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(a) SEM image of a circular patterned array of multiwalled carbon nanotubes. (b) The same with higher magnification. The compact disc like visible dispersion effects produced by the circular MWCNT array, when viewed from angles of (c) 10°, (d) 30°, (e) 55°, and (f) 70° with the vertical.
(a) 2D circular array of MWCNTs. (b)Cropped image of a 2D Fourier transform of the nanotube array producing a continuous diffraction pattern consisting of concentric circles and lobes. (c) SEM image of MWCNT array taken at 30° from the vertical. (d) 2D FFT of the SEM image produces a diffraction pattern with an intensity envelope dictated by the nanotube shape.
The schematic diagram of the experimental setup used to characterize the diffraction patterns.
Captured diffraction patterns produced by the circular MWCNT array. (a) The inner concentric circles surrounding the reflection spot (zero order). (b) The inner circles captured from a different angle with a longer camera exposure time. (c) An edge of the outer major circle (having higher intensity) surrounded by a mesh of lobes.
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