Matches in SemOpenAlex for { <https://semopenalex.org/work/W117095909> ?p ?o ?g. }
Showing items 1 to 79 of
79
with 100 items per page.
- W117095909 abstract "This thesis describes studies of materials which can be exploited for hydrogen production from water and sunlight. The materials investigated are maghemite (γ-Fe2O3), magnetite (Fe3O4) and especially hematite (α-Fe2O3), which is an iron oxide with most promising properties in this field. Hematite has been deposited using Atomic Layer Deposition (ALD) - a thin-film technique facilitating layer-by-layer growth with excellent thickness control and step coverage. The iron oxides were deposited using bis-cyclopentadienyl iron (Fe(Cp)2) or iron pentacarbonyl (Fe(CO)5) in combination with an O2 precursor. Since it is crucial to have good control of the deposition process, the influence of substrate, process temperature, precursor and carrier gas have been investigated systematically. By careful control of these deposition parameters, three polymorphs of iron oxide could be deposited: hematite (α-Fe2O3), maghemite (γ-Fe2O3) and magnetite (Fe3O4).The deposited materials were characterized using X-ray Diffraction, Raman and UV-VIS Spectroscopy, and Scanning Electron Microscopy. Hard X-ray Photoelectron Spectroscopy (HAXPES) was also used, since it is a non-destructive, chemically specific, surface sensitive technique – the surface sensitivity resulting from the short mean escape depth of the photoelectrons. The depth probed can be controlled by varying the excitation energy; higher photoelectron energies increasing the inelastic mean-free-path in the material.HAXPES studies of atomic diffusion from F-doped SnO2 substrates showed increased doping levels of Sn, Si and F in the deposited films. Diffusion from the substrate was detected at annealing temperatures between 550 °C and 800 °C. Films annealed in air exhibited improved photocatalytic behavior; a photocurrent of 0.23 mA/cm2 was observed for those films, while the as-deposited hematite films showed no photo-activity whatsoever.The optical properties of low-dimensional hematite were studied in a series of ultra-thin films (thicknesses in the 2-70 nm range). The absorption maxima were shifted to higher energies for films thinner than 20 nm, revealing a different electronic structure in thin films." @default.
- W117095909 created "2016-06-24" @default.
- W117095909 creator A5000509239 @default.
- W117095909 creator A5023688819 @default.
- W117095909 creator A5045228279 @default.
- W117095909 creator A5055641359 @default.
- W117095909 creator A5059068202 @default.
- W117095909 date "2014-01-01" @default.
- W117095909 modified "2023-10-12" @default.
- W117095909 title "Phase control of iron oxides grown in nano-scale cauliflower structures: hematite, maghemite and magnetite" @default.
- W117095909 hasPublicationYear "2014" @default.
- W117095909 type Work @default.
- W117095909 sameAs 117095909 @default.
- W117095909 citedByCount "0" @default.
- W117095909 crossrefType "journal-article" @default.
- W117095909 hasAuthorship W117095909A5000509239 @default.
- W117095909 hasAuthorship W117095909A5023688819 @default.
- W117095909 hasAuthorship W117095909A5045228279 @default.
- W117095909 hasAuthorship W117095909A5055641359 @default.
- W117095909 hasAuthorship W117095909A5059068202 @default.
- W117095909 hasConcept C113196181 @default.
- W117095909 hasConcept C127413603 @default.
- W117095909 hasConcept C171250308 @default.
- W117095909 hasConcept C175708663 @default.
- W117095909 hasConcept C185592680 @default.
- W117095909 hasConcept C19067145 @default.
- W117095909 hasConcept C191897082 @default.
- W117095909 hasConcept C192562407 @default.
- W117095909 hasConcept C2777697756 @default.
- W117095909 hasConcept C2777781897 @default.
- W117095909 hasConcept C2777855556 @default.
- W117095909 hasConcept C2779131772 @default.
- W117095909 hasConcept C2780786144 @default.
- W117095909 hasConcept C42360764 @default.
- W117095909 hasConcept C43617362 @default.
- W117095909 hasConcept C69544855 @default.
- W117095909 hasConceptScore W117095909C113196181 @default.
- W117095909 hasConceptScore W117095909C127413603 @default.
- W117095909 hasConceptScore W117095909C171250308 @default.
- W117095909 hasConceptScore W117095909C175708663 @default.
- W117095909 hasConceptScore W117095909C185592680 @default.
- W117095909 hasConceptScore W117095909C19067145 @default.
- W117095909 hasConceptScore W117095909C191897082 @default.
- W117095909 hasConceptScore W117095909C192562407 @default.
- W117095909 hasConceptScore W117095909C2777697756 @default.
- W117095909 hasConceptScore W117095909C2777781897 @default.
- W117095909 hasConceptScore W117095909C2777855556 @default.
- W117095909 hasConceptScore W117095909C2779131772 @default.
- W117095909 hasConceptScore W117095909C2780786144 @default.
- W117095909 hasConceptScore W117095909C42360764 @default.
- W117095909 hasConceptScore W117095909C43617362 @default.
- W117095909 hasConceptScore W117095909C69544855 @default.
- W117095909 hasLocation W1170959091 @default.
- W117095909 hasOpenAccess W117095909 @default.
- W117095909 hasPrimaryLocation W1170959091 @default.
- W117095909 hasRelatedWork W1935323113 @default.
- W117095909 hasRelatedWork W1964942259 @default.
- W117095909 hasRelatedWork W1984732716 @default.
- W117095909 hasRelatedWork W1988786030 @default.
- W117095909 hasRelatedWork W2024272507 @default.
- W117095909 hasRelatedWork W2027295982 @default.
- W117095909 hasRelatedWork W2062381615 @default.
- W117095909 hasRelatedWork W2071866632 @default.
- W117095909 hasRelatedWork W2099315674 @default.
- W117095909 hasRelatedWork W2156751411 @default.
- W117095909 hasRelatedWork W2290025489 @default.
- W117095909 hasRelatedWork W2776887753 @default.
- W117095909 hasRelatedWork W2791768538 @default.
- W117095909 hasRelatedWork W2806955724 @default.
- W117095909 hasRelatedWork W2947331965 @default.
- W117095909 hasRelatedWork W2982035644 @default.
- W117095909 hasRelatedWork W3004565907 @default.
- W117095909 hasRelatedWork W3008862346 @default.
- W117095909 hasRelatedWork W45029489 @default.
- W117095909 hasRelatedWork W92818995 @default.
- W117095909 isParatext "false" @default.
- W117095909 isRetracted "false" @default.
- W117095909 magId "117095909" @default.
- W117095909 workType "article" @default.