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

One-dimensional (1D) nanowires, two-dimensional (2D) nanodendrites, and three-dimensional (3D) nanochains of SnO2 have been grown on single silicon substrates by Au-Ag alloying catalyst assisted carbothermal evaporation of SnO2 powders. One-dimensional twinning crystalline nanowires, 2D nanodendrites with spidery structure, and 3D nanochains with zigzag structure were reported. Three new peaks at 370, 470, and 555 nm in the measured photoluminescence spectra were observed, implying that more luminescence centers exist in SnO2 nanostructures due to nanocrystals and defects. The growth of the SnO2 nanostructure was discussed on the basis of the vapor-liquid-solid (VLS) mechanism.