated (see the article’s material table).