Film comprising single-layer carbon nanotubes and having dense portions and sparse portions, process for producing same, and material including said film and process for producing same

Abstract

The present invention provides: a film that comprises single-layer carbon nanotubes having shapes which enable the characteristics thereof to be sufficiently exhibited; and a process for producing the film. The film, which comprises single-layer carbon nanotubes, has portions where single-layer carbon nanotubes are densely present and portions where single-layer carbon nanotubes are sparsely present, the dense portions forming a pseudo-honeycomb structure in a surface of the film.

What is claimed is: 
     
         1 . A film comprising single-walled carbon nanotubes, wherein the film has a dense portion where the single-walled nanotubes are densely present and a sparse portion where the single-walled nanotubes are sparsely present, and the dense portion forms a pseudo-honeycomb structure on the film. 
     
     
         2 . The film according to  claim 1 , wherein the film consists essentially of single-walled carbon nanotubes. 
     
     
         3 . The film according to  claim 1 , wherein an average diameter of each of the single-walled carbon nanotubes ranges from 0.7 to 3 nm. 
     
     
         4 . The film according to  claim 1 , wherein the dense portion has the single-walled carbon nanotubes, an axis direction of each of which is aligned vertically to the film, and a length of each of the vertically aligned single-walled carbon nanotubes ranges from 1 to 100 μm. 
     
     
         5 . The film according to  claim 1 , wherein the sparse portion consists essentially of the single-walled carbon nanotubes, an axis direction of each of which is disposed horizontally to the film. 
     
     
         6 . The film according to  claim 1 , wherein an average length of one side of each hexagon of the pseudo-honeycomb structure ranges from 1 to 100 μm. 
     
     
         7 . A material comprising the film according to  claim 1 . 
     
     
         8 . A solar cell comprising the film according to  claim 1 .