Fig. 4
From: Isolating hydrogen in hexagonal boron nitride bubbles by a plasma treatment
Swelling and deflating processes of the h-BN bubbles containing hydrogen. a An optical image of bubbles on an h-BN flake, taken under ambient condition, scale bar: 20 μm. b Topographic AFM image of a bubble pointed-out by an arrow in (a) was measured at 34 and 33 K respectively, scale bars: 3 μm. c The height profiles of line-scan at the same place (indicated by dashed lines in (b)) where the bubble remains at ~34 K and disappears at ~33 K. d Histogram of the transition temperature (Ttransition) at which bubbles collapse. The red line is a Gaussian fit to the data. The yellow line is the histogram cumulative function (right axis)
