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(a) Low-magnification image of a BN sheet. (b) HRTEM image of a BN sheet. The sheet is folded along the  axis, resulting in the fringe contrast (indicated by arrows) at the edge. Inset I is the diffractogram from circled area I, showing the hexagonal symmetry of the BN sheet. Inset II is the diffractogram from area II; the streaks lying perpendicular to the edge are similar to those seen in the electron diffraction of nanotubes. (c) Another BN sheet with folding axis 6.9° off the  axis. The folded sheet is rotated 13.8° with respect to the basal sheet, resulting in a Morié pattern. Insets I and II are, respectively, diffractograms from the whole image and circled area. The subscripts B and F in the index of diffractogram II represent the basal and folded BN sheet, respectively. Inset III is a simulated image based on a structural model in which a 13.8° rotated BN sheet is overlapped with another BN sheet. The simulation is in good agreement with the experimental image.
(a) BN sheet with two atomic layers. (b) BN sheet with atomic triple layers in the left-bottom side and a single layer in the right-top side. The large arrow indicates the interface between triple-layer and single-layer BN sheets.
EELS spectra of BN sheets with two, three, and four layers. The inset is the near-edge structure of the N ionization edge of the two-layer BN sheet.
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