Crystal-oriented wrinkles with origami-type junctions in few-layer hexagonal boron nitride

Large-area growth of multi-layer hexagonal boron nitride on polished cobalt foils by plasma-assisted molecular beam epitaxy

“…Wrinkles are also evident on the surface, which represent the conformal growth of the film across very rough Co surface with ridges and valleys. In other words, these winkles are not induced by thermal strain effect as often observed from those films produced by fast substrate cooling 37 because we used very low cooling rate, the stress originated by different thermal expansion coefficients between the film and substrate can be readily relaxed without causing the formation of wrinkles. This is further proved for the films on polished samples where no wrinkles are observed.…”

Enhanced nonlinear optical response of graphene-based nanoflake van der Waals heterostructures

“…In such a heterostructure, the interlayer interaction leads to the inequivalent carbon sublattices that, in turn, results in a non-centrosymmetric conguration. [14][15][16] The NLO properties of the h-BN monolayer, which is an isoelectronic system with graphene, but an insulator with a large bandgap of z6 eV in contrasts to the gapless graphene, has been the subject of several recent theoretical [17][18][19] and experimental [20][21][22][23][24][25] investigations. A pristine h-BN sheet exhibits NLO properties.…”

Syngas molecules as probes for defects in 2D hexagonal boron nitride: their adsorption and vibrations

“…Taking cues from prior studies on MoS 2 , [12][13][14][15][16][17] proposals have been made to activate the basal plane on h-BN by the creation of defects, 18,19 deposition of metal atoms or molecules, [20][21][22][23] creation of grain-boundaries, 24 and application of strain to the defective surface. 25 Quite akin to defect-laden single-layer MoS 2 (with sulfur vacancies), which calculations predict to be a possible catalyst for hydrogenation of syngas to alcohol, 12 the basal plane of the single-layer h-BN can be chemically activated for similar reaction, in the presence of point or line defects on the surface. Indeed, in the above mentioned experimental and theoretical study 6 showing propane hydrogenation, the activity was traced to the presence of defects.…”