title: Catalyst-free synthesis of well-aligned ZnO nanowires on In0.2Ga0.8N, GaN, and Al0.25Ga0.75N substrates.
abstract: Well-aligned ZnO nanowires have been synthesized vertically on In0.2Ga0.8N, GaN, and Al0.25Ga0.75N substrates, using a catalyst-free carbon thermal-reduction vapor phase deposition method for the first time. The as-synthesized nanowires are single crystalline wurtzite structure, and have a growth direction of [0001]. Each nanowire has a smooth surface, and uniform diameter along the growth direction. The average diameter and length of these nanowires are 120-150 nm, and 3-10 )m, respectively. We suggest that the growth mechanism follow a self-catalyzing growth model. Excitonic emission peaked around 385 nm dominates the room-temperature photoluminescence spectra of these nanowires. The room-temperature photoluminescence and Raman scattering spectra show that these nanowires have good optical quality with very less structural defects.
authors.affiliation: School of Physics, Peking University, Beijing 100871, PR China.
authors.forename: W Q
authors.initials: WQ
authors.lastname: Yang
authors.forename: L
authors.initials: L
authors.lastname: Dai
authors.forename: L P
authors.initials: LP
authors.lastname: You
authors.forename: B R
authors.initials: BR
authors.lastname: Zhang
authors.forename: B
authors.initials: B
authors.lastname: Shen
authors.forename: G G
authors.initials: GG
authors.lastname: Qin
mesh_terms: D000535:Aluminum / Q000737:chemistry; D002384:Catalysis; D003460:Crystallization / Q000379:methods*; D005708:Gallium / Q000737:chemistry*; D007204:Indium / Q000737:chemistry; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties; D015034:Zinc Oxide / Q000737:chemistry*
chemical_list: D046911:Macromolecular Substances; D007204:Indium; C473348:gallium nitride; D005708:Gallium; D000535:Aluminum; D015034:Zinc Oxide