Slade Charlotte A, Sanchez Ana M, Sloan Jeremy
Department of Physics , University of Warwick , Coventry CV4 7AL , United Kingdom.
Nano Lett. 2019 May 8;19(5):2979-2984. doi: 10.1021/acs.nanolett.9b00133. Epub 2019 Apr 17.
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.
我们报告了通过封装在窄至中等直径的单壁碳纳米管中获得的四种前所未有的新型SnSe晶体形式的观察结果。80 kV的像差校正扫描透射电子显微镜揭示了线性、锯齿形、螺旋形（即2×1）原子链以及一种新的封装SnSe形式。这种新形式显然与从相应的单层二硫化物蚀刻出的独立MoS、MoSe和WSe极限纳米线同构，并且最近也观察到了封装的MoTe。已从环形暗场（ADF）图像获得了一个结构模型。实验成像与根据新结构形式预期的模型生成的图像模拟结果非常吻合。
