Author/Authors :
Meng، نويسنده , , X.Q. and Shen، نويسنده , , D.Z. and Zhang، نويسنده , , Neil J.Y. and Zhao، نويسنده , , D.X. and Lu، نويسنده , , Y.M. and Dong، نويسنده , , L. and Zhang، نويسنده , , Z.Z. and Liu، نويسنده , , Y.C. and Fan، نويسنده , , X.W.، نويسنده ,
Abstract :
High quality vertical-aligned ZnO nanorod arrays were synthesized by a simple vapor transport process on Si (111) substrate at a low temperature of 520 °C. Field-emission scanning electron microscopy (FESEM) showed the nanorods have a uniform length of about 1 μm with diameters of 40–120 nm. X-ray diffraction (XRD) analysis confirmed that the nanorods are c-axis orientated. Selected area electron diffraction (SAED) analysis demonstrated the individual nanorod is single crystal. Photoluminescence (PL) measurements were adopted to analyze the optical properties of the nanorods both a strong UV emission and a weak deep-level emission were observed. The optical properties of the samples were also tested after annealing in oxygen atmosphere under different temperatures, deep-level related emission was found disappeared at 600 °C. The dependence of the optical properties on the annealing temperatures was also discussed.
