|
|
Surface-modified Luminescence, Surface-enhanced Raman Scattering and Plasmon Catalysed Reactivity of Ru(II) Dicarboxybipyridine Complexes Chemisorbed on Ag Nanoparticles
Žůrková, Markéta ; Vlčková, Blanka (advisor) ; Němec, Ivan (referee) ; Michl, Martin (referee)
[Ru(bpy)3]2+ (bpy = 2,2'-bipyridine) and its dicarboxybipyridine derivatives, namely [Ru(bpy)2(dcbpy)]2+ (dcbpy = 4,4'-dicarboxy-2,2'-bipyridine) and [Ru(dcbpy)3]2+ , were employed as model molecular ions for investigation of the mechanism of surface-modified luminiscence, of light-induced surface reactivity of adsorbates in systems with Ag nanoparticles (NPs), and as prospective photoexcited reductants of Ag+ ions capable of in- situ generation of Ag NPs. The steady state and the nanosecond time resolved luminescence (namely, 3 MLCT phosphorescence) of the [Ru(bpy)2(dcbpy)]2+ chemisorbed onto the non-aggregated Ag NPs has been investigated and compared to those of the electrostatically bonded [Ru(bpy)3]2+ . The intensity decrease of the emission and the excitation spectra observed for both complexes upon their attachment to Ag NPs has been attributed to the overlap of the excitation spectra with the surface plasmon extinction (SPE) of Ag NPs. This overlap enabled energy transfer from 3 MLCT excited state of the complexes to the excited surface plasmon state of Ag NPs. Additionally, it was proved that the chemisorption of the complexes manifests itself by at least one order of magnitude shorter 3 MLCT excited state lifetime than the electrostatic interaction. Furthermore, by the newly developed...
|
|
|
Motifs of nature in Gabriela Mistral's works
Žůrková, Markéta ; Poláková, Dora (advisor) ; Sánchez Fernández, Juan Antonio (referee)
The bachelor's thesis deals with the topic of nature in the works of Chilean poet, a laureate of Nobel Prize in Literature, Gabriela Mistral. The first chapter briefly introduces the poet and her life. The next chapter depicts the period of modernism and post-modernism in Latin America, which Gabriela Mistral is associated with, followed by an overview of all of her poetry collections to provide an outline of her work. After that comes a selection of poems, which are categorized on the basis of the particular motifs of nature that appear in them. The aim of this work is to give an image of nature in Gabriela Mistral's poems and describe her relationship with it by interpreting several selected poems and taking into consideration the author's life as well as the period and environment. The work is based on the complete edition of Mistral's original works, the Czech edition of some poems, biographies, and theoretical studies on Literature and nature.
|
|
| |
|
| |
guest ::
RSS feed.