Transmission electron microscope (TEM) images of free standing GaAs
nanowires(NWs). (a) single NW. (b) and (c) High-magnification images
(d) HRTEM image near the NW side. (e) images for Au particles with
different diameters.
Photoluminescence spectra for GaAs
NWs grown using Au particles with
three nominal diameters.


Freestanding GaAs Nanowires with the Controlled Diameter and Their Optical Properties with the Radial Quantum-confinement Effect

Semiconductor nanowires (NWs) have attracted considerable attention due to the interesting fundamental properties of such low-dimensional systems. With a view to exploring the potentially unique applications of the freestanding-type nanowires, we synthesized freestanding GaAs NWs with a controlled diameter using size-selective Au particles via the Au-catalyzed vapor-liquid-solid method, and successfully observed the luminescence blue shift induced by the radial quantum-confinement effect. Our work opens the way to investigating size-related optical phenomena in bare GaAs quantum wires, and provides more opportunities for the study of one-dimensional quantum physics using freestanding NWs. (Page 39)

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