Patent ID: 8377323
Filing Date: 2013-02-19
Classification: B81C,B82Y,G03F,H01L

Abstract:
1. A method for making a mold for forming an array of carbon nanotubes comprising: providing a substrate having an upper surface, with the substrate comprising a SOI wafer comprising an upper silicon layer and a lower oxide layer, with the upper surface being an upper surface of the upper silicon layer; thermally growing, on the upper surface, a first layer of thermal oxide; forming, on the first layer of thermal oxide, a layer of photosensitive material; forming, on the layer of photosensitive material, a pattern through lithography patterning; developing the layer of photosensitive material and etching the first thermal oxide layer to obtain a thermal oxide mask with a geometry corresponding to the pattern; selectively etching the upper surface of the substrate to obtain, beneath the mask, a first plurality of projections having sloping side walls; etching the first plurality of projections having sloping side walls using plasma etching; thermally growing, on the upper surface, a second oxide layer to further etch the first plurality of projections having sloping side walls; selectively removing said second thermal oxide layer and said mask thus freeing said upper surface of said substrate obtaining a first plurality of projections thereon, each having an end with a pointed profile; selectively etching the lower oxide layer; forming a third layer comprising silicon on the selectively etched lower oxide layer; and coupling the upper silicon layer comprising the first plurality of projections to a metallized surface of a layer of a polymer supported by the third layer.