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Статті в журналах з теми "Titanium Dioxide Dielectric"

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Автор: Grafiati

Опубліковано: 6 вересня 2023

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1

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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Анотація:

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Wypych, Aleksandra, Izabela Bobowska, Milena Tracz, Agnieszka Opasinska, Slawomir Kadlubowski, Alicja Krzywania-Kaliszewska, Jaroslaw Grobelny, and Piotr Wojciechowski. "Dielectric Properties and Characterisation of Titanium Dioxide Obtained by Different Chemistry Methods." Journal of Nanomaterials 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/124814.

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Анотація:

We made comparison of titanium dioxide powders obtained from three syntheses including sol-gel and precipitation methods as well as using layered (tetramethyl)ammonium titanate as a source of TiO2. The obtained precursors were subjected to step annealing at elevated temperatures to transform into rutile form. The transformation was determined by Raman measurements in each case. The resulting products were characterised using Raman spectroscopy and dynamic light scattering. The main goal of the studies performed was to compare the temperature of the transformation in three titania precursors obtained by different methods of soft chemistry routes and to evaluate dielectric properties of rutile products by means of broadband dielectric spectroscopy. Different factors affecting the electrical properties of calcinated products were discussed. It was found that sol-gel synthesis provided rutile form after annealing at 850°C with the smallest particles size about 20 nm, the highest value of dielectric permittivity equal to 63.7, and loss tangent equal to 0.051 at MHz frequencies. The other powders transformed to rutile at higher temperature, that is, 900°C, exhibit lower value of dielectric permittivity and had a higher value of particles size. The correlation between the anatase-rutile transformation temperature and the size of annealed particles was proposed.

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12

Bakar, Nurul Ainon, Muhammad Azwadi Sulaiman, and Julie Juliewatty Mohamed. "Synthesis and characterization of titanium dioxide doped nickel oxide dielectric materials." Journal of Tropical Resources and Sustainable Science (JTRSS) 6, no. 1 (September 2, 2021): 31–35. http://dx.doi.org/10.47253/jtrss.v6i1.724.

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Nickel oxide (NiO) belongs to the transition metal oxide family, having good dielectric constantwith the range of 103 – 105, but it has high dielectric loss. In this research, the effect of titaniumdioxide (TiO2) addition into NiO was investigated. Generally, TiO2 was used in the application ofelectrical ceramic, catalysts, electric conductors and chemical intermediates. Ni1-xTixO1+x wasprepared via solid-state reaction method with 6 different TiO2 compositions. The preparation startedwith the powder mixing process for 24 hours and followed by calcination process at 950 °C for 4hours. Then, the calcined powders were compacted into 6 mm pellet shape under pressure of 250MPa pressure. Three pellets were made for each TiO2 composition. Those pellets were sintered at1250 °C for 5 hours. XRD results showed that pure NiO at 0.01 and 0.02 mole % of TiO2compositions produced single NiO crystalline phase, while 0.03, 0.05 and 0.10 mol % of TiO2showed the TiO2, instead of NiO phases. SEM analysis showed that increasing TiO2 concentrationmake the grain size increase, with 0.02 mole % of TiO2 gave the largest grain size, shows that 0.02mole % is the optimum TiO2 concentration for grain size enlargement. Furthermore, the bulkdensity of Ni1xTixO1+xpellet was reduces at higher TiO2 concentration. In dielectric test, the additionof 0.03 mole % of TiO2 gave the highest dielectric constant with value of 4.51 x 1014 and 0.05 mole% of TiO2 gives the result of lowest dielectric loss (0.53).

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13

Burns, G. P. "Titanium dioxide dielectric films formed by rapid thermal oxidation." Journal of Applied Physics 65, no. 5 (March 1989): 2095–97. http://dx.doi.org/10.1063/1.342856.

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14

Pamu, D., K. Sudheendran, M. Ghanashyam Krishna, K. C. James Raju, and Anil K. Bhatnagar. "Microwave dielectric behavior of nanocrystalline titanium dioxide thin films." Vacuum 81, no. 5 (January 2007): 686–94. http://dx.doi.org/10.1016/j.vacuum.2006.04.005.

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15

Mo, Te-Cheng, Hong-Wen Wang, San-Yan Chen, and Yun-Chieh Yeh. "Synthesis and dielectric properties of polyaniline/titanium dioxide nanocomposites." Ceramics International 34, no. 7 (September 2008): 1767–71. http://dx.doi.org/10.1016/j.ceramint.2007.06.002.

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16

Aluicio-Sarduy, Eduardo, Simone Callegari, Diana Gisell Figueroa del Valle, Andrea Desii, Ilka Kriegel, and Francesco Scotognella. "Electric field induced structural colour tuning of a silver/titanium dioxide nanoparticle one-dimensional photonic crystal." Beilstein Journal of Nanotechnology 7 (October 6, 2016): 1404–10. http://dx.doi.org/10.3762/bjnano.7.131.

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An electric field is employed for the active tuning of the structural colour in photonic crystals, which acts as an effective external stimulus with an impact on light transmission manipulation. In this work, we demonstrate structural colour in a photonic crystal device comprised of alternating layers of silver nanoparticles and titanium dioxide nanoparticles, exhibiting spectral shifts of around 10 nm for an applied voltage of only 10 V. The accumulation of charge at the metal/dielectric interface with an applied electric field leads to an effective increase of the charges contributing to the plasma frequency in silver. This initiates a blue shift of the silver plasmon band with a simultaneous blue shift of the photonic band gap as a result of the change in the silver dielectric function (i.e. decrease of the effective refractive index). These results are the first demonstration of active colour tuning in silver/titanium dioxide nanoparticle-based photonic crystals and open the route to metal/dielectric-based photonic crystals as electro-optic switches.

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17

MANGROLA, M. H., V. G. JOSHI, B. H. PARMAR, and A. S. PILLAI. "OPTICAL AND DIELECTRIC PROPERTIES OF THE COBALT DOPED TiO2 NANOPARTICLES." International Journal of Modern Physics: Conference Series 22 (January 2013): 332–35. http://dx.doi.org/10.1142/s2010194513010313.

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Cobalt doped Titanium Dioxide (TiO2) were synthesized by a standard solid-state reaction method. The dielectric constant and loss have been measured as a function of frequency (100 Hz-1 KHz) and temperature (50°C to 300°C). Similar behavior is observed between dielectric constant and dielectric loss. Both dielectric constant and dielectric loss are found to decrease with increasing frequency. Photoluminescence (PL) spectra were taken at different excitation wavelength. PL emission spectra shows a broad spectra in the range 400 nm to 500 nm.

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18

Shen, Zheng Bo, Xiao Hui Wang, Hui Ling Gong, and Long Tu Li. "Structural and Dielectric Properties of Rare Earth (Y, Ho) Doped Ba_0.95Ca_0.05Ti_0.85Zr_0.15O₃ Ceramics." Key Engineering Materials 602-603 (March 2014): 728–33. http://dx.doi.org/10.4028/www.scientific.net/kem.602-603.728.

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Ba0.95Ca0.05Ti0.85Zr0.15O3(BCTZ) dielectric ceramics were fabricated by traditional solid-state method, using barium carbonate, calcium carbonate, titanium dioxide and zirconium dioxide as the starting materials. Rare earth dopants have a significant influence on the dielectric properties of BCTZ ceramics. The doping effects of Y and Ho with different content on the dielectric properties and structure were studied respectively. The results reveal that the effects of Y and Ho are similar, they perfer to occpy B site, and they move the dielectric peak to lower temperature, widen the peak and increase the insulation resistivity, thus improve the dielectric properties obviously. The effects were investigated by X-ray diffraction, scanning electron microscope, and dielectric property measurements. After rare earth elements-doping, the BCTZ ceramics satify the Y5V EIA specifications, mainly due to the change of structure. The BCTZ dielectric ceramics with high permittivity over 10,000, high insulation resistivity over 1012Ωcm, low dielectric loss less than 1%, can be applied in multilayer ceramic capacitors (MLCCs).

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19

Freitas, Antonio E., Taise M. Manhabosco, Ronaldo J. C. Batista, Alan K. Rêgo Segundo, Humberto X. Araújo, Fernando Gabriel S. Araújo, and Adilson R. Costa. "Development and Characterization of Titanium Dioxide Ceramic Substrates with High Dielectric Permittivities." Materials 13, no. 2 (January 14, 2020): 386. http://dx.doi.org/10.3390/ma13020386.

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Titanium dioxide substrates have been synthesized by means of solid-state reactions with sintering temperatures varying from 1150 °C up to 1350 °C. X-ray diffraction and scanning electron microscopy (SEM) where employed to investigate the crystal structure, grain size and porosity of the resulting samples. The obtained ceramics are tetragonal (rutile phase) with average grain sizes varying from 2.94 µm up to 5.81 µm. The average grain size of samples increases with increasing temperature, while the porosity decreases. The effect of microstructure on the dielectric properties has been also studied. The reduction of porosity of samples significantly improves the dielectric parameters (relative dielectric permittivity and loss tangent) in comparison to those of commercial substrates, indicating that the obtained ceramic substrates could be useful in the miniaturization of telecommunication devices.

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20

Huang, Her-Hsiung, Zhi-Hwa Chen, Diem Thuy Nguyen, Chuan-Ming Tseng, Chiang-Sang Chen, and Jean-Heng Chang. "Blood Coagulation on Titanium Dioxide Films with Various Crystal Structures on Titanium Implant Surfaces." Cells 11, no. 17 (August 23, 2022): 2623. http://dx.doi.org/10.3390/cells11172623.

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Background: Titanium (Ti) is one of the most popular implant materials, and its surface titanium dioxide (TiO2) provides good biocompatibility. The coagulation of blood on Ti implants plays a key role in wound healing and cell growth at the implant site; however, researchers have yet to fully elucidate the mechanism underlying this process on TiO2. Methods: This study examined the means by which blood coagulation was affected by the crystal structure of TiO2 thin films (thickness < 50 nm), including anatase, rutile, and mixed anatase/rutile. The films were characterized in terms of roughness using an atomic force microscope, thickness using an X-ray photoelectron spectrometer, and crystal structure using transmission electron microscopy. The surface energy and dielectric constant of the surface films were measured using a contact angle goniometer and the parallel plate method, respectively. Blood coagulation properties (including clotting time, factor XII contact activation, fibrinogen adsorption, fibrin attachment, and platelet adhesion) were then assessed on the various test specimens. Results: All of the TiO2 films were similar in terms of surface roughness, thickness, and surface energy (hydrophilicity); however, the presence of rutile structures was associated with a higher dielectric constant, which induced the activation of factor XII, the formation of fibrin network, and platelet adhesion. Conclusions: This study provides detailed information related to the effects of TiO2 crystal structures on blood coagulation properties on Ti implant surfaces.

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21

Tchoul, Maxim N., Scott P. Fillery, Hilmar Koerner, Lawrence F. Drummy, Folusho T. Oyerokun, Peter A. Mirau, Michael F. Durstock, and Richard A. Vaia. "Assemblies of Titanium Dioxide-Polystyrene Hybrid Nanoparticles for Dielectric Applications." Chemistry of Materials 22, no. 5 (March 9, 2010): 1749–59. http://dx.doi.org/10.1021/cm903182n.

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22

Peng, Zhanhui, Di Wu, Pengfei Liang, Jie Zhu, Xiaobin Zhou, Xiaolian Chao, and Zupei Yang. "Understanding the ultrahigh dielectric permittivity response in titanium dioxide ceramics." Ceramics International 46, no. 2 (February 2020): 2545–51. http://dx.doi.org/10.1016/j.ceramint.2019.09.109.

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23

Panfilov, D. A., V. M. Kuzminykh, R. S. Orekhov, N. A. Pavlov, I. M. Dvorko, and M. D. Rudakova. "Application of titanium dioxide as a filler to regulate the properties of epoxy-novolak foams." Plasticheskie massy 1, no. 5-6 (July 26, 2023): 22–26. http://dx.doi.org/10.35164/0554-2901-2023-5-6-22-26.

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Анотація:

The influence of titanium dioxide filler on the physical, mechanical and dielectric properties of epoxy-novolac foams of the PEN-I brand has been studied. The dependences of the apparent density, thermomechanical characteristics, and water absorption of structural foams depending on the filler content are analyzed. It is established that by introducing dispersed additives, it is possible to regulate the dielectric constant within specified limits and with high accuracy.

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24

C. Vella Durai, S., E. Kumar, and D. Muthuraj. "Investigations on structural, optical, and impedance spectroscopy studies of titanium dioxide nanoparticles." Bulletin of the Chemical Society of Ethiopia 35, no. 1 (May 7, 2021): 151–60. http://dx.doi.org/10.4314/bcse.v35i1.13.

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Анотація:

This article explains a novel synthesis for producing titanium dioxide (TiO2) nanoparticles by a sol-gel technique using titanium tetraisopropoxide as a titanium source. The synthesized nanoparticles were analyzed using many measurements like X-ray diffraction (XRD), HRTEM, absorption UV spectroscopy, FTIR, and ac impedance spectroscopy. X-ray peaks were used to calculate the crystallite size and lattice strain by Williamson–Hall method. Crystallite size calculated from x-ray diffraction using the Scherrer equation gives an approximate size and cannot be used for measurements. TiO2 nanoparticles are found to possess a tetragonal structure with a crystalline size around 12 nm. Particle size was confirmed by HRTEM images. The optical studies response for the nanoparticles showed the possible visible absorption peaks for TiO2 nanoparticles are 323 nm. Bandgap energy (Eg) of the TiO2 nanoparticle calculated from UV visible absorption spectra is discussed, and the bandgap is 3.14 eV. FTIR spectra showed vibration bands of the Ti-O network. AC Conductivity properties of TiO2 nanoparticles are studied in the frequency range 1 to 8 MHz at varying temperatures. The conductivity of the TiO2 nanoparticle is found to be constant in the low angular frequency region. Dielectric parameters were analyzed at different temperatures and frequencies. KEY WORDS: Conductivity, Dielectric, Nanoparticles, Titanium dioxide, Structural studies Bull. Chem. Soc. Ethiop. 2021, 35(1), 151-160. DOI: https://dx.doi.org/10.4314/bcse.v35i1.13

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25

Butt, M., E. Kozlova, and S. Khonina. "Conditions of a single-mode rib channel waveguide based on dielectric TiO2/SiO2." Computer Optics 41, no. 4 (2017): 494–98. http://dx.doi.org/10.18287/2412-6179-2016-40-4-494-498.

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Анотація:

In this paper, we propose conditions for the design of a single-mode rib channel waveguide based on dielectric materials such as titanium dioxide (TiO2) and silicon dioxide (SiO2) for the 0.633-µm visible light. We also design Y-splitter structures, which show high-degree optical confinement and low bend losses at various radii of curvatures. Small radii of curvatures are extremely desirable in integrated photonics as they permit decreasing the dimensions but can also potentially reduce power consumption in the active devices.

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26

Getmanov, A. G., and Tran Quyet Thang. "Dielectric Properties of Nanocomposites based on Epoxy Resins and Titanium Dioxide." International Journal of Circuits, Systems and Signal Processing 15 (September 13, 2021): 1400–1406. http://dx.doi.org/10.46300/9106.2021.15.150.

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In this work, polymer composite materials based on nanoparticles of titanium dioxide and epoxy polymer have been obtained. The dielectric properties of the obtained composite are investigated. Studies have shown that the introduction of TiO2 nanoparticles into an epoxy polymer leads not only to a slowdown in relaxation processes, but also increases the value of the through conduction. It was shown that the greatest influence of the introduction of nanoparticles on relaxation processes is observed on the α-relaxation

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27

Borilo, Lyudmila, Vladimir Kozik, Alexander Vorozhtsov, Viktor Klimenko, Olga Khalipova, Alexander Agafonov, Tatiana Kusova, Anton Kraev, and Yana Dubkova. "The Low-Temperature Sol-Gel Synthesis of Metal-Oxide Films on Polymer Substrates and the Determination of Their Optical and Dielectric Properties." Nanomaterials 12, no. 23 (December 6, 2022): 4333. http://dx.doi.org/10.3390/nano12234333.

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Анотація:

Photoactive, optically transparent heterostructures from silver nanowires and titanium dioxide were obtained by the sol-gel method on the surface of a polyethylene terephthalate film. The characteristics of optical transmission on the wavelength and those of dielectric permittivity, conductivity and dissipation on frequency in the range of 25–1,000,000 Hz were investigated.

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28

Manescu (Paltanea), Veronica, Gheorghe Paltanea, Iosif Vasile Nemoianu, Dorina Popovici, and Radu Mircea Ciuceanu. "Electrical Characterization of Titanium Dioxide Nanotubes Using Dielectric and Electrochemical Impedance Spectroscopy." Revista de Chimie 69, no. 12 (January 15, 2019): 3494–99. http://dx.doi.org/10.37358/rc.18.12.6777.

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The paper is devoted to the electrochemical anodizing method for TiO2 nanotube layers generation on titanium surface. It is commonly accepted that parameters like anodizing time, electrical voltage and the actual type of electrolyte are important factors in what concerns the TiO2 nanotube diameters and their surface density. The present study considers self-organized titanium nanotubes resulted from an aqueous solution of 49.5 wt% H2O, 49.5 wt% glycerol, 1 wt% HF used as the electrolyte. The actual anodizing duration was 8 hours at an applied voltage of 25 V. Through the technique of scanning electron microscopy, it is shown that the resulted tubular nanostructure is one-dimensional having an approximate inner and outer diameters of 90 nm and 110 nm, respectively. From an electrical point of view, the analysed materials properties were determined using electrochemical and dielectric impedance spectroscopy tests.

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29

Vasudevan, Prathibha, Sunil Thomas, K. V. Arunkumar, S. Karthika, and N. V. Unnikrishnan. "Synthesis and dielectric studies of poly (vinyl pyrrolidone) / titanium dioxide nanocomposites." IOP Conference Series: Materials Science and Engineering 73 (February 17, 2015): 012015. http://dx.doi.org/10.1088/1757-899x/73/1/012015.

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30

Karunagaran, B., S. J. Chung, E. K. Suh, and D. Mangalaraj. "Dielectric and transport properties of magnetron sputtered titanium dioxide thin films." Physica B: Condensed Matter 369, no. 1-4 (December 2005): 129–34. http://dx.doi.org/10.1016/j.physb.2005.08.006.

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31

Park, Hyun Ho, Youngeun Choi, Doo Jin Park, Se Youn Cho, Young Soo Yun, and Hyoung-Joon Jin. "Enhanced dielectric properties of electrospun titanium dioxide/polyvinylidene fluoride nanofibrous composites." Fibers and Polymers 14, no. 9 (September 2013): 1521–25. http://dx.doi.org/10.1007/s12221-013-1521-5.

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32

Huang, A. P., Paul K. Chu, L. Wang, W. Y. Cheung, J. B. Xu, and S. P. Wong. "Fabrication of rutile TiO2 thin films by low-temperature, bias-assisted cathodic arc deposition and their dielectric properties." Journal of Materials Research 21, no. 4 (April 1, 2006): 844–50. http://dx.doi.org/10.1557/jmr.2006.0119.

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The use of rutile-type titanium dioxide (TiO2) thin films as advanced gate dielectrics has been hampered by thermodynamic instability during the high deposition or annealing temperature of 800 °C. In this work, we demonstrate that rutile-type TiO2 thin films can be produced on p-type Si (100) at lower substrate temperature by means of bias-assisted cathodic arc deposition. The influence of the substrate bias on the microstructural and dielectric characteristics of the TiO2 thin films is investigated in detail. Our results show that by applying a suitable bias to the Si substrate, as-deposited rutile-type TiO2 thin films can be obtained at 450 °C. The permittivity of the materials increases significantly from 21 up to 76. The interfacial and electrical properties of TiO2/Si (100) are also improved. The effects and mechanism of the bias on the microstructural and dielectric characteristics are described.

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33

Kadhim, Asia Hussein, and Nahida B. Hasan. "Optical Constants of Fe2O3 and TiO2:Fe2O3 Thin Films Prepared by Spray Pyrolysis Technique." JOURNAL OF UNIVERSITY OF BABYLON for Pure and Applied Sciences 26, no. 10 (December 24, 2018): 224–32. http://dx.doi.org/10.29196/jubpas.v26i10.1874.

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"In the present work, optical constants have been studied for pure and titanium dioxide (TiO2) doped iron oxide (Fe2O3) thin films with different titanium dioxide dopant concentrations (1, 3 and 5 %) prepared by chemical spray pyrolysis technique on glass substrates. The optical properties of the films, which were prepared with a thickness of (260±10) nm, have been determined by using Shimadzu spectrophotometer, the optical transmittance measurements in the spectral region from (500- 1100) nm. Direct energy gap for (Fe2O3) equal (2.01) eV, it increases with increasing of TiO2%. The optical constants such as refractive index, extinction coefficient and dielectric constants have been calculated for all prepared films. The results show that all optical constants decrease with the increasing of dopant ratios."

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34

Berrag, Amine, Lakhdar Madani, and Saad Belkhiat. "An Experimental Study of the Dielectric Parameters of PVC Nano-Composites under Corona Conditions." Engineering, Technology & Applied Science Research 13, no. 2 (April 2, 2023): 10523–28. http://dx.doi.org/10.48084/etasr.5737.

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Poly-Vinyl Chloride (PVC) is a commonly used material used in cable insulation sheaths, but its dielectric properties can be negatively impacted by electric aging. This study investigates the use of nano-fillers, specifically alumina (Al2O3), titanium dioxide (TiO2), calcium carbonate (CaCO3), and barium titanate (BaTiO), in order to improve the dielectric properties of PVC. Films of PVC were doped with nano-fillers and were then exposed to an alternating voltage of 15kV for various time periods (1, 2, and 3 hours). The dielectric properties of PVC were measured using an impedance analyzer, and the results indicated that the use of these nano-fillers had a positive effect on the dielectric characteristics of PVC.

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35

Wolff, Karsten, Petri Heljo, and Donald Lupo. "Growth of Ultra-thin Titanium Dioxide Films by Complete Anodic Oxidation of Titanium Layers on Conductive Substrates." MRS Proceedings 1494 (2012): 159–64. http://dx.doi.org/10.1557/opl.2012.1580.

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ABSTRACTThe growth of thin and ultra-thin titanium dioxide layers was investigated. Oxide films were grown by galvanostatic and potentiodynamic anodisation of evaporated titanium layers on conductive substrates. It is shown that thin-film oxidation differs significantly from anodic oxidation of solid foils or plates, due to the sudden stop of anodisation process before complete oxidation of the thick films. Depending on the pH value and the potential sweep rate, the effective defect density and the dielectric constant of the anodized layers vary from 3·1019 cm-3 to 1020 cm-3and from 16 to 27, respectively, whereas the electrolyte temperature plays only a minor role.

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36

Gorelov, Borys M., Alla M. Gorb, Oleksiy I. Polovina, Sylwester Wacke, Zbigniew Czapla, Marek Kostrzewa, and Adam Ingram. "Filler's impact on structure and physical properties in polyester resin–oxide nanocomposites." Adsorption Science & Technology 36, no. 1-2 (May 31, 2017): 549–70. http://dx.doi.org/10.1177/0263617417706797.

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Impact of nanosized oxide particles of titania (titanium dioxide, rutile) and silica–titania fumed compound on structure relaxation processes in nanocomposites of an orthophtalic unsaturated styrene cross-linked polyester resin has been experimentally studied using the thermal desorption mass spectroscopy, the dielectric spectroscopy, and the positron annihilation lifetime spectroscopy. All the nanocomposites showed unmonotonous variations in the thermal resistance, the dielectric permittivity and losses, and the annihilation rates for both positrons and ortho-positronium atoms with increasing filler’s loading. The nanoparticle-loading effects can be explained on the assumption that the oxide particles embedded into a cross-linked polyester resin induce rearrangements in its structure. Several mechanisms of particle–polymer interface interaction compete simultaneously and thus promote the alterations in molecular structure of the nanocomposites. The mechanisms may include both chemical and electrostatic fastening of polyester chains and styrene cross-links to the active surface sites, the destruction of the styrene cross-links, and redistribution of electron density in polymers. The features of the loading effects observed in the different nanocomposites can be ascribed to distinctions in both of active surface sites and intrinsic dielectric properties of the filling oxide particles.

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37

Zhao, Chunlin, Zhenwei Li, and Jiagang Wu. "Role of trivalent acceptors and pentavalent donors in colossal permittivity of titanium dioxide ceramics." Journal of Materials Chemistry C 7, no. 14 (2019): 4235–43. http://dx.doi.org/10.1039/c9tc00578a.

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38

Chao, Sheng, and Fatih Dogan. "Effects of Manganese Doping on the Dielectric Properties of Titanium Dioxide Ceramics." Journal of the American Ceramic Society 94, no. 1 (September 3, 2010): 179–86. http://dx.doi.org/10.1111/j.1551-2916.2010.04039.x.

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39

Kumar, Arvind, Sandip Mondal, S. Girish Kumar, and K. S. R. Koteswara Rao. "High performance sol–gel spin-coated titanium dioxide dielectric based MOS structures." Materials Science in Semiconductor Processing 40 (December 2015): 77–83. http://dx.doi.org/10.1016/j.mssp.2015.06.073.

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40

Chen, Qianqian, Qirong Liu, Julie Hubert, Weide Huang, Kitty Baert, Gilles Wallaert, Herman Terryn, Marie-Paule Delplancke-Ogletree, and François Reniers. "Deposition of photocatalytic anatase titanium dioxide films by atmospheric dielectric barrier discharge." Surface and Coatings Technology 310 (January 2017): 173–79. http://dx.doi.org/10.1016/j.surfcoat.2016.12.077.

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41

Kumar, A., and S. Sarmah. "AC conductivity and dielectric spectroscopic studies of polypyrrole-titanium dioxide hybrid nanocomposites." physica status solidi (a) 208, no. 9 (June 16, 2011): 2203–10. http://dx.doi.org/10.1002/pssa.201026721.

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42

Vydianathan, Kanchana, Guillermo Nuesca, Gregory Peterson, Eric T. Eisenbraun, Alain E. Kaloyeros, John J. Sullivan, and Bin Han. "Metalorganic chemical vapor deposition of titanium oxide for microelectronics applications." Journal of Materials Research 16, no. 6 (June 2001): 1838–49. http://dx.doi.org/10.1557/jmr.2001.0253.

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A chemical vapor deposition process has been developed for titanium dioxide (TiOx) for applications as capacitor dielectric in sub-quarter-micron dynamic random-access memory devices, and as gate insulators in emerging generations of etal-oxide-semiconductor transistors. Studies using the β-diketonate source precursor (2,2,6,6-tetramethyl-3,5-heptanedionato) titanium were carried out to examine the underlying mechanisms that control film nucleation and growth kinetics and to establish the effects of key process parameters on film purity, composition, texture, morphology, and electrical properties. Resulting film properties were thoroughly analyzed by x-ray diffraction, x-ray photoelectron spectroscopy, Rutherford backscattering spectrometry, scanning electron microscopy (SEM), focused-ion-beam SEM, and capacitance–voltage (C–V) measurements. The study resulted in the identification of an optimized process for the deposition of an anatase–rutile TiOx film with a dielectric constant approximately 85 at 1 MHz for a 330-nm thickness, and a leakage current below 2 × 10−8 A/cm2 for bias voltage values up to 3.5 V.

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43

Hunagund, Shirajahammad M., Pradeep Chavan, Vani R. Desai, L. R. Naik, Jagadish S. Kadadevarmath, and Ashok H. Sidarai. "Influence of Fe³⁺ Ion Substitution on Thermal and Dielectric Properties of Titanium Dioxide." International Letters of Chemistry, Physics and Astronomy 67 (June 2016): 9–13. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.67.9.

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Thermal and dielectric characteristics of Fe2O3doped TiO2(FDT) nanopowder is investigated. Formation of FDT was prepared using the formula [1-x] TiO2+ [x] Fe2O3by solid state reaction method. The Surface morphology was studied using atomic force microscopy (AFM) technique; it reveals the average particle size in the range of 180 to 200nm. FT-IR analysis reveals weak transmittance bands between 1020 to 1650 cm-1and 2800 to 3500 cm-1which shows a gradual decrease in peak intensities with an increase of Fe concentration. Thermal stability was assessed by Thermogravimetric analysis (TGA). Results of TGA Profiles indicate that all FDT nanopowder was found to be thermally stable between 400 °C to 600 °C. The dielectric behavior of the said composite has been investigated as a function of frequency (20 Hz - 1 MHz) at room temperature and it is observed that the dielectric constant decreases with increasing frequency indicating dispersion behavior.

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44

Ruchkin S. E., ZhidikY. S., Yuryev Y. N., Runts A. A., Goncharova E. D., and Yuryeva A. V. "Study of optical and photocatalytic properties of titanium oxide films with different oxidation degree." Technical Physics Letters 48, no. 9 (2022): 30. http://dx.doi.org/10.21883/tpl.2022.09.55078.19150.

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The results of studies of the optical and photocatalytic properties of titanium oxide films deposited by vacuum-arc evaporation in an oxygen-containing atmosphere are presented. It was experimentally shown that films of different degrees of oxidation are formed during deposition, depending on the amount of oxygen flow entering the working chamber. The results of studies of the obtained films showed that the films obtained in a transitional mode between the deposition of metallic Ti films and dielectric TiO2 films have the maximum photocatalytic activity. This deposition mode is observed at the oxygen flow into the working chamber from 9 to 12 cm3/min Keywords: titanium dioxide, anatase, photocatalytic activity.

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45

MANGROLA, M. H., V. G. JOSHI, B. H. PARMAR, and A. S. PILLAI. "DIELECTRIC AND OPTICAL BEHAVIOR OF STRONTIUM DOPED TiO2 SYNTHESIZED BY SOLID STATE REACTION METHOD." International Journal of Modern Physics: Conference Series 22 (January 2013): 336–39. http://dx.doi.org/10.1142/s2010194513010325.

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In the present study, Strontium doped Titanium Dioxide (TiO2) were synthesized by standard solid-state reaction technique. The dielectric property of the synthesized samples has been studied in the present work. The dielectric constant and loss have been measured as a function of frequency (100 Hz-1 KHz) and temperature (50°C to 300°C). Strontium doped TiO2 shows interesting optical properties promising a variety of optical applications. Photoluminescence (PL) spectra was obtained at different excitation wavelength. PL emission spectra show that positions of PL peaks gradually shifts towards the violet region with increase of Sr ion dosage from 3% to 5%. The results are discussed in details.

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46

Ismail, Lyly Nyl, Nik Noor Hafizah Nik Mohamad, Muhamad Salleh Shamsudin, Habibah Zulkefle, Mohd Hanapiah Abdullah, Sukreen Hana Herman, and Mohamad Rusop. "Effect of Solvent on the Dielectric Properties of Nanocomposite Poly(methyl methacrylate)-Doped Titanium Dioxide Dielectric Films." Japanese Journal of Applied Physics 51, no. 6S (June 1, 2012): 06FG09. http://dx.doi.org/10.7567/jjap.51.06fg09.

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47

Ismail, Lyly Nyl, Nik Noor Hafizah Nik Mohamad, Muhamad Salleh Shamsudin, Habibah Zulkefle, Mohd Hanapiah Abdullah, Sukreen Hana Herman, and Mohamad Rusop. "Effect of Solvent on the Dielectric Properties of Nanocomposite Poly(methyl methacrylate)-Doped Titanium Dioxide Dielectric Films." Japanese Journal of Applied Physics 51 (June 20, 2012): 06FG09. http://dx.doi.org/10.1143/jjap.51.06fg09.

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48

Sami Abdali, Mohammed, Ahmed Shaker Hussein, and Mohammed Hadi Shinen. "Study the Effect of Thickness on Optical Properties of Titanium Dioxide (TiO2) That Preparation of Via the Sol-Gel Process." Journal of Kufa-Physics 12, no. 01 (December 10, 2020): 73–78. http://dx.doi.org/10.31257/2018/jkp/2020/120111.

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This research, study the effect of the thickness on titanium dioxide (TiO2) , that prepared by the Sol-Gel Process method on the optical properties of (TiO2) thin film with different thickness (54, 64 and 89 nm), the thickness effect on optical properties (energy gap , absorbance spectrum, transmittance spectrum, reflectance, refractive index, extinction coefficient, absorption coefficient, real and imaginary dielectric constant) ,this study shows that thickness have an effect on all these parameters .

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49

Raja, S., G. Koperundevi, and Muthusankar Eswaran. "Effect of Microwave Irradiation on the Dielectric Characteristics of Semi-Conductive Nanoparticle-Based Nanofluids: Progress towards the Microwave Synthesis." Micromachines 14, no. 6 (June 3, 2023): 1194. http://dx.doi.org/10.3390/mi14061194.

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Studies on dispersing nanoparticles in base fluid to elevate its essential and critical properties have evolved significantly in the recent decade. Alongside the conventional dispersion techniques used for nanofluid synthesis, microwave energy at 2.4 GHz frequency is irradiated onto the nanofluids is experimented with in this study. The effect of microwave irradiation on the electrical and thermal properties of semi-conductive nanofluids (SNF) is investigated and presented in this article. Titanium dioxide and zinc oxide are the semi-conductive nanoparticles used for this study to synthesize the SNF, viz., titania nanofluid (TNF) and zinc nanofluid (ZNF). Flash and fire points are the thermal properties verified, and dielectric breakdown strength, dielectric constant (εr), and dielectric dissipation factor (tan δ) are the electrical properties verified in this study. AC breakdown voltage (BDV) of TNF and ZNF is improved by 16.78% and 11.25%, respectively, more than SNFs prepared without microwave irradiation. Results justify that the synergetic effect of stirring, sonication, and microwave irradiation in a rational sequence (microwave synthesis) exhibited better electrical and unaltered thermal properties. This microwave-applied nanofluid synthesis could be a simple and effective route to prepare the SNF with improved electrical properties.

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50

Devlin, Robert C., Mohammadreza Khorasaninejad, Wei Ting Chen, Jaewon Oh, and Federico Capasso. "Broadband high-efficiency dielectric metasurfaces for the visible spectrum." Proceedings of the National Academy of Sciences 113, no. 38 (September 6, 2016): 10473–78. http://dx.doi.org/10.1073/pnas.1611740113.

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Metasurfaces are planar optical elements that hold promise for overcoming the limitations of refractive and conventional diffractive optics. Original dielectric metasurfaces are limited to transparency windows at infrared wavelengths because of significant optical absorption and loss at visible wavelengths. Thus, it is critical that new materials and nanofabrication techniques be developed to extend dielectric metasurfaces across the visible spectrum and to enable applications such as high numerical aperture lenses, color holograms, and wearable optics. Here, we demonstrate high performance dielectric metasurfaces in the form of holograms for red, green, and blue wavelengths with record absolute efficiency (>78%). We use atomic layer deposition of amorphous titanium dioxide with surface roughness less than 1 nm and negligible optical loss. We use a process for fabricating dielectric metasurfaces that allows us to produce anisotropic, subwavelength-spaced dielectric nanostructures with shape birefringence. This process is capable of realizing any high-efficiency metasurface optical element, e.g., metalenses and axicons.

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