Patent ID: 8425873

Claim:
A method for producing a transparent electroconductive thin film comprising: dispersing single-walled carbon nanotubes of mixed metallic single-walled carbon nanotubes (m-SWNTs) and semiconductor single-walled carbon nanotubes (s-SWNTs) in an amine solution containing an amine having a boiling point of from 20 to 400° C. as a dispersant, wherein the amine solution does not contain a nonvolatile polymer ingredient, centrifuging or filtering the resulting dispersion to concentrate m-SWNTs, thereby giving a dispersion rich in m-SWNTs, and spraying the resulting dispersion rich in m-SWNTs onto a transparent substrate with an airbrush to form a thin film having a thickness in a range of from 10 to 100 nm thereon, then processing the thin film with acid to form a thin film consisting essentially of single-walled carbon nanotubes containing metallic single-walled carbon nanotubes (m-SWNTs) and having a visible light transmittance of from 96 to 97% in a wavelength range of from 400 to 800 nm and a surface resistivity of less than 5×10 4 Ω/sq, wherein a plurality of the single-walled carbon nanotubes of the thin film are individually separated and uniformly dispersed in the film as kept in contact with each other while randomly crosslinked therein, and there are no aggregates of single-walled carbon nanotubes.