Growth mechanism and photoluminescence of the SnO2 nanotwists on thin film and the SnO2 short nanowires on nanorods
Wang Bing(王冰)† and Xu Ping(徐平)
Shenzhen Key Lab of Micro-nano Photonic Information Technology, School of Electronic Science and Technology, Shenzhen University, Shenzhen 518060, China
Abstract SnO2 nanotwists on thin film and SnO2 short nanowires on nanorods have been grown on single silicon substrates by using Au--Ag alloying catalyst assisted carbothermal evaporation of SnO2 and active carbon powders. The morphology and the structure of the prepared nanostructures are determined on the basis of field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), selected area electronic diffraction (SAED), high-resolution transmission electron microscopy (HRTEM), x-ray diffraction (XRD), Raman and photoluminescence (PL) spectra analysis. The new peaks at 356, 450, and 489 nm in the measured PL spectra of two kinds of SnO2 nanostructures are observed, implying that more luminescence centres exist in these SnO2 nanostructures due to nanocrystals and defects. The growth mechanism of these nanostructures belongs to the vapour--liquid--solid (VLS) mechanism.
Received: 16 June 2008
Revised: 19 August 2008
Accepted manuscript online:
PACS:
81.16.-c
(Methods of micro- and nanofabrication and processing)
Fund: Project supported by the Fund of
Shenzhen Key Lab of Micro-nano Photonic Information Technology,
China (Grant No 2000811), the National Natural Science Foundation of
China (Grant No 10704050) and Fok Ying Tung Educational Foundation (Grant No 114009).
Cite this article:
Wang Bing(王冰) and Xu Ping(徐平) Growth mechanism and photoluminescence of the SnO2 nanotwists on thin film and the SnO2 short nanowires on nanorods 2009 Chin. Phys. B 18 324
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