Patent ID: 8349404
Filing Date: 2013-01-08
Classification: B01J,B82Y,C01B,C23C,D01F,Y10T

Abstract:
1. A method of forming a bi-layer composition of carbon nanotubes, comprising: providing a flat substrate applying a catalytic precursor solution to the flat substrate, wherein said catalytic precursor solution comprises a surface wetting agent selected from the group consisting of silicates, silanes and organosilanes; drying the catalytic precursor solution thereby forming a catalytic composition on said substrate; exposing the substrate carrying said catalytic composition to a heated carbon-containing gas or gasified liquid causing production of carbon nanotubes; wherein said step of exposing said catalytic composition to a heated carbon-containing gas initially grows a randomly oriented layer of carbon nanotubes on said substrate and subsequently grows a vertically-oriented layer of carbon nanotubes between said flat substrate and said randomly oriented horizontal layer of carbon nanotubes.