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(a) BF micrograph showing the interconnected macroporous structure. (b) A Wiener-filtered HRTEM micrograph together with the corresponding diffractogram demonstrating the 9R polytype structure. A schematic of the 9R silicon-double-layer stacking sequence is shown in the inset.
(a) A schematic illustration for the formation of the Si 3D structure. MgO is displayed as blue (dark) spheres and polyhedra. (b) A BF micrograph and (c) an elemental mapping of the same region as presented in (b) using the characteristic volume-plasmon energy losses of MgO and Si.
A simulated map of the energy loss vs electron momentum of a diamond-structured Si specimen with a thickness of 30 nm at an incident electron energy of 200 keV. The Čerenkov losses associated with the surface modes occur mainly at a momentum transfer range below .
(a) A 9R Si diffraction pattern in  orientation showing the two positions (dotted circles) at which DF VEELS spectra in (c) were recorded. Yellow (bright) circles indicate the regions within which spectral artifacts are likely to occur. (b) A diffraction pattern of diamond-structured Si in  orientation showing the two positions (dotted circles) at which DF VEELS spectra were recorded. (c) Spectra of 9R polytype Si (from positions 9R-Si-1 and 9R-Si-2) and diamond-structured Si (from positions Si-1 and Si-2) obtained by DF VEELS.
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