| 摘要 |
A catalyst material is deposited over a deposition area, the catalyst material being patterned within the deposition area to form an array of catalyst regions (12) which are spaced apart by gaps substantially free of catalyst material (13). A proportion of the deposition area occupied by the catalyst regions (12) is greater than a proportion of the deposition area which is substantially free of catalyst material (13). A first array of bundles of filaments is grown on the catalyst regions (12). Each filament has a base attached (14) to the catalyst region (12) and a free tip (15). The free tips (15) of the filaments are drawn together within each bundle, so that the inter- filament gaps become smaller at the tip (15) of each bundle than at the base (14) of each bundle where the filaments remain attached to the catalyst region (12). These steps are repeated to provide a second array of bundles of filaments positioned or grown at least partly in the inter-bundle gaps of the first array. Gaps of both arrays are impregnated with a matrix material (33) to form an improved composite material. |
