Laser-ablation growth and optical properties of wide and long single-crystal SnO2 ribbons

Wide and long ribbons of single-crystalline SnO2 have been achieved via-laser-ablation of a SnO2 target. Transmission electron microscopy (TEM) shows the as-grown SnO2 ribbons are structurally perfect and uniform,, with widths of 300-500 nm, thicknesses of 30-50 mn (width-to-thickness ratio of similar to10), and lengths ranging from several, hundreds of micrometers to the order of millimeters. X-ray diffraction (XRD) pattern and energy-dispersive X-ray spectroscopy (EDS) spectral analysis indicate that the ribbons have the phase structure and chemical composition of the rutile form of SnO2. Selected-area electron diffraction (SAED) patterns and high-resolution TEM images reveal that the ribbon's are single crystals and grow along the [100] crystal direction. Photoluminescence measurements show that the synthesized SnO2 ribbons have one strong emission band at similar to605 mn and a red-shift of similar to30 nm, as compared to standard SnO2 powder, which may be attributed to crystal defects and residual strains accommodated during the growth of the ribbons.