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

机译:CdTe纳米和亚微米线的形态变化的原位观察

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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 > ~ 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.
机译:我们通过汽-液-固技术报告了直径为30-400nm的CdTe线的生长和表征。将各个纳米线放置在可移动的压电管上,该压电管允许向扫描隧道显微镜(STM)进行三维运动。向与纳米线接触的STM尖端施加偏压,并使用透射电子显微镜(TEM)实时观察到因焦耳热引起的形态变化。对于较厚的CdTe导线(d>〜150nm),该过程导致在导线表面上生长直径为2-4nm的超细纳米线(SFNW)。相反,直径较小的纳米线在表面上SFNW完全演化之前,在施加的偏压下会崩解。

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