title: Direct synthesis of ZnO nanowire arrays on Zn foil by a simple thermal evaporation process.
abstract: ZnO nanowire arrays were synthesized on zinc foil by a simple thermal evaporation process at relatively low temperature. Morphology and size controlled synthesis of the ZnO nanostructures was achieved by variation of the synthesis temperature, reaction time and the surface roughness of the substrate. A gas-solid and self-catalytic liquid-solid mechanism is proposed for the growth of nanowires at different temperatures. High-resolution transmission electron microscopy (HRTEM) showed that the as-grown nanowires were of single crystal hexagonal wurtzite structure, growing along the [101] direction. Photoluminescence exhibited strong UV emission at ∼382 nm and a broad green emission at ∼513 nm with 325 nm excitation. Raman spectroscopy revealed a phonon confinement effect when compared with results from bulk ZnO. The nanowire arrays also exhibited a field emission property.
authors: Department of Materials Science, Indian Association for the Cultivation of Science, Kolkata-700 032, India.
authors: Tandra
authors: T
authors: Ghoshal
authors: Subhajit
authors: S
authors: Biswas
authors: Soumitra
authors: S
authors: Kar
authors: Apurba
authors: A
authors: Dev
authors: Supriya
authors: S
authors: Chakrabarti
authors: Subhadra
authors: S
authors: Chaudhuri