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Growth and photoluminescence of SnO2 nanoleaves and nanopencils synthesized by Au-Ag alloying catalyst assisted carbothermal evaporation

B.Wang, G.Ouyang, I.L.Li, P.Xu

SnO2 nanoleaves and nanopencils have been synthesized on single silicon substrates using Au-Ag alloying catalyst assisted carbothermal evaporation. The products were characterized with field-emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Raman spectra, and photoluminescence spectra (PL). In comparison with SnO2 nanopencils, the new peak at 456 nm in the measured PL spectra of SnO2 nanoleaves is observed, implying that more luminescence centers exist in these nanostructures. The possible growth mechanisms are discussed for the nanoleaves and nanopencils. Based on the detailed characterization results, we can conclude that the diffusion behavior of surface atoms under different ambient conditions and the different supersaturating degree of alloying droplets would be responsible for the formation of different morphologies of SnO2 nanostructures.