Structure and electrical properties of multilayer thin films consisting of polypeptide and metal phthalocyanines

Highly ordered polypeptide Langmur-Blodgett films were fabricated from poly(glutamic acid) derivatives. The poly(glutamic acid) derivatives formed stable monolayers at the air-water interface that could be deposited onto solid substrates. The α-helix structure of the poly(glutamic acid) derivatives was confirmed by FT-IR and CD spectrum measurements. Monolayers of tetra-tert-butylphthalocyaninatoiron were transferred onto the poly(glutamic acid) derivative LB films. Monomeric tetra-tert-butylphthalocyaninatoiron molecules existed in the multilayer thin films due to the molecular template effect of the polypeptide LB film. The electrical and optical properties of the multilayer thin films transferred tetra-tert-butylphthalocyaninatoiron or other metal phthalocyanines onto polypeptide LB films were also investigated.