Formation mechanisms of tripod and tetrapod CdTe sub(0.67)Se sub(0.33) nanocrystals

• Published in: Crystal research and technology (1979) 2016-08, Vol.51 (8), p.498-502
• Main Authors: Liu, X H, Wang, C, Duan, X F, Wang, Y Q, Liu, G J, Diao, F Y, Yang, P, Zhang, J P
• Format: Article
• Language: English
• Subjects: Coalescing; Image transmission; Nanocrystals; Nanorods; Nuclei; Semiconductors; Transmission electron microscopy; Tripods
• ISSN: 0232-1300; 1521-4079
• DOI: 10.1002/crat.201600128

CdTe sub(0.67)Se sub(0.33) nanocrystals were synthesized using a typical organic route. Two major morphologies are observed from transmission electron microscopy (TEM) images, one being a tripod, and the other being a tripod-like with a black dot in the center of the nanocrystal. The nanocrystals have two distinct geometrical shapes, one being a tripod, and the other being a tetrapod. High-resolution TEM (HRTEM) examinations show that the tetrapod nanocrystals consist of a zinc-blende nucleus and four wurtzite arms connected through a common facet, whereas the tripod nanocrystals result from the coalescence of three zinc-blende nanorods. These results are helpful to interpret the growth process of other II-VI semiconductor NCs. Transmission electron microscopy images show that the CdTe sub(0.67)Se sub(0.33) nanocrystals have two distinct geometrical shapes, one being a tripod, and the other being a tetrapod. High-resolution TEM examinations show that the tetrapod nanocrystals consist of a zinc-blende nucleus and four wurtzite arms connected through a common facet, whereas the tripod nanocrystals result from the coalescence of three zinc-blende nanorods.