Journal ArticleDOI
Titanium Oxide Nanoparticles Precipitated from Low‐Temperature Aqueous Solutions: III. Thin Film Properties
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TLDR
In this article, a methodology was developed to grow titania films with controlled microstructures and phases, which were characterized for their dielectric, optical, photoelectrochemical, and mechanical properties.Abstract:
In our previous reports (Part I and II), we have identified precursor “supersaturation” as a key parameter to control the precipitation behavior of titania nanoparticles in a temperature-driven hydrolysis process from the chemical bath of soluble titanium salt. Through this protocol, a methodology was developed to grow titania films with controlled microstructures and phases. In this study, we deposited titania films containing anatase or rutile as a dominant phase along with microstructures of various film densities, which were characterized for their dielectric, optical, photoelectrochemical, and mechanical properties. Specific microstructures and the constituting phases were responsible for a wide variation of such properties of titania thin films. This study aims to provide the systematic explanation for evolution of the phases as a function of the degree of supersaturation, along with the discussion of their effects on the aforementioned engineering properties.read more
Citations
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Hard and transparent films formed by nanocellulose-TiO2 nanoparticle hybrids
Christina Schütz,Christina Schütz,Jordi Sort,Zoltán Bacsik,Vitaliy Oliynyk,Eva Pellicer,Andreas Fall,Lars Wågberg,Lars Berglund,Lennart Bergström,German Salazar-Alvarez,German Salazar-Alvarez +11 more
TL;DR: Electron microscopy and infrared spectroscopy suggest that the nanostructure of the hybrids is controlled by electrostatic adsorption of the titania nanoparticles on the negatively charged nanocellulose surfaces.
Journal ArticleDOI
Grain size reduction on nanostructured TiO2 thin films due to annealing
TL;DR: In this paper, X-ray diffraction studies show that the obtained TiO2 thin films maintain the anatase phase till 800 °C annealing temperature, and the rutile phase appears at 900 °C.
Journal ArticleDOI
Precipitation Mechanisms of Mesoporous Nanoparticle Aggregates: Off-Lattice, Coarse-Grained, Kinetic Simulations
TL;DR: In this article, an off-lattice Kinetic Monte Carlo approach is presented to simulate various precipitation mechanisms at the mesoscale of nanoparticle aggregates, accounting for both solution chemistry and mechanical interactions.
Journal ArticleDOI
Dielectric Properties of Solution‐Deposited Crystalline Barium Titanate Thin Films
Biplab Kumar Roy,Junghyun Cho +1 more
TL;DR: In this article, a two-step solution-based process was developed to deposit high-k ceramic thin films, which showed a dielectric constant of 80 at 100 kHz.
Journal ArticleDOI
Shape-controlling effects of hydrohalic and carboxylic acids in TiO2 nanoparticle synthesis
Kai Sellschopp,Wolfgang Heckel,J Gäding,Clemens J. Schröter,Andreas Hensel,Tobias Vossmeyer,Horst Weller,Stefan Müller,Gregor B. Vonbun-Feldbauer +8 more
TL;DR: Computational modeling based on density functional theory with experimental techniques are combined to investigate the ability of various adsorbates, including hydrohalic and carboxylic acids, to influence NP shape and to identify mechanisms stabilizing specific surface facets.
References
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Warren C. Oliver,George M. Pharr +1 more
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Environmental Applications of Semiconductor Photocatalysis
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Effects of the substrate on the determination of thin film mechanical properties by nanoindentation
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TL;DR: In this paper, the effects of the substrate on the determination of mechanical properties of thin films by nanoindentation were examined, and the properties of aluminum and tungsten films on the following substrates: aluminum, glass, silicon and sapphire.
Journal ArticleDOI
Comparison of Dye-Sensitized Rutile- and Anatase-Based TiO2 Solar Cells
TL;DR: In this paper, a dye-sensitized rutile-based solar cell was developed and optimized to achieve a PV response close to that of the anatase-based cell.
Journal ArticleDOI
Phase-pure TiO 2 nanoparticles: anatase, brookite and rutile
D. Reyes-Coronado,Geonel Rodríguez-Gattorno,M E Espinosa-Pesqueira,Cesar Cab,R. de Coss,Gerko Oskam +5 more
TL;DR: It is proposed that anatase formation is dominated by surface energy effects, and that rutile and brookite formation follows a dissolution-precipitation mechanism, where chains of sixfold-coordinated titanium complexes arrange into different crystal structures depending on the reactant chemistry.
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