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Coexistence of Vapor–Liquid–Solid and Vapor–Solid–Solid Growth Modes in Pd‐Assisted InAs Nanowires
Author(s) -
Heun Stefan,
Radha Boya,
Ercolani Daniele,
Kulkarni Giridhar U.,
Rossi Francesca,
Grillo Vincenzo,
Salviati Giancarlo,
Beltram Fabio,
Sorba Lucia
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.201000811
Subject(s) - nanowire , materials science , transmission electron microscopy , vapor–liquid–solid method , nanotechnology , morphology (biology) , solid solution , electron microscope , chemical engineering , optics , metallurgy , genetics , engineering , biology , physics
During the growth of InAs nanowires from Pd catalyst particles on InAs(111)A substrates, two distinct classes of nanowires are observed with smooth or zigzagged sidewalls. It is shown that this is related to a bimodal distribution of the wire‐tip diameter: above a critical diameter wires grow with smooth sidewalls, and below with zigzagged morphology. Transmission electron microscopy analysis shows that the catalyst particles at the tip of zigzagged wires are smooth and have a higher aspect ratio than those at the tip of smooth wires. Zigzagged wires grow from liquid particles in the vapor–liquid–solid (VLS) mode whereas the smooth ones grow from solid particles in the vapor–solid–solid (VSS) mode.