Fabrication triangular porous

The experimental set-up and technique to fabricate columnar porous SiC are similar to the set-up used for triangular porous SiC. But, since we need to apply a high voltage (>10 V) and use a relatively concentrated HF electrolyte, the PECE experiments are conducted in a two-electrode cell where a SiC crystal is used as the anode. Aqueous 10% HF mixed with 5 % ethanol (measured by weight) electrolyte is used. Voltage is applied... 

Last, but by no means least, reference should be made to the use of proteins in nano-fabrication [492]. One approach is illustrated by the fabrication of a 1-nm-thick metal film with 15-nm-diameters holes, periodically arranged on a triangular protein lattice [493]. Advantage was taken of the 10-nm-thick, uniformly porous surface (or S) layer of the crystalline protein obtained from the thermophilic bacterium Sulfolobus acidocaldarius. The protein was adsorbed from a dilute solution onto a molecularly smooth carbon-film surface, metal coated by evaporation, and ion milled to give spatial ordering of holes with the same nanometer periodicity as the protein lattice [493]. 

In summary, we have succeeded in fabricating porous 6H- and 4H-SiC with various morphologies, among which we have most intensively studied the triangular and the columnar porous morphologies. 

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