Fig. 7
From: Isolating hydrogen in hexagonal boron nitride bubbles by a plasma treatment
Extracting hydrogen from hydrocarbon and mixture gases. a–c Schematic illustration of the separation of atomic hydrogen from ethyne (C2H2), methane (CH4) and a mixture of hydrogen and argon (Ar + H2, 5% H2) by an h-BN membrane via plasma treatment. d–f AFM height images of the h-BN surfaces treated by a typical plasma process (350 °C, 100 W, 120 min, ~3 sccm, ~3 Pa) in an environment of ethyne, methane and a mixture of hydrogen and argon. Scale bars: d 600 nm, e, f 4 μm. g–i hmax of the bubbles fabricated via the plasma treatment in C2H2, CH4 and Ar + H2 (5% of H2), respectively, and their aspect ratios as a function of the bubble diameter
