Spectroscopic investigation of different concentrations of the vapour deposited copper phthalocyanine as a “guest” in polyimide matrix

• Different concentrations of copper phthalocyanine in polyimide matrix have been investigated in nanocomposite films.
• FTIR spectroscopy has been applied for quantitative and qualitative analysis of the CuPc in PI/CuPc composites.
• The relationship between structure and spectral properties has been studied.

Nanocomposite layers 250 nm copper phthalocyanine/polyimide prepared by simultaneous vapour deposition of three different sources were studied. Different concentrations of copper phthalocyanine as a “guest” in polyimide matrix as a function of conditions of the preparation have been determined by FTIR (Fourier Transform Infrared) and UV–VIS (Ultraviolet–Visible) spectroscopies. The aim was to estimate the possibility of the spectroscopic methods for quantitative determination of the “guest” and compare with the quality of the polyimide thin films in relation to the “guest” concentration. The band at 1334 cm−1 has been used for quantitative estimation of “guest” in polyimide matrix. The concentrations of the copper phthalocyanine less than 20% require curve fitting techniques with Fourier self deconvolution. The relationship between “guest” concentrations and degree of imidization, as well as the electronic UV–VIS spectra are discussed in relation to the composition, imidization degree and the two crystallographic modification of the embedded chromophore.

FTIR spectra of the nanocomposite films of: (——) CuPc:PI = 40:60; (- - - - -) CuPc:PI = 60:40.Figure optionsDownload as PowerPoint slide