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Title Συνδυαστική μελέτη της θερμοκρασιακής εξάρτησης της εκπομπής φθορισμού της Ροδαμίνης Β και νανοσωματιδίων οξειδίου του ψευδαργύρου (ZnO) σε πολυμερικό υπόστρωμα πολυδιμεθυλοσιλοξανίου (PDMS)
Author Σπανού, Αικατερίνη
Thesis advisor Άγγλος, Δημήτριος
Abstract The present thesis deals with the study of the fluorescence emission from systems composed of one or two fluorophores embedded in a polydimethylsiloxane (PDMS) matrix. The two fluorophores studied were zinc oxide (ZnO) in the form of nanoparticles and the organic dye Rhodamine B. The focus of the present study was to investigate the dependence of the fluorescence emission of the two chromophores on temperature. Initially, the chromophores were studied individually in one-component systems, ZnO/PDMS and Rhodamine B/PDMS and finally in a hybrid composite ZnO-Rhodamine B/PDMS. In the context of this study two systems were employed for recording fluorescence emission spectra, a spectrofluorimeter and a laboratory Laser Induced Fluorescence (LIF) spectrometer. In the latter, samples were optically pumped by a nanosecond-pulsed Nd: YAG laser operating at either the 2 ndexc = 532 nm) or the 3 rd harmonic (λexc = 355 nm). According to the results, both chromophores exhibited dependence of their fluorescence emission signal on the temperature. In particular, both showed a significant decrease in the fluorescence intensity, while in the case of ZnO, a shift of the maximum fluorescence emission to longer wavelengths (red shift) was observed. Finally, a qualitative and quantitative fluorescence emission study of samples that contained ZnO nanoparticles chemically modified with Rhodamine B was performed.
Language Greek
Issue date 2019-07-24
Collection   Faculty/Department--Faculty of Sciences and Engineering--Department of Chemistry--Graduate theses
  Type of Work--Graduate theses
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