†Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States.
‡Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States.
Nano Lett. 2015 May 13;15(5):3303-8. doi: 10.1021/acs.nanolett.5b00520. Epub 2015 May 4.
It has been observed that wurtzite II-VI semiconducting nanobelts transform into single-crystal, periodically branched nanostructures upon heating. The mechanism of this novel transformation has been elucidated by heating II-VI nanobelts in an environmental transmission electron microscope (ETEM) in oxidizing, reducing, and inert atmospheres while observing their structural changes with high spatial resolution. The interplay of surface reconstruction of high-energy surfaces of the wurtzite phase and environment-dependent anisotropic chemical etching of certain crystal surfaces in the branching mechanism of nanobelts has been observed. Understanding of structural and chemical transformations of materials via in situ microscopy techniques and their role in designing new nanostructured materials is discussed.
已经观察到纤锌矿 II-VI 半导体纳米带在加热时会转变为单晶、周期性分支的纳米结构。通过在环境透射电子显微镜 (ETEM) 中加热 II-VI 纳米带，并在氧化、还原和惰性气氛中观察它们的结构变化，同时以高空间分辨率进行观察，阐明了这种新颖转变的机制。在纳米带的分支机制中，观察到了纤锌矿相高能表面的表面重构与特定晶面的环境依赖性各向异性化学腐蚀之间的相互作用。通过原位显微镜技术理解材料的结构和化学转变及其在设计新型纳米结构材料中的作用也进行了讨论。
