title: Effects of precursor concentrations and thermal annealing on ZnO nanorods grown by hydrothermal method.
abstract: ZnO nanorods were grown on spin-coated ZnO seed layers by hydrothermal method. The ZnO nanorods were grown with various precursor concentrations ranging from 0.01 to 0.3 M. Field-emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and photoluminescence (PL) were carried out to investigate the structural and optical properties of the ZnO nanorods. The average diameter and length of the ZnO nanorods is increased as the precursor concentration increased from 0.01 to 0.3 M. From XRD, the intensity of ZnO (002) peak is increased and full width at half maximum (FWHM) of ZnO (002) decreased as the precursor concentration increased. The FWHM of near-band-edge emission (NBE) decreased and intensity ratio of the NBE to the deep-level emission (DLE) increased as the precursor concentration increased which indicated the optical property is improved. The DLE is red-shifted from yellow- to red-emission and its intensity is increased as the annealing temperature increased due to thermal diffusion process.
authors: Department of Nano Systems Engineering, Center for Nano Manufacturing, Inje University Gimhae 621-749, Korea.
authors: Min Young
authors: MY
authors: Cho
authors: Min Su
authors: MS
authors: Kim
authors: Kwang Gug
authors: KG
authors: Yim
authors: Dong-Yul
authors: DY
authors: Lee
authors: Jong Su
authors: JS
authors: Kim
authors: Jin Soo
authors: JS
authors: Kim
authors: Jae-Young
authors: JY
authors: Leem