Nanostructured hybrid organic/inorganic materials by the nanobuilding blocks (NBB) approach

Tagliazucca, Valeria (2010) Nanostructured hybrid organic/inorganic materials by the nanobuilding blocks (NBB) approach. PhD thesis, University of Trento.

PDF (O/I hybrids via NBB approach) - Doctoral Thesis


The thesis work aimed to find appropriate syntheses procedures for the preparation of Nano Building Blocks (NBB) and Nano Particles (NP), starting from organo silanes as molecular precursors, using the Sol-Gel method. NBB were obtained by either non-hydrolytic or in situ water production (ISWP) route, depending on the reactive function’s loading. The obtained NBB were characterised by means of FT-IR, ATR/FT-IR, RAMAN, multinuclear NMR spectroscopies, SEM, N2 physisorption, Thermal analyses (TG/DTA), DSC. NBBs were used to prepare methacrylate-based matrices, which were subsequently exploited in order to produce patternable films by the two photon polymerisation technique (TPP). Epoxy-based matrices were also prepared and the films obtained were patterned by the UV photolithography technique. Both techniques gave high surface resolution patterning. NP were obtained with a modified Stöber method and organosilica NP were obtained. The NP were characterised by FT-IR and NMR spectroscopies. Morphology was observed and sizes calculated using SEM; N2- physisorption and thermal analyses (TG/DTA) were also carried out in order to complete the characterization. DSC measurements were performed on methacryloxypropyl-functionalised NP in order to control the ability to polymerise of the particles. Films of the different organic-modified NP were obtained by spin coating and contact angle measurements were performed. FE-SEM was used in order to observe an eventual change in morphology after thermal treatment under reduced atmosphere. The ability to retain the shape depends on the functional group on the NP. Finally a preliminary study on dye doping was accomplished. The NP were efficiently doped with a fluorescent dye: Rhodamine 6G (R6G). Absorption and emission spectra were recorded with a spectrofluorometer. It is observable that the emission spectra is influenced by the NP’s matrix.

Item Type:Doctoral Thesis (PhD)
Doctoral School:Materials Engineering (till the a.y. 2009-10, 25th cycle)
PhD Cycle:XXII
Subjects:Area 03 - Scienze chimiche > CHIM/07 FONDAMENTI CHIMICI DELLE TECNOLOGIE
Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 SCIENZA E TECNOLOGIA DEI MATERIALI
Uncontrolled Keywords:Sol-Gel, Hybrid materials, O/I hybrids, nanoparticles, Nano Building Blocks (NBBs), patterning, protective coating
Repository Staff approval on:15 Apr 2010 10:02

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