Efeitos das interações inter e intramoleculares na fotofísica e morfologia de filmes finos de derivados de carbazol
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2018-01-31
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Universidade Federal de Goiás
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Photoluminescent, electroluminescent and photoconductive materials find a wide range of scientific and technological applications, therefore, the accurate photophysics properties description is indispensable. To apply carbazole derivatives as active layers in photovoltaic devices, the steady-state and time-resolved fluorescence spectroscopy of 9-vinylcarbazole (9VCz) and its respective polymer, Poly (N-vinylcarbazole) (PVCz) in solution and thin films prepared by distinct techniques were carried out in this work. Layer-by-Layer by self-assembling and by spin-coating thin films were prepared in order to compare the effects of the distinct techniques on the final photophysics. They also had their morphology characterized by distinct techniques of microscopy. The spectroscopic fluorescence showed that the ideal solutions for producing the thin films were those at concentrations of 10-4 mol L-1 and 10-5 g L-1 for molecule and polymer, respectively. Thin films of the molecule prepared by the self-assembling technique showed structured bands, however, for the polymer, we observed that the spin-coating technique resulted in a film with less aggregation and structured spectra, thus, well defined vibrational bands could be observed. In addition, it was observed that the fluorescence intensity decreases as the number of layer deposition increases in the 9VCz thin films, however, in the self-assembling tri-layer PVCz film, spectra with higher intensity were recorded. Microscopy indicates the formation of thin films; however, it is possible to observe the formation of aggregates on the surface of the thin films, which are also evidenced by steady-state fluorescence.
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CORDEIRO, D. S. Efeitos das interações inter e intramoleculares na fotofísica e morfologia de filmes finos de derivados de carbazol. 2018. 115 f. Dissertação (Mestrado em Química) - Universidade Federal de Goiás, Goiânia, 2018.