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Growth of AlN nanowires by metal organic chemical vapour deposition
Author(s) -
Cimalla V.,
Foerster Ch.,
Cengher D.,
Tonisch K.,
Ambacher O.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200565205
Subject(s) - nanowire , kirkendall effect , materials science , chemical vapor deposition , vapor–liquid–solid method , evaporation , chemical engineering , aluminium , metal , nanotechnology , nanostructure , hexagonal crystal system , deposition (geology) , catalysis , crystallography , composite material , metallurgy , chemistry , organic chemistry , paleontology , physics , sediment , biology , engineering , thermodynamics
AlN nanowires with a diameter of 20 nm were grown stochastically by the vapour‐liquid‐solid (VLS) method. At low temperatures below 1000 °C the Kirkendall effect during the alloying of aluminium and the catalyst resulted in the formation of three‐dimensional nanostructures like lamellas and nano flowers. The high temperatures above 1000 °C, which are necessary to grow the nanowires complicate the control of their formation. Small catalyst droplets of 20 nm diameter are not stable due to their evaporation. Thus, in contrast to the classical approach to grow a single nano wire out of one droplet, we grew dense networks of nanowires inside larger 3D structures with diameters up to 5 µm. Depending on the growth temperature and the droplet geometry the nanowires inside of these networks are connected by angles of 90° (“cubic”) or 120° (“hexagonal”). (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)