Patent ID: 8663745

Claim:
A method of forming a film based on a Langmuir-Blodgett method, comprising: developing a helical polyacetylene onto a liquid surface; and transferring a monolayer film of the helical polyacetylene formed on the liquid surface onto a substrate to form a film at a film-forming speed between 0.4 mm/s and 2 mm/s, wherein a compressibility P, represented by the following formula (1) at a time of the film formation, is 1×10 −2 m/mN or less: P =(1/( dH/dS ))×(1 /S ) (1) where H represents a surface pressure (mN/m) of the monolayer film of the helical polyacetylene, and S represents an area (m 2 ) of the monolayer film of the helical polyacetylene developed onto the liquid surface.