Journal
NANO LETTERS
Volume 15, Issue 5, Pages 3303-3308Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b00520
Keywords
Branched nanostructure; in situ TEM; environmental TEM; heterostructure; nanobelt
Categories
Funding
- NSF [DMR-1210503]
- LRSM
- NSF MRSEC [DMR-1120901]
- National Institutes of Health through the NIH Director's New Innovator Award Program [1-DP2-7251-01]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0012704]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1210503] Funding Source: National Science Foundation
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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.
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