Fig. 5
From: Isolating hydrogen in hexagonal boron nitride bubbles by a plasma treatment
Penetration depth of atomic hydrogen into h-BN multilayers. a Optical image of an h-BN flake on which the bubbles generated by a 400 W H-plasma treatment ruptured. h-BN flaps peeled off the adhered macroscopic films, and the multilayer h-BN sheets tore and then folded. b AFM height and c amplitude error images taken of the red area shown in (a). The bottom of the pit is atomically flat, and no bubble filled with hydrogen molecules was found. The insert in (b) is the AFM depth profile along the yellow dashed line. The deviation in the height is approximately 15.2 nm, indicating that ~23 atomic layers were ruptured and folded over the top layer of h-BN. The scale bars in (a–c) represent 1 μm. d Illustration of the ruptured depth for the folding steps depicted in (b, c) caused by the bursting of the h-BN bubble. e Depth distribution of penetration into the surface of the h-BN flake shown in (a)
