Abstract
ZrO 2/SiO x core/shell nanofibers with diameter ~ 50 nm were synthesized by the thermal oxidation of ZrSi 2 substrates with gallium. The crystalline ZrO 2 cores were grown with amorphous SiO x shells. It is proposed that the growth of crystalline ZrO 2 core was guided by the prior supersaturation of Zr species in the molten gallium film, whereas the amorphous SiO x shell could be attributed to the deposition of SiO vapor on the surface of ZrO 2 core. In addition, the ZrO 2/SiO x core/shell nanofibers show a wide visible photoluminescence (PL) emission at 480 nm, which should originate from the SiO x shells.
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