期刊
NANO LETTERS
卷 17, 期 2, 页码 805-810出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b04031
关键词
Single-walled carbon nanotubes; PbTe; confinement; 1D crystals; atomic structure; HRTEM
类别
资金
- Russian Science Foundation [14-13-00747]
- Russian Science Foundation [14-13-00747] Funding Source: Russian Science Foundation
The structural organization of compounds in a confined space of nanometer-scale cavities is of fundamental importance for understanding the basic principles for atomic structure design at the nanolevel. Here, we explore size-dependent structure relations between one-dimensional PbTe nanocrystals and carbon nanotube containers in the diameter range of 2.0-1.25 nm using high-resolution transmission electron microscopy and ab initio calculations. Upon decrease of the confining volume, one-dimensional crystals reveal gradual thinning, with the structure being cut from the bulk in either a < 110 > or a < 100 > growth direction until a certain limit of similar to 1.3 nm. This corresponds to the situation when a stoichiometric (uncharged) crystal does not fit into the cavity dimensions. As a result of the in-tube charge compensation, one-dimensional superstructures with nanometer-scale atomic density modulations are formed by a periodic addition of peripheral extra atoms to the main motif Structural changes in the crystallographic configuration of the composites entail the redistribution of charge density on single-walled carbon nanotube walls and the possible appearance of the electron density wave. The variation of the potential attains 0.4 eV, corresponding to charge density fluctuations of 0.14 e/atom.
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