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Optical characterization of plasma‐polymerized pyrrole‐ N , N ,3,5‐tetramethylaniline bilayer thin films
Author(s) -
Kamal M. M.,
Bhuiyan A. H.
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.33176
Subject(s) - bilayer , polymerization , materials science , fourier transform infrared spectroscopy , thin film , monomer , analytical chemistry (journal) , plasma polymerization , absorption spectroscopy , infrared spectroscopy , spectroscopy , polymer chemistry , chemistry , polymer , chemical engineering , nanotechnology , optics , organic chemistry , composite material , biochemistry , physics , quantum mechanics , membrane , engineering
Abstract A capacitively coupled parallel‐plate reactor has been used to deposit plasma‐polymerized pyrrole (PPPy), plasma‐polymerized N,N ,3,5‐tetramethylaniline (PPTMA), and plasma‐polymerized pyrrole‐ N,N ,3,5‐tetramethylaniline (PPPy‐PPTMA) bilayer thin films on to glass substrates at room temperature. To deposit the bilayer films, pyrrole monomer has been used as the mother material and N,N ,3,5‐tetramethylaniline monomer has been deposited in different deposition time ratios after the pyrrole films were formed. Fourier transform infrared (FTIR) and ultraviolet–visible (UV–vis) spectroscopy techniques have been used to characterize the as‐grown thin films of about 500‐nm thick. The structural analyses by FTIR spectroscopy have indicated that the monomer has undergone the reorganization and the ring structure is retained during the plasma polymerization. From the UV–vis absorption spectra, allowed direct transition ( E qd ) and allowed indirect transition ( E qi ) energy gaps were determined. The E qd for PPPy, PPTMA, and PPPy‐PPTMA bilayer films are found to be 3.30, 2.85, and 3.65 eV respectively. On the other hand, the E qi for the same series are 2.25, 1.80, and 2.35 eV, respectively. From these results, it is seen that the energy gaps of the PPPy‐PPTMA bilayer films have been increased compared with the PPPy and PPTMA films. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011