Unprecedented New Crystalline Forms of SnSe in Narrow to Medium Diameter Carbon Nanotubes.
basic_science · Level V
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- Record sourced from PubMed, PMID 30973739.
- Also identified by DOI 10.1021/acs.nanolett.9b00133.
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Abstract
We report the observation of four unprecedented new crystalline forms of SnSe, obtained as a result of encapsulation in narrow to medium diameter single-walled carbon nanotubes. Aberration-corrected scanning transmission electron microscopy at 80 kV revealed linear, zigzag, helical (i.e., 2 × 1) atomic chains and a new form of encapsulated SnSe. This new form is apparently isostructural to free-standing MoS, MoSe, and WSe extreme nanowires etched from the corresponding monolayer dichalcogenides and also recently observed encapsulated MoTe. A structural model has been attained from annular dark-field (ADF) images. The experimental imaging agrees well with image simulations produced from models anticipated for the new structural forms.