Fig. 1: Triple s-Bi structure in the early-stage triangular nanosheet.
From: Metastable square Bismuth allotrope oriented by six-fold symmetric mica
a Schematics of early-stage (s-Bi) and large (s-Bi/β-Bi) triangular nanosheets. b Ball-and-stick model of s-Bi from top view and side view. c TEM image of the early-stage nanosheet. Inset: Schematics of s-Bi nanosheet. d SAED pattern of the early-stage nanosheet. Each set of diffraction spots is labeled by dashed square, as s1-Bi in light green, s2-Bi in light yellow, and s3-Bi in magenta, respectively. Three s-Bi [100] crystallographic axes for s-Bi triplets are labeled. e HRTEM image of the nanosheet from box area in (c). f FFT pattern of the HRTEM image. Color dashed squares label three sets of s-Bi spots. g Overlay image of inverse FFT of three s-Bi domains. h–k Zoom-in HRTEM images from color box areas in (e). l–o Zoom-in inverse FFT overlay images from color box areas in (g). h, l Domain of s1-Bi. i, m Domain of s2-Bi. j, n Domain of s3-Bi. k, o Domain of s1-Bi+s2-Bi+s3-Bi. Square grids in (h–j) are for ease of viewing the s-Bi lattice. Scale bars in (h–o) are all 1 nm.
