Journal
NANO LETTERS
Volume 19, Issue 5, Pages 2979-2984Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b00133
Keywords
SWCNT; nanoconfinement; STEM; phase change material; SnSe
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Funding
- EPSRC [EP/I033394/1, EP/R019428/1]
- University of Warwick
- EPSRC [EP/M010643/1, EP/R019428/1] Funding Source: UKRI
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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 x 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.
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