title: Synthesis, microstructure, and cathodoluminescence of [0001]-oriented GaN nanorods grown on conductive graphite substrate.
abstract: One-dimensional GaN nanorods with corrugated morphology have been synthesized on graphite substrate without the assistance of any metal catalyst through a feasible thermal evaporation process. The morphologies and microstructures of GaN nanorods were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). The results from HRTEM analysis indicate that the GaN nanorods are well-crystallized and exhibit a preferential orientation along the [0001] direction with Ga(3+)-terminated (101̅1) and N(3-)-terminated (101̅1̅) as side facets, finally leading to the corrugated morphology surface. The stabilization of the electrostatic surface energy of {101̅1} polar surface in a wurtzite-type hexagonal structure plays a key role in the formation of GaN nanorods with corrugated morphology. Room-temperature cathodoluminescence (CL) measurements show a near-band-edge emission (NBE) in the ultraviolet range and a broad deep level emission (DLE) in the visible range. The crystallography and the optical emissions of GaN nanorods are discussed.
authors.affiliation: School of Materials Science and Engineering, Dalian University of Technology , Dalian 116024, China.
authors.forename: Fang
authors.initials: F
authors.lastname: Yuan
authors.forename: Baodan
authors.initials: B
authors.lastname: Liu
authors.forename: Zaien
authors.initials: Z
authors.lastname: Wang
authors.forename: Bing
authors.initials: B
authors.lastname: Yang
authors.forename: Yao
authors.initials: Y
authors.lastname: Yin
authors.forename: Benjamin
authors.initials: B
authors.lastname: Dierre
authors.forename: Takashi
authors.initials: T
authors.lastname: Sekiguchi
authors.forename: Guifeng
authors.initials: G
authors.lastname: Zhang
authors.forename: Xin
authors.initials: X
authors.lastname: Jiang