title: Synthesis and field emission studies of tower-like GaN nanowires.
abstract: Tower-like GaN nanowires were successfully fabricated on Au-coated Si substrates by chemical vapor deposition. The tower-like nanowire consisted of a nanowire at the center and microcrystal layers stacked one by one around the nanowire. The tower-like nanowires grew along the [0001] direction, and the exposed surfaces of the microcrystal layers are [Formula: see text] and [Formula: see text] facets. The growth mechanism of the tower-like GaN nanowires was proposed. The field emission property of tower-like GaN nanowires was tested. Due to the sharp tips, nearly vertical alignment and rough surfaces caused by the microcrystal layers, the tower-like GaN nanowires show excellent performance in field emission with a turn-on field of 2.44 V/μm which is lower than those of other GaN one-dimensional (1D) nanomaterials.
  81.15.Gh; 68.37.Lp; 68.37.Vj.
authors.affiliation: Key Laboratory of Artificial Micro-and Nanostructures Ministry of Education and School of Physics and Technology, Wuhan University, Luojia Hill, Wuhan 430072, Hubei, People's Republic of China.
authors.forename: Yihe
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Key Laboratory of Artificial Micro-and Nanostructures Ministry of Education and School of Physics and Technology, Wuhan University, Luojia Hill, Wuhan 430072, Hubei, People's Republic of China.
authors.forename: Xianquan
authors.initials: X
authors.lastname: Meng
authors.affiliation: Key Laboratory of Artificial Micro-and Nanostructures Ministry of Education and School of Physics and Technology, Wuhan University, Luojia Hill, Wuhan 430072, Hubei, People's Republic of China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Wan
authors.affiliation: Key Laboratory of Artificial Micro-and Nanostructures Ministry of Education and School of Physics and Technology, Wuhan University, Luojia Hill, Wuhan 430072, Hubei, People's Republic of China.
authors.forename: Zelong
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Key Laboratory of Artificial Micro-and Nanostructures Ministry of Education and School of Physics and Technology, Wuhan University, Luojia Hill, Wuhan 430072, Hubei, People's Republic of China.
authors.forename: Huihui
authors.initials: H
authors.lastname: Huang
authors.affiliation: Key Laboratory of Artificial Micro-and Nanostructures Ministry of Education and School of Physics and Technology, Wuhan University, Luojia Hill, Wuhan 430072, Hubei, People's Republic of China.
authors.forename: Hao
authors.initials: H
authors.lastname: Long
authors.affiliation: Key Laboratory of Artificial Micro-and Nanostructures Ministry of Education and School of Physics and Technology, Wuhan University, Luojia Hill, Wuhan 430072, Hubei, People's Republic of China.
authors.forename: Zengcai
authors.initials: Z
authors.lastname: Song
authors.affiliation: Key Laboratory of Artificial Micro-and Nanostructures Ministry of Education and School of Physics and Technology, Wuhan University, Luojia Hill, Wuhan 430072, Hubei, People's Republic of China.
authors.forename: Guojia
authors.initials: G
authors.lastname: Fang
keywords: Chemical vapor deposition; Field emission; TEM; Tower-like nanowires