Single-crystalline Zn2SnO4
(ZTO) nanowires have been successfully synthesized using a simple thermal evaporation method
by heating Zn and Sn powders directly without catalysts under a temperature lower than
800 °C. The synthesized ZTO nanowires are ribbon-like, and have an average width of 100–200 nm
and thickness of 50 nm. These nanowires are ultra-long, up to 0.5–1 mm. Further analyses
indicate that the synthesized products are ZTO nanowires with a fairly high purity. These
nanowires are highly single crystalline in the face-centred-cubic spinel structure, and grow
along the direction. It is believed that the growth process of the nanowires follows a vapour–solid
mechanism. Photoluminescence properties of the nanowires were measured, showing two
green peaks at 529 and 544 nm and two yellow–orange emission peaks at 572 and 613 nm,
which have not been reported before, besides the known blue–green peak (485 nm).
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