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| Home > Publications database > Nanostructuring of titania thin films by combination of micro-fluidics and block copolymer based sol-gel templating |
| Journal Article | PHPPUBDB-19406 |
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2011
Wiley-VCH Verl.
Weinheim
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Please use a persistent id in citations: doi:10.1002/smll.201001734
Abstract: Sol-gel templating of titania thin films with the amphiphilic diblock copolymer poly(dimethyl siloxane)-block-methyl methacrylate poly(ethylene oxide) is combined with microfluidic technology to control the structure formation. Due to the laminar flow conditions in the microfluidic cell, a better control of the local composition of the reactive fluid is achieved. The resulting titania films exhibit mesopores and macropores, as determined with scanning electron microscopy, X-ray reflectivity, and grazing incidence small angle X-ray scattering. The titania morphology has three features that are beneficial for application in photovoltaics: 1) a large surface-to-volume ratio important for charge generation with disordered hexagonally arranged mesopores of 25 nm size and a film porosity of up to 0.79, 2) enhanced light scattering that enables the absorption of more light, and 3) a dense titania layer with a thickness of about 6 nm at the substrate (bottom electrode) to prevent short circuits. An optical characterization complements the structural investigation.
Keyword(s): Microfluidics (MeSH) ; Microscopy, Electron, Scanning (MeSH) ; Nanostructures: chemistry (MeSH) ; Phase Transition (MeSH) ; Polymers: chemistry (MeSH) ; Porosity (MeSH) ; Surface Properties (MeSH) ; Titanium: chemistry (MeSH) ; X-Rays (MeSH) ; Polymers ; titanium dioxide ; Titanium
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