Hexagonal phase boron nitride buckling nanowires were successfully synthesized even at room temperature by electron-cyclotron-resonance chemical vapor deposition technique through the upstream Ar plasma cracking of nitrogen, hydrogen and diborane mixed gases. The self-assembled nanowires exhibit peculiar sponge-like shape in the scanning electron microscope images. High resolution transmission electron microscope images demonstrate that the growth axis of nanowires is perpendicular to [0002] direction. It is believed that these hexagonal phase boron nitride nanowires are nucleated and self-assembled in the gas phase. The length of these buckling nanowires are observed to range from 100nm to 200nm. Cross-sectional transmission electron microscope images indicate that these nanowires tend to lay on the substrate. In the meantime, spherical amorphous boron nanoparticles with diameters ranging from 40nm to 150nm were also observed in the samples. Moreover, intense UV light emission peaked at 310nm (4eV) was observed while the samples illuminated by 266nm laser beam. Synchrotron radiation excitation luminescence measurements reveal sharp 201nm (6eV) absorption band dominate this strong light emission. This observation indicated that the 4eV UV luminescence seems came from the deep levels transitions and possibly corresponding to the high density dislocations exist in the buckling nanowires structures.

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