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Relevant bibliographies by topics / Titanium Dioxide Dielectric

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Academic literature on the topic 'Titanium Dioxide Dielectric'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Titanium Dioxide Dielectric"

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Al-Salimi, Mokhtar S. S., Wesam R. N. Ali, and Khaled M. Habeb. "OPTICAL AND DIELECTRIC PROPERTIES OF EPOXY RESIN FILLED WITH TITANIUM DIOXIDE PARTICLES." Electronic Journal of University of Aden for Basic and Applied Sciences 4, no. 2 (June 30, 2023): 147–54. http://dx.doi.org/10.47372/ejua-ba.2023.2.250.

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This work studies the electrical properties for pure epoxy, and epoxy with (0, 1, 1.5, 2 wt%) titanium dioxide powder composites. The effects of titanium dioxide contents on optical and dielectrically properties of the epoxy/ titanium dioxide have investigated by several techniques were used to characterize the epoxy/titanium dioxide: UV-visible spectrophotometer reveals a new absorption band in the wavelength range (350-600) nm. The findings of this investigation show that when the proportion of titanium dioxide added increases, the absorbance increases which are ascribed to interchain interaction. The absorption coefficient (α), extinction coefficient (k), refractive index (n), the real and imaginary permittivity (εr, εi), and energy gap (Eg) of epoxy/titanium dioxide samples were effectively determined from the recorded data optical transmission technique. In addition, these epoxy have been examined in the wavenumber range (4000-500 cm-1) using an FT-IR spectrometer and also a dielectric constant measurement. The thickness of all the samples is 1.2 mm ± 0.1 mm.

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Mohaimeed, Ameen alwan. "The Study the Influence of TiO2-Nanoparticles Doped in Polyvinyl Alcohol by Measuring Optical Properties of PVA Films." Iraqi Journal of Nanotechnology, no. 3 (October 14, 2022): 59–70. http://dx.doi.org/10.47758/ijn.vi3.62.

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It was investigated how titanium dioxide nanoparticles affected the optical properties of polyvinyl alcohol. Polymer nanocomposites (PVA-TiO2) are created via stirring and casting. The results demonstrate that transmittance improves from 75% to 95% while titanium dioxide concentration enhances the absorbance of nanocomposites. Nanocomposite films made of PVA and TiO2 had reflectance values of 12 and 16 percent (weight percent=0.15 and 0.85%).The refractive index and coefficient of extinction rise with increasing density, and optical absorption and photon dispersion in the nanocomposite (PVA-TiO2) also rise as the concentration of titanium dioxide nanoparticles rises. Real dielectric (r) and imaginary dielectric I constants also rise as titanium dioxide nanoparticle concentration does. The results show that when the weight % of (TiO2) nanoparticles increased, the energy gap decreased from 3.32 to 2.23. Additionally, optical conductivity increased with the concentration of (TiO2) NPs. Nanocomposites of PVA and TiO2 are essential for optical applications.

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Shim, S. S., J. Y. Woo, H. M. Jeong, and B. K. Kim. "High Dielectric Titanium Dioxide Doped Holographic PDLC." Soft Materials 7, no. 2 (June 2009): 93–104. http://dx.doi.org/10.1080/15394450902907608.

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Cheng, Fei, Emanuele Verrelli, Fahad A. Alharthi, Stephen M. Kelly, Mary O'Neill, Neil T. Kemp, Stuart P. Kitney, Khue T. Lai, Georg H. Mehl, and Thomas Anthopoulos. "Lyotropic ‘hairy’ TiO2 nanorods." Nanoscale Advances 1, no. 1 (2019): 254–64. http://dx.doi.org/10.1039/c8na00054a.

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Titanium dioxide nanorods coated with phosphonate ligands with photoreactive coumarin in a terminal position were prepared. These nanorods form liquid crystalline solutions at high concentrations. Relatively high dielectric constant thin films were prepared from the solution-processable and photocrosslinkable hybrid inorganic/organic titanium dioxide nanorods.

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Feng, Yao, Zhang Zhao Weng, Wen Hao Xu, and Zhao Xian Xiong. "High Performance of Rutile Titanium Dioxide Whiskers/Epoxy Resin Composites." Materials Science Forum 867 (August 2016): 93–97. http://dx.doi.org/10.4028/www.scientific.net/msf.867.93.

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Rutile TiO2 whisker/epoxy resin composites were prepared by hot-pressing process method. The effects of different content of TiO2 whiskers on the microstructure, microwave dielectric properties and flexural strength for TiO2/epoxy resin composites were investigated. Results show that flexural strength increased firstly, which can reach the maximum value (105.53 Mpa), then decreased with the content of TiO2 whisker (v%) increase. Moreover, the dielectric constant and dielectric loss of the TiO2/epoxy resin composites increase with the increased of TiO2 whisker (v%). When the content of TiO2 whisker is 60 v%, the TiO2 whisker/epoxy resin composites exhibit a higher permittivity (εr = 10.74) and relatively low dielectric loss (tanθ= 0.021).

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Mohammed, Tawfik Mahmood. "Mathematical modeling of the electronic structure of Titanium dioxide \((TiO_2 )_6\) nanoparticles." University of Aden Journal of Natural and Applied Sciences 24, no. 2 (March 22, 2022): 519–26. http://dx.doi.org/10.47372/uajnas.2020.n2.a19.

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The calculation of the number of atoms of the given dimensional nanoparticle, composed of different type atoms has been researched in this work. The calculations have been carried out for nanoparticles of titanium dioxide. Theoretical visual models have been configured, and quantum – mechanical calculations have been carried out for \((TiO_2 )_6\) nanoparticle. The calculations for titanium dioxide nanoparticle have been carried out on the basis of Gaussian atomic orbitals. Besides, Gaussian functions have been used as atomic orbitals. The numerical values of unknown coefficients of the linear combination of atomic orbitals of the atoms of the titanium nanoparticle have been found from the solution of Hartree–Fock–Roothaan (HFR) equations.The values of orbital energies, ionization potential, and the total electronic energy of titanium dioxide nanoparticles have been determined. The calculations show that ,titanium dioxide nanoparticle is tough, electrophile, and stable dielectric, material. The effective charge of atoms have been calculated, and the theoretical visual mode of titanium dioxide nanopartical have been constructed.

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Aaditya, V. B., B. M. Bharathesh, R. Harshitha, B. V. Chaluvaraju, U. P. Raghavendra, and M. V. Murugendrappa. "Study of dielectric properties of polypyrrole/titanium dioxide and polypyrrole/titanium dioxide-MWCNT nano composites." Journal of Materials Science: Materials in Electronics 29, no. 4 (November 13, 2017): 2848–59. http://dx.doi.org/10.1007/s10854-017-8214-6.

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Madani, L., K. S. Belkhir, and S. Belkhiat. "Experimental Study of Electric and Dielectric Behavior of PVC Composites." Engineering, Technology & Applied Science Research 10, no. 1 (February 3, 2020): 5233–36. http://dx.doi.org/10.48084/etasr.3246.

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Polyvinyl chloride (PVC) is usually used as insulation in electrical engineering, mainly as cable insulation sheaths. A method for improving PVC’s dielectric properties, reducing the effects of UV aging, is the use of PVC films doped in alumina and titanium dioxide. This research investigated the influence of alumina and titanium dioxide (Al2O3/TiO2) on the dielectric properties of PVC. Four PVC samples were examined using an RLC impedance analyzer. Fourier Transform Infrared (FTIR) spectroscopy was utilized on the sample’s surfaces, exploring the chemical stability of the tested materials. In addition, the volume resistivity and average breakdown voltage of each sample were examined. Doping Al2O3/TiO2 into PVC improved its dielectric properties and volume resistivity while adding more ceramic decreased volume resistivity. Furthermore, the addition of Al2O3/TiO2 caused a significant enhancement in voltage breakdown strength.

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Chueangchayaphan, Wannarat, Piyawadee Luangchuang, and Narong Chueangchayaphan. "High Performance of Titanium Dioxide Reinforced Acrylonitrile Butadiene Rubber Composites." Polymers 14, no. 23 (December 2, 2022): 5267. http://dx.doi.org/10.3390/polym14235267.

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Recently, dielectric elastomer actuators (DEA) have emerged as one of the most promising materials for use in soft robots. However, DEA needs a high operating voltage and high mechanical properties. By increasing the dielectric constant of elastomeric materials, it is possible to decrease the operating voltage required. Thus, elastomeric composites with a high dielectric constant and strong mechanical properties are of interest. The aim of this research was to investigate the effect of titanium dioxide (TiO2) content ranging from 0 to 110 phr on the cure characteristics, and physical, dielectric, dynamic mechanical, and morphological properties of acrylonitrile butadiene rubber (NBR) composites. The addition of TiO2 reduced the scorch time (ts1) as well as the optimum cure time (tc90) but increased the cure rate index (CRI), minimum torque (ML), maximum torque (MH), and delta torque (MH − ML). The optimal TiO2 content for maximum tensile strength and elongation at break was 90 phr. Tensile strength and elongation at break were increased by 144.8% and 40.1%, respectively, over pure NBR. A significant mechanical property improvement was observed for TiO2-filled composites due to the good dispersion of TiO2 in the NBR matrix, which was confirmed by scanning electron microscopy (SEM). Moreover, incorporating TiO2 filler gave a higher storage modulus, a shift in glass transition temperature (Tg) to a higher temperature, and reduced damping in dynamic mechanical thermal analysis (DMTA). The addition of TiO2 to NBR rubber increased the dielectric constant of the resultant composites in the tested frequency range from 102 to 105 Hz. As a result, TiO2-filled NBR composite has a high potential for dielectric elastomer actuator applications.

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Yang, Dan, Shuo Huang, Yibo Wu, Mengnan Ruan, Shuxin Li, Yuwei Shang, Xiuguo Cui, Yang Wang, and Wenli Guo. "Enhanced actuated strain of titanium dioxide/nitrile-butadiene rubber composite by the biomimetic method." RSC Advances 5, no. 80 (2015): 65385–94. http://dx.doi.org/10.1039/c5ra12311a.

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Dissertations / Theses on the topic "Titanium Dioxide Dielectric"

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Chow, Yuet Sim. "Photoconductivity and microwave dielectric studies on titanium dioxide pigments." Thesis, Manchester Metropolitan University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359642.

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Chen, Qianqian. "Synthesis of Photocatalytic Titanium Dioxide and Nitrogen Doped Titanium Dioxide Coatings Using an Atmospheric Dielectric Barrier Discharge." Doctoral thesis, Universite Libre de Bruxelles, 2018. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/276815.

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In this thesis, we focused on understanding the synthesis of titanium dioxide (TiO2) films and nitrogen doped TiO2 films using an atmospheric pressure Dielectric Barrier Discharge (DBD). The first part of the work was dedicated to the deposition of TiO2 films by cold plasma DBD with titanium tetraisopropoxide as precursor in a single-step process at room temperature. The deposition rate was about 70 nm·min-1. The photocatalytic degradation rate for the degradation of methylene blue (MB) under ultra violet (UV) irradiation of the TiO2 film after annealing was close to a reference anatase TiO2 spin coated film. Moreover, the TiO2 films showed a good photocatalytic stability. The second part of the study focused on the optimization and the understanding of the effect of the plasma parameters (gas flow rate and power) on the morphology of the TiO2 films and on the investigation of the deposition mechanisms. The morphology of the film changed from granular to compact film by either increasing the total flow rate or decreasing the plasma power. In other words, adapting the energy density in the plasma allowed the control of the morphology of the TiO2 films. To our knowledge, it was the first time that the energy density parameters of the plasma were used to control the morphology of TiO2 films. The photocatalytic degradation rate for the degradation of MB under UV irradiation of the annealed TiO2 film turned out to be about 2 and 15 times higher than the one of the commercial TiO2 film and the as-deposited TiO2 films, respectively. In order to extend the light utilization to the visible light range, TiO2 films were doped with nitrogen using a room temperature argon/ammonia plasma discharge. XPS and SIMS results confirmed that the nitrogen has been incorporated in the TiO2 lattice mostly in Ti-N state. This was further confirmed by Raman spectroscopy and XRD. The plasma properties and the doping mechanism were studied by Optical Emission Spectroscopy. It is suggested that the NH radicals played a key role in the doping of TiO2. The concentration of nitrogen in the N-TiO2 coatings could be tuned by adapting the ratio of NH3 in the plasma or the plasma power. The band gap of our N-TiO2 coatings is lower than the one of undoped TiO2 coating. The photocatalytic degradation rate for N-TiO2 coating was more than 4 times higher than the one of the undoped TiO2 coating.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished

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Yoon, Meeyoung. "Deposition and characterization of titanium dioxide and hafnium dioxide thin films for high dielectric applications /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/10619.

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Dong, Wen. "Defect Engineering in Controlling the Dielectric Behaviour of Rutile Titanium Dioxide." Phd thesis, Canberra, ACT : The Australian National University, 2017. http://hdl.handle.net/1885/128472.

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Defects have gained increasing attention for their capability in tailoring the properties and/or exploring new functionalities in oxide materials. For instance, the colossal permittivity (CP, >103) was successfully achieved by introducing the acceptor/donor co-doping in rutile TiO2. The resultant dielectric properties can be either affected by the defect-induced polarisation or totally dominated by the defects. The defect configurations and its related dielectric properties vary with the different properties of dopant ions, e.g. ionic size, electronegativity, valence state, and so on. More interestingly, the different dopant ions affect their nearby environment differently in structurally strong correlated solid-state system, which may lead to special defect complexes. The research on the dielectric properties of defect-engineered rutile TiO2 is still at early stage and more work need to be done in this field for comprehensive understanding the defect chemistry and dielectric polarization behaviours. This dissertation, therefore, aims to use defect engineering to control the dielectric behaviour of rutile TiO2. Stimulated by the excellent CP behaviour achieved in In+Nb co-doped rutile TiO2, investigation was carried out on the CP behaviour of Ga and Nb co-doped rutile TiO2 i.e. Ga0.5xNb0.5xTi1-xO2 (x = 0.1%, 0.5%, 5%, 10%), where Ga3+ is from the same group as In3+ but with a much smaller ionic radius. Colossal permittivity up to 104 ~ 105 with an acceptably low dielectric loss (tan δ = 0.05 ~ 0.1) over broad frequency/temperature ranges is obtained at x = 0.5% after systematic synthesis optimizations. Systematic structural, defect and dielectric characterizations suggest that the CP in this system is not dominated by the EPDD. Instead, multiple polarisation mechanisms including defect dipoles, polaron-like electron hopping/transport and a surface barrier layer capacitor effect together make contributions to the CP behaviour observed in this new material. This work provides a comprehensive guide for the design of new CP materials by considering the choice of the acceptor dopant. CP materials have many important applications in electronics but their development has generally been obscured due to the difficulty in achieving a relatively low dielectric loss. A new ionic co-doping material system, i.e. In+Ta co-doped TiO2 with nominal compositions In0.5xTa0.5xTi1-xO2 (x = 0.5%, 5%, and 10%), was also systematically investigated. This system manifests high dielectric permittivity and low dielectric loss based on the electron-pinned defect-dipole. The dielectric loss can be reduced down to e.g. 0.002 at 1k Hz, giving high performance, less temperature-independent dielectric property i.e. εr >104 meanwhile tan δ <0.02 in a broad temperature range of 50-400 K. Density functional theory computation coupled with the defect analysis uncover electron-pinned defect-dipoles (EPDDs), in the formation of highly stable triangle-diamond and/or triangle-linear dopant defect clusters with well-defined relative positions for Ti reduction, are also presented in the host material for the CP observed. Such a high-performance dielectric property would thus help for practical applications and discovery of promising new materials of this type. Furthermore, synthesis of bivalent acceptor and pentavalent donor co-doped rutile TiO2 was carried out to further understand the EPDDs. A new EPDD in rutile TiO2 was made by co-doping Mg and Ta with nominal composition Mgx/3Ta2x/3Ti1-xO2 (x = 0.5%, and 5%), which was characterized to exhibit colossal permittivity (>7000) as well as ultralow dielectric loss (e.g. 0.002 at 1 kHz) over a broad frequency/temperature range after optimized process conditions at x = 0.5%. Both experimental and theoretical evidences indicate such a colossal permittivity and low dielectric loss originate from the intragrain polarisation that links to the electron pinned defect clusters with a specific configuration, which differs from the defect cluster previously reported in tri-/pent-valent ion co-doped rutile TiO2. This work not only extends the research on colossal permittivity to bi-/penta-valent ion co-doped rutile TiO2, but also for the first time shows a likely defect cluster model existed in this system. These results further benefit the development of colossal permittivity materials and advance the defect chemistry in solids. With the success in synthesizing heavily Al+Ta co-substituted rutile TiO2 structure with nominal composition Al0.5xTa0.5xTi1-xO2 (x up to 50%), the dielectric properties of this type materials were systematically investigated. Structural characterizations and Raman spectra suggest that the materials maintain rutile TiO2 phase even for x up to 50% and there is signature of disorder. Defect analysis and dielectric characterisations suggest the significantly low ratio of Ti3+/Ta5+ as well as magnitude of permittivity (800~3000) in this new system, both of which are much smaller than that of the systems previously described or reported. Interestingly and surprisingly, the permittivity increases as x increases up to 20% and decreases after over 20% followed by exponential decrease of relaxation frequency as well as significant increase of the thermal activation temperature for defect dipole relaxation (e.g. the thermal activation energy increases from 33.4 meV to 131.4 meV when x increases from 5% up to 50%). The system present a typical dipole-glass character especially when x increases over 20%. This dissertation also reports for the first time, by using defect engineering, the linear polarisation behaviour of binary oxide, e.g. rutile TiO2 can be changed to a nonlinear one at room temperature. With slightly doping acceptor Mg into rutile TiO2, a combination of electrical measurements and theoretical calculations suggest that Mg-oxygen vacancy defect dipole can facilitate certain neighboring Ti4+ with large move-off-center ability, offering the doped rutile TiO2 an unexpected role as a new family of room temperature nonlinear dielectrics. More importantly, a poling induced internal electric field abnormally varies with the direction of poling electric field can be observable, which is quite different from that observed in ferroelectrics and relaxor ferroelectrics. Despite its potential novel applications in electronic and energy related areas, this research provides a newly/fundamentally important picture about the role of defects and its interaction with crystal environment.

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Li, Qiong. "Titanium dioxide dielectric layers made by anodization of titanium: the effect of dissolved nitrogen and oxygen." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1365198961.

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Ngqongwa, Lundi Vincent. "Electrochemical characterization of nanostructured SnO2 and TiO2 for potential application as dielectric materials in sulfonated-polyaniline based supercapacitors." Thesis, University of the Western Cape, 2010. http://hdl.handle.net/11394/2575.

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Magister Scientiae - MSc
In this research project, nanostructured composites based on Tin dioxide (SnO2) and Titanium dioxide (TiO2) with poly-4-styrene sulfonic acid (PSSA) doped polyaniline (PANI) conducting polymer has been investigated based on their structural, electrical and electrochemical properties. The synthesis of conducting polymers and their metal oxide or composites have been carried out chemically or electrochemically according to methods modified from the literature. Layer-by-layer construction of nano-Metal Oxide/PSSA doped polyaniline composites were successfully constructed by electroanalytical methods on the surface of a glassy carbon working electrode (GCE).
South Africa

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CRIPPA, MAURIZIO. "Hybrid and nanocomposite concepts: a driving force for novel materials." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2013. http://hdl.handle.net/10281/42253.

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The general concepts of hybrid and nanocomposite were used not only to classify but also to drive the synthesis optimizing the materials for the different applications. The common denominator of each material was the titanium dioxide as photoreactive material, chapters 3 and 4, and dielectric material in chapter 5. Because both the morphology and the crystal phase of the titanium dioxide play a crucial role on the material performances the used TiO2 was always synthesized ex situ by hydrothermal synthesis allowing to control the morphological characteristics. In the chapter 3 and 4 anatase phase was used for its photocatalytic ability in presence of oxygen and water while in the chapter 5 the rutile phase was used because its highest dielectric constant compare anatase. In chapter 3 a polyacrilate composite material prepared by mechanical mixing of nanocrystalline titania with acrylate oligomers shows that, without titania surface functionalisation, the oxide forms micrometric aggregates reducing the exposed surface of the TiO2. Despite the filler aggregation the material preserves its photocatalytic properties. As drawback of the photocatalytic activity in phenol photomineralisation (use to simulate pollutants in water) some photooxidative degradation phenomena involve the organic matrix. Hence the necessity to have a stable material was the driving force to create a new material containing titania as photoactive material while embedded into an inorganic matrix. In the chapter 4 this porous and UV transparent inorganic-inorganic nanocomposite material is described. In order to obtain the desired porosity of the final material the silica sol-gel solution was mixed with PEG obtaining a class I hybrid material. During the silica formation PEG segregates in warm-like polymeric phase that, once the material is calcinated, leaves the voids conferring the desired macroporosity to the material. The photoactive oxide, previously functionalized on the surface with organic molecules, migrates in the polymeric phase during silica precursors hydrolysis and condensation. After calcination the titania nanocrystallites decorate the wall of the channels leaved by the organic species remotion. The molecules functionalizing the catalyst surface induce the TiO2 migration into the PEG phase because of their more affinity with polymer instead with silica. The exposed titania is then able to freely react with pollutants while the silica matrix provides the UV transparency and macroporosity for the photocatalytic reactions. The abatement efficiency of the material is comparable with slurry TiO2. The material is not affected by the photocatalyst leaching demonstrating that it is suitable for an industrial application. The nanocomposite material was tested for NOx degradation too using P25 commercial titania instead of home made one demonstrating the generality of the preparation method. The abatement efficiency of the NOx was comparable with the DENOX technology currently used for industrial applications. In chapter 5 the same reaction technique used to functionalize the nanoparticles in the chapter 4 was used to functionalize rutile titania nanoparticles with a RAFT reagent. After the styrene “polymerization from” reaction polystyrene chains were obtained. The brush like conformation of the chains justifies the high polymer surface density. The functionalized nanoparticles (class II material) are mixed in different concentrations with commercial polystyrene. The different concentration materials present good dispersion because of the high compatibilization properties of the surface functionalisation. At high concentrations the material shows a percolative behavior ascribed to the formation of chestnut like aggregates which increase the relative dielectric constant. Despite the charges percolation trough the material the polymeric surface layer acts as an insulating layer which contributes to mitigate the charge mobility and consequently the conductivity of the material. The low conductivity of the material allows to obtain low tanδ values. The low tanδ values in a large range of frequencies allows to candidate the material for radio frequency (RF) applications where very low dissipation factor is desired to avoid signal losses. In conclusion the present work, despite it covers three different materials, demonstrates how it is possible to create and optimize a material modifying the surface of the nanoparticles in order to confer them peculiar properties which drive the final material morphology. The final material morphology is then able to combine the properties both of the active material and of the matrix giving a new optimized material for a specific application.

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Mendonça, Bianca Jardim. "Produção e caracterização de filmes finos de TiO2." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-03052018-111901/.

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Nesse trabalho foram fabricados filmes finos de TiO2 por RF magnetron sputtering reativo sobre substrato de silício (1 0 0). A pressão parcial do oxigênio na câmara foi variada de 5 a 100% em relação ao argônio. Após a deposição os filmes foram submetidos a tratamento térmico em atmosfera de oxigênio. A estequiometria dos filmes e o perfil de profundidade foram obtidos por RBS. A estrutura cristalina foi obtida por XRD. As propriedades ópticas foram obtidas por interferometria e reflectância e as elétricas por meio das curvas C-V. Os valores de espessura dos filmes sem tratamento térmico aumentaram aproximadamente 41% com o aumento do oxigênio na câmara de deposição. Essa variação está ligada ao aumento da eficiência do sputtering do alvo. Os índices de refração dos filmes sem tratamento térmico se mantiveram dentro de um intervalo de aproximadamente 2,3 a 2,4. A diminuição do band gap com o tratamento térmico é consequência da mudança de fase cristalográfica de anatase para rutila. A estequiometria TiOx dos filmes antes do tratamento térmico apresentaram valores de x entre 2,0 e 2,4. A espessura em TFU dos filmes aumentou com o percentual de oxigênio na câmara. As amostras que receberam tratamento térmico apresentaram difusão de titânio na interface do substrato e incorporação de oxigênio no filme. Os valores da constante dielétrica aumentaram com o percentual de oxigênio na câmara, em contraposição com o efeito do tratamento térmico que diminuiu o valor. Todos os resultados observados são coerentes do ponto de vista da mudança de fase anatase rutila e aumento do percentual de oxigênio na câmara.
In this work thin films of TiO2 were produced by reactive RF magnetron sputtering on silicon substrate (1 0 0). The oxygen partial pressure in the chamber was varied from 5 to 100% in relation to argon. After deposition the films were submitted to thermal treatment under an oxygen atmosphere. The stoichiometry of the films and the depth profile were obtained by RBS. The crystal structure was obtained by XRD. Its optical properties were obtained by interferometry and reflectance and the electrical were obtained by means of the C-V curves. The thickness values of films without heat treatment increased approximately 41% with the increase of oxygen in the deposition chamber. This variation is linked to the increased sputtering efficiency of the target. The refractive indexes of films without heat treatment remained within a range of about 2.3 to 2.4. The decrease of the band gap with the heat treatment is a consequence of the change of crystallographic phase from anatase to rutile. The TiOx stoichiometry of the films before the heat treatment showed values of x between 2.0 and 2.4. The TFU thickness of the films increased with the percentage of oxygen in the chamber. The samples that received heat treatment shows diffusion of titanium at the interface of the substrate and incorporation of oxygen in the film. The values of the dielectric constant increased with the percentage of oxygen in the chamber, as opposed to the effect of the thermal treatment that decreased the value. All the results observed are consistent from the point of view of the anatase - rutile phase transition and the increase in the oxygen percentage in the chamber.

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Ráček, Tomáš. "Dielektrické vlastnosti epoxidové pryskyřice plněné nanočásticemi." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218698.

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This diploma thesis is focused on the analysis of basic problematics of dielectrics and nanocomposites. It describes the fabrication of experimental samples of nanocomposites from sealing epoxy resin and nanoparticles of titanium dioxide with various weight filling. Further, the thesis deals with measuring and evaluation of dielectric properties of the samples. It examines the influence of weight filling, temperature and frequency of the electric field on volume resistivity, relative permitivity and loss factor.

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GALIZIA, PIETRO. "Production and morphological and microstructural characterization of bulk composites or thick films for the study of multiphysics interactions." Doctoral thesis, Politecnico di Torino, 2017. http://hdl.handle.net/11583/2674672.

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The surge of interest in multifunctional materials over the past 15 years has been driven by their fascinating physical properties and huge potential for technological applications such as sensors, microwave devices, energy harvesting, photovoltaic technologies, solid-state refrigeration, and data storage recording technologies. Among the others, magnetoelectric multiferroic composites are a special class of advanced solid-state compounds with coupled ferromagnetic and ferroelectric ferroic orders which allow to perform more than one task by combining electronic, magnetic and mechanical properties into a single device component. The production and characterization of lead zirconate titanate (PZT)- cobalt ferrite composites was the main topic of the thesis. During the PhD activity different ceramic processing and characterization technologies were studied and involved in order to optimize the produced materials as a function of the final microstructural and functional properties. The synthesis of cobalt ferrite (CF) and niobium-doped lead zirconate titanate (PZTN) powders by solid state reaction method and sol-gel technique, to control the particle size distributions and their microstructural and functional properties through calcination and milling treatments has been addressed first, followed by the mixing of the PZT and CF powders to produce particulate composites. The dispersion of PZT and CF in a liquid media, to produce layered composites by depositing the particles by electrophoretic deposition was an objective of the work as well. Key issues such as the lead loss during the sintering of PZTN-CF composites and the reaction between CF and titania have been addressed and have resulted in improvements in the sintering and characterization techniques leading to the production of fully dense PZTN-CF dual-particulate composites. In particular, the optimized sintering parameters have configured a new paradigm of ceramic sintering, which has been called quite-fast sintering, in respect to the traditional one, and the study of the PbO loss has led to propose an equation to calculate the PbO loss through XRD analysis. Further important achieved results were: the production of nanocobalt ferrite particles by multi-step milling, the correlation between the spin-canting angle with the microstrain and the average crystallite size of nanocobalt ferrite particles, the understanding of the CF growth mechanisms, the extension of the Globus model from small ferromagnetic grains “having no defect inside” to multiparallel-twinned overgrown ones, the understanding of heating rate effect on the interface nucleation onset of the anatase-to-rutile transformation and the anatase particle size, and the reaction products between CF and rutile at 1200 °C at the variation of CF/rutile ratio.

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Book chapters on the topic "Titanium Dioxide Dielectric"

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Chao, Sheng, and Fatih Dogan. "Synthesis, Sintering and Dielectric Properties of Nano Structured High Purity Titanium Dioxide." In Ceramic Transactions Series, 21–30. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470528976.ch2.

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Saji, Joel, Akhela Umapathi, S. R. Manohara, P. N. Navya, Mamta Kumawat, Divya Prakash, and Hemant Kumar Daima. "Polyvinyl Alcohol Scaffold Incorporated with Silver Nanoparticles and Titanium Dioxide: Electrical, Dielectric, Dye Degradation, and Antibacterial Properties." In Advances in Mechanical Engineering, 367–79. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0942-8_36.

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Cannavale, Alessandro, and Giovanni Lerario. "TiO2 oxides for chromogenic devices and dielectric mirrors." In Titanium Dioxide (Tio₂) and Its Applications, 483–505. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-819960-2.00003-1.

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Conference papers on the topic "Titanium Dioxide Dielectric"

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Mondal, Sandip, Arvind Kumar, K. S. R. Koteswara Rao, and V. Venkataraman. "Highly reliable spin-coated titanium dioxide dielectric." In DAE SOLID STATE PHYSICS SYMPOSIUM 2015. Author(s), 2016. http://dx.doi.org/10.1063/1.4947895.

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Ben Omar, M., and A. Matoussi. "Dielectric and conductivity investigations of rutile titanium dioxide single crystals." In 2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP 2012). IEEE, 2012. http://dx.doi.org/10.1109/ceidp.2012.6378821.

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Dhokne, Ragini, Shital More, and Nilesh Pathare. "Structural and dielectric relaxation study of polyvinyl-alcohol titanium dioxide composite films." In INTERNATIONAL CONFERENCE ON “MULTIDIMENSIONAL ROLE OF BASIC SCIENCE IN ADVANCED TECHNOLOGY” ICMBAT 2018. Author(s), 2019. http://dx.doi.org/10.1063/1.5100398.

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R, Balunarayanan, Aiswarya S, C. O. Sreekala, and Sreedevi K. Menon. "Nano Cylindrical Dielectric Resonator Antenna Using Titanium dioxide for Wi-Fi Applications." In 2021 Fourth International Conference on Electrical, Computer and Communication Technologies (ICECCT). IEEE, 2021. http://dx.doi.org/10.1109/icecct52121.2021.9616789.

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Zakaria, S., A. F. A. Osman, S. N. H. Mustapha, and L. K. Yiew. "Soft-hard hybrid filler for silicone based dielectric elastomer: Glycerol and titanium dioxide." In GREEN DESIGN AND MANUFACTURE: ADVANCED AND EMERGING APPLICATIONS: Proceedings of the 4th International Conference on Green Design and Manufacture 2018. Author(s), 2018. http://dx.doi.org/10.1063/1.5066824.

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Shengtao, Li, Yin Guilai, Ni Fengyan, Bai Suna, Li Jianying, and Zhang Tuo. "Investigation on the dielectric properties of nano-titanium dioxide — low density polyethylene composites." In 2010 10th IEEE International Conference on Solid Dielectrics (ICSD). IEEE, 2010. http://dx.doi.org/10.1109/icsd.2010.5568106.

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Chen, Siyu, Qian Xie, Zhengdong Wang, Mengmeng Yang, Jingya Liu, Jiale Mao, and Yonghong Cheng. "In-situ observation of electric field assisted alignment of titanium dioxide nanowires in epoxy resin." In 2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP). IEEE, 2017. http://dx.doi.org/10.1109/ceidp.2017.8257477.

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Wu, Xudong, Shuhui Yu, Suibin Luo, Rong Sun, and Ching-Ping Wong. "Self-healable and mechanically reinforced polyurethane/titanium dioxide dielectric nanocomposites by exchangeable disulfide links." In 2020 21st International Conference on Electronic Packaging Technology (ICEPT). IEEE, 2020. http://dx.doi.org/10.1109/icept50128.2020.9202857.

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Eremin, E. N., and K. G. Kukushina. "Dielectric properties of a composite material based on epoxy molding material and titanium dioxide." In OIL AND GAS ENGINEERING (OGE-2021). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0075030.

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Musa, M., Y. Z. Arief, Z. Abdul-Malek, M. H. Ahmad, and A. A. Abd Jamil. "Influence of nano-titanium dioxide (TiO2) on electrical tree characteristics in silicone rubber based nanocomposite." In 2013 IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP 2013). IEEE, 2013. http://dx.doi.org/10.1109/ceidp.2013.6748120.

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