T. A. Zidan, L. M. El-Khlawany, E. M. El-Menyawy
Jun 3, 2021
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Journal
Journal of Molecular Structure
Abstract
Abstract N,N-dimethylquinacridone (DMQA) is chemically synthesized by the alkylation of quinacridone, and its molecular structure is supported with spectral techniques. DMQA with different thickness values of 34, 49, 77 and 105 nm are prepared by using vacuum evaporation. Fourier transforms infrared spectroscopy confirms the stability of the compound as a result of thermal deposition under high vacuum. DMQA powder is found to have polycrystalline structure, whereas the films exhibit preferred orientation of growth. The surface characteristics are studied in the light of collected field emission scanning electron microscope and atomic force microscope. The optical properties of DMQA as a function of film thickness are studied spectrophotometrically over the spectral range 200-2500 nm. The optical functions namely; absorption coefficient and refractive index are deduced from the measured transmittance and reflectance spectra. DMQA have mainly two absorbing bands one of them in the ultraviolet region and the other lies in the visible light region, the intensity of these bands increases with increasing film thickness. The optical band gaps and the optical dispersion parameters of the films are determined.