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- W2555140544 abstract "The main objectives of this work were to study the nature of copper species formed in the nanosized zeolites using two approaches: (i) direct incorporation of Cu via one pot synthesis, and (ii) post synthesis incorporation of Cu followed by chemical reduction. A detailed study of the evolution of copper species in the LTL nanosized zeolite suspension reduced with hydrazine revealed the formation of copper nanoparticles with the dimensions limited by the size of zeolite channels and cages. However, with prolonged reduction time, the Cu NPs tend to migrate to the zeolite surface due to their high mobility in aqueous media, resulting in large copper particles, while the zeolite structure is preserved. The reduction of copper resulted in a complex system, containing different copper species: residuals of Cu2+, Cu+, CuNPs. The results of FTIR spectroscopy show the heterogeneity of Cu2+ and Cu+ cations in the Cu-LTL zeolite prepared by ion-exchange procedure. It has been proven, that the state and behavior of copper in LTL zeolite strongly depend on the method used for Cu inclusion: ion exchange or direct Cu incorporation. It became evident, that copper added to the synthesis mixture shows distinct environment and occupies different position when compared to ion exchange. It is presumably partially located in the zeolite framework or occluded in its walls and is inaccessible by adsorbed molecules. In addition, the post-synthesis modifications of the material obtained by direct synthesis cause the displacement of a significant amount of Cu to the extra-framework positions.Further, the metal containing zeolite thin films with different thickness were obtained by spin-coating approach on silicon wafers and CaF2 optical plates. The latter were after employed for detection of low concentration of CO at ambient temperature and investigation of the ultrafast optical response of the materials photo-excited in resonance with the plasmon band of the Me NPs. In summary, the present PhD thesis fully covers the all steps from the synthesis, modification, thorough characterization, and application of metal-containing nanosized zeolite crystals. The combination of unique properties of copper nanoparticles with versatility of nanozeolites give rise to the development of advanced materials which are interesting for many applications in nanoscale devices, selective chemical sensing, catalysis etc." @default.
- W2555140544 created "2016-11-30" @default.
- W2555140544 creator A5051932529 @default.
- W2555140544 date "2017-06-06" @default.
- W2555140544 modified "2023-09-27" @default.
- W2555140544 title "Properties of copper species stabilized in zeolite nanocrystals" @default.
- W2555140544 hasPublicationYear "2017" @default.
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