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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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