title: Graphitic platform for self-catalysed InAs nanowires growth by molecular beam epitaxy.
abstract: We report the self-catalysed growth of InAs nanowires (NWs) on graphite thin films using molecular beam epitaxy via a droplet-assisted technique. Through optimising metal droplets, we obtained vertically aligned InAs NWs with highly uniform diameter along their entire length. In comparison with conventional InAs NWs grown on Si (111), the graphite surface led to significant effects on the NWs geometry grown on it, i.e. larger diameter, shorter length with lower number density, which were ascribed to the absence of dangling bonds on the graphite surface. The axial growth rate of the NWs has a strong dependence on growth time, which increases quickly in the beginning then slows down after the NWs reach a length of approximately 0.8 μm. This is attributed to the combined axial growth contributions from the surface impingement and sidewall impingement together with the desorption of adatoms during the diffusion. The growth of InAs NWs on graphite was proposed following a vapour-solid mechanism. High-resolution transmission electron microscopy reveals that the NW has a mixture of pure zinc-blende and wurtzite insertions.
authors.affiliation: Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
authors.forename: Qian D
authors.initials: QD
authors.lastname: Zhuang
authors.affiliation: Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
authors.forename: Ezekiel A
authors.initials: EA
authors.lastname: Anyebe
authors.affiliation: Department of Physics, University of Warwick, Coventry CV4 7AL, UK.
authors.forename: Ana M
authors.initials: AM
authors.lastname: Sanchez
authors.affiliation: Stephenson Institute for Renewable Energy and Department of Physics, University of Liverpool, Liverpool L69 7ZF, UK.
authors.forename: Mohana K
authors.initials: MK
authors.lastname: Rajpalke
authors.affiliation: Stephenson Institute for Renewable Energy and Department of Physics, University of Liverpool, Liverpool L69 7ZF, UK.
authors.forename: Tim D
authors.initials: TD
authors.lastname: Veal
authors.affiliation: Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK.
authors.forename: Alexander
authors.initials: A
authors.lastname: Zhukov
authors.affiliation: Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Robinson
authors.affiliation: Oxford Instruments, Tubney Woods, Abingdon OX13 5QX, UK.
authors.forename: Frazer
authors.initials: F
authors.lastname: Anderson
authors.affiliation: Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
authors.forename: Oleg
authors.initials: O
authors.lastname: Kolosov
authors.affiliation: Physics Department, Lancaster University, Lancaster LA1 4YB, UK.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Fal'ko
keywords: Graphite; Molecular beam epitaxy; Nanowires