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(a) Optical microscopic image of free standing GaN microbelts. (b) FESEM image of a single microbelt. Inset pictures are the nanometer-sizes surface protrusions at different magnification and tilt of the microbelts.
Contact angle measurements (a) GaN epitaxial thin film. (b) Top view of a water drop on a single belt. (c) Contact angle of the liquid drop on the single microbelt.
Image analysis of microbelt surface (a) 3D surface plot of the typical microbelt, indicating the presence of nanocavities and (b) The shape of the meniscus at the triple contact point within the sinusoidal surface.
(a) Shape of the meniscus formed in the vicinity of nanocavity at different ratios, (b) The macroscopic contact angle predicted by the Cassie–Baxter model as a function of the triple-point locations , calculated for local contact angle .
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