Insitu observation of morphological change in CdTe nano-and submicron wires

We report growth and characterization of CdTe wires 30-400nm in diameter by the vapor-liquid-solid technique. Individual nanowires were placed on a movable piezotube, which allowed three-dimensional motion toward a scanning tunneling microscope (STM). A bias was applied to the STM tip in contact with the nanowire, and the morphological changes due to Joule heating were observed insitu using a transmission electron microscope (TEM) in real time. For thick CdTe wires (d \u3e ∼ 150nm), the process results in the growth of superfine nanowires (SFNWs) of 2-4nm diameter on the surface of the wire. Smaller diameter nanowires, in contrast, disintegrate under the applied bias before the complete evolution of SFNWs on the surface. © 2011 IOP Publishing Ltd