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Gold‐Catalyzed Vapor–Liquid–Solid Germanium‐Nanowire Nucleation on Porous Silicon
Author(s) -
Koto Makoto,
Marshall Ann F.,
Goldthorpe Irene A.,
McIntyre Paul C.
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200901764
Subject(s) - nucleation , materials science , nanowire , nanoporous , chemical engineering , porous silicon , epitaxy , catalysis , germanium , silicon , vapor–liquid–solid method , porosity , porous medium , nanotechnology , chemical vapor deposition , composite material , metallurgy , layer (electronics) , chemistry , organic chemistry , engineering
Nanoporous Si(111) substrates are used to study the effects of Au catalyst coarsening on the nucleation of vapor–liquid–solid‐synthesized epitaxial Ge nanowires (NWs) at temperatures less than 400 °C. Porous Si substrates, with greater effective interparticle separations for Au surface diffusion than nonporous Si, inhibit catalyst coarsening and agglomeration prior to NW nucleation. This greatly reduces the variation in wire diameter and length and increases the yield compared to nucleation on identically prepared nonporous Si substrates.