Abstract
Wurtzite gallium nitride microscale tubules were synthesized through chemical vapor deposition method. The tubules were self-assembled from nanorods without any templates. The self-assemblies were up to 100μm long and 10μm in diameter. The tubules were porous. The unique structures of the tubules caused red-shifts of Raman modes and yellow band in photoluminescence spectra. A possible growth mechanism of the porous microtubules was proposed based on experimental observations.
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