Mechanisms of enhanced performance in Zr/Ta codoped rutile-TiO ceramics via broadband dielectric spectroscopy.

Aliovalent dopant codoped rutile-TiO materials have garnered attention due to their excellent performance properties, characterized by low loss tangent (tanδ), high dielectric permittivity (ε'), and stable ε' over a broad temperature range. This performance is primarily due to the electron-pinned defect-dipoles (EPDDs) of the complex defects [Formula: see text]Ti-[Formula: see text]TiB. Notably, the excellent dielectric properties in ZrTaTiO (Zr-TTO) ceramics can be achieved using the traditional mixed oxide method without the EPDDs, due to the absence of A (acceptor doping ions).

Chromium (VI) removal by magnetite nanoparticles immobilized with extracellular polymeric substances extracted from Lysinibacillus sp. WH.

Magnetite nanoparticles (nano-FeO) and nano-FeO immobilized with bacterial extracellular polymeric substances (EPSs) extracted from Lysinibacillus sp. WH (FeO/bact) were comparatively studied for the removal of Cr (VI) ions from aqueous solution in batch study. The objectives were to explore the removal of Cr (VI) efficiency by nano-FeO and FeO/bact under varying bacterial concentrations at a range of acidic pH.

Enhanced humidity sensing properties of TaO and ITO doped rutile-TiO porous ceramics.

In this study, we investigated the humidity sensing properties of TiO-based ceramics doped with tantalum pentoxide (TaO) and indium tin oxide (ITO). Pure TiO, 1%Ta-doped TiO (1%TTO), 1%ITO-doped TiO (1%ISTO), and 1%(TaO + ITO) co-doped TiO (1%ISTTO) ceramic samples were obtained by sintering at 1200 °C for 3 h. The rutile phase was observed in all samples.

Advanced humidity sensing properties of CuO ceramics.

This research explores the capacitive humidity sensing properties of CuO ceramic, selected for its simplicity as an oxide and ease of fabrication, in addition to its remarkable dielectric properties. The CuO sample was fabricated by sintering at 980 °C for 5 h. A microstructure with a relative density of 88.

Photoinduced charge generation of nanostructured carbon derived from human hair biowaste for performance enhancement in polyvinylidene fluoride based triboelectric nanogenerator.

Carbon nanostructures derived from human hair biowaste are incorporated into polyvinylidene fluoride (PVDF) polymer to enhance the energy conversion performance of a triboelectric nanogenerator (TENG). The PVDF filled with activated carbon nanomaterial from human hair (AC-HH) exhibits improved surface charge density and photoinduced charge generation. These remarkable properties are attributed to the presence of graphene-like nanostructures in AC-HH, contributing to the augmented performance of PVDF@AC-HH TENG.

Pioneering dielectric materials of Sn-doped NbTiO ceramics with excellent temperature and humidity stability for advanced ceramic capacitors.

In this study, the rutile TiO system, widely acclaimed for its superior properties, was enhanced through co-doping with isovalent Sn ions and 2.5% Nb donor ions, diverging from traditional acceptor doping practices. This novel doping strategy was implemented by employing a conventional solid-state reaction method, resulting in the synthesis of Sn-doped NbTiO (Sn-NTO) ceramics.

Enhanced dielectric properties of PVDF polymer nanocomposites: A study on gold-decorated, surface-modified multiwalled carbon nanotubes.

The integration of surface-modified multiwalled carbon nanotubes (MWCNTs) into polymer nanocomposites has been extensively studied for their potential to enhance dielectric properties. This study, however, pioneers the use of a novel hybrid filler comprising MWCNTs coated with metal nanoparticles, specifically aimed at augmenting the dielectric performance of polymers. In our research, poly(vinylidene fluoride) (PVDF) nanocomposite films were synthesized using MWCNTs with a diameter of ∼6-9 nm and a length of 5 μm, adorned with gold nanoparticles (Au) of ∼5.

Tuning enhanced dielectric properties of (Sc-Ta) substituted TiO via insulating surface layers.

In this study, we achieved significantly enhanced giant dielectric properties (EG-DPs) in Sc-Ta co-doped rutile-TiO (STTO) ceramics with a low loss tangent (tanδ ≈ 0.05) and high dielectric permittivity (ε' ≈ 2.4 × 10 at 1 kHz).

The Modification of Activated Carbon for the Performance Enhancement of a Natural-Rubber-Based Triboelectric Nanogenerator.

Increasing energy demands and growing environmental concerns regarding the consumption of fossil fuels are important motivations for the development of clean and sustainable energy sources. A triboelectric nanogenerator (TENG) is a promising energy technology that harnesses mechanical energy from the ambient environment by converting it into electrical energy. In this work, the enhancement of the energy conversion performance of a natural rubber (NR)-based TENG has been proposed by using modified activated carbon (AC).

DFT calculations and giant dielectric responses in (NiNb)TiO.

The origins of dielectric responses in Ni and Nb co-doped TiO were explored considering intrinsic and extrinsic effects. DFT calculations demonstrated that Ni doping induced oxygen vacancies, while Nb doping generated free electrons. Theoretical predictions indicated complex defect dipoles forming in the rutile structure, contributing to overall dielectric responses.

Giant dielectric response, nonlinear characteristics, and humidity sensing properties of a novel perovskite: NaSrTbCuTiO.

In this study, we unveil a novel perovskite compound, NaSrTbCuTiO, synthesized through a solid-state reaction method, exhibiting remarkable giant dielectric response, nonlinear characteristics, and humidity sensing capabilities. This research highlights the emergence of a Cu-rich phase, the properties of which undergo significant alterations depending on the sintering conditions. The optimization of sintering parameters, encompassing a temperature range of 1040-1450 °C for 1-8 h, resulted in substantial dielectric permittivity (') values (∼2800-6000).

Significantly improved giant dielectric properties and enhanced nonlinear coefficient of Ni doped CaCuTiO/CaTiO composites.

CaCuNiTiO/CaTiO ceramic composites were fabricated using initial CaCuNiTiO compositions ( = 0, 0.05, 0.10, and 0.

Computational and experimental investigations of the giant dielectric property of NaYCuTiO ceramics.

A modified sol-gel method was used to successfully produce NaYCuTiO ceramics with high dielectric permittivity. The dielectric permittivity of NaYCuTiO ceramics reaches values larger than 10 at room temperature and 1 kHz. Moreover, these ceramics exhibit two distinct thermally induced dielectric relaxations over a broad temperature range.

Extremely reduced loss tangent with retaining ultra high dielectric permittivity in Mg-doped LaSrNiO ceramics.

An extremely reduced loss tangent while retaining ultrahigh dielectric permittivity can be successfully obtained in LaSrNiO ceramics by doping with Mg ions. A single phase of LaSrNiO was detected in all the sintered ceramics, while the lattice parameters increased with increasing doping concentration, indicating that Mg ions can enter the Ni sites. A highly dense microstructure is achieved.

Effects of sintering condition on giant dielectric and nonlinear current-voltage properties of NaYCuTiTaO ceramics.

The effects of sintering conditions on the microstructure, giant dielectric response, and electrical properties of NaYCuTiTaO (NYCTTaO) were studied. A single phase of NaYCuTiO and a high density (>98.5%) were obtained in the sintered NYCTTaO ceramics.

Engineering Triboelectric Charge in Natural Rubber-Ag Nanocomposite for Enhancing Electrical Output of a Triboelectric Nanogenerator.

An environmentally friendly triboelectric nanogenerator (TENG) is fabricated from a natural rubber (NR)-Ag nanocomposite for harvesting mechanical energy from human motions. Ag nanoparticles (AgNPs) synthesized with two different capping agents are added to NR polymer for improving dielectric constant that contributes to the enhancement of TENG performance. Dielectric constant is modulated interfacial polarization between AgNPs and NR matrix.

Improved Thermoelectric Properties of SrTiO via (La, Dy and N) Co-Doping: DFT Approach.

This work considers the enhancement of the thermoelectric figure of merit, ZT, of SrTiO (STO) semiconductors by (La, Dy and N) co-doping. We have focused on SrTiO because it is a semiconductor with a high Seebeck coefficient compared to that of metals. It is expected that SrTiO can provide a high power factor, because the capability of converting heat into electricity is proportional to the Seebeck coefficient squared.

Giant Dielectric Properties of W-Doped TiO Ceramics.

The effects of the sintering temperature and doping level concentration on the microstructures, dielectric response, and electrical properties of W-doped TiO (WTO) prepared via a solid-state reaction method were investigated. A highly dense microstructure, pure rutile-TiO, and homogenously dispersed dopant elements were observed in all of the ceramic samples. The mean grain size increased as the doping concentration and sintering temperature increased.

Dielectric Responses of (ZnNb)TiO Ceramics Prepared by Chemical Combustion Process: DFT and Experimental Approaches.

The (Zn, Nb)-codoped TiO (called ZNTO) nanopowder was successfully synthesized by a simple combustion process and then the ceramic from it was sintered with a highly dense microstructure. The doped atoms were consistently distributed, and the existence of oxygen vacancies was verified by a Raman spectrum. It was found that the ZNTO ceramic was a result of thermally activated giant dielectric relaxation, and the outer surface layer had a slight effect on the dielectric properties.

Effects of Sintering Conditions on Giant Dielectric and Nonlinear Current-Voltage Properties of TiO-Excessive NaYCuTiO Ceramics.

The effects of the sintering conditions on the phase compositions, microstructure, electrical properties, and dielectric responses of TiO-excessive NaYCuTiO ceramics prepared by a solid-state reaction method were investigated. A pure phase of the NaYCuTiO ceramic was achieved in all sintered ceramics. The mean grain size slightly increased with increasing sintering time (from 1 to 15 h after sintering at 1070 °C) and sintering temperature from 1070 to 1090 °C for 5 h.

Effect of hydrogen on magnetic properties in MgO studied by first-principles calculations and experiments.

We investigated the effects of both intrinsic defects and hydrogen atom impurities on the magnetic properties of MgO samples. MgO in its pure defect-free state is known to be a nonmagnetic semiconductor. We employed density-functional theory and the Heyd-Scuseria-Ernzerhof (HSE) density functional.

Enhanced dielectric properties with a significantly reduced loss tangent in (Mg, Al) co-doped CaCuTiO ceramics: DFT and experimental investigations.

CaCuTiO and CaCuMgTiAlO ceramics were fabricated a solid-state reaction method. A single-phase of CaCuTiO was found in these two ceramics. Very great grain size expansion was produced by co-doping with Mg and Al.

Colossal dielectric permittivity, reduced loss tangent and the microstructure of Ca Cd CuTiO F ceramics.

Ca Cd CuTiO F ( = = 0, 0.10, and 0.15) ceramics were successfully prepared a conventional solid-state reaction (SSR) method.

Improved microstructure and significantly enhanced dielectric properties of Al/Cr/Ta triple-doped TiO ceramics by Re-balancing charge compensation.

The charge compensation mechanism and dielectric properties of the (Al Cr )TaTiO ceramics were studied. The mean grain size slightly changed with the increase in the Al/Cr ratio, while the porosity was significantly reduced. The dielectric permittivity of the co-doped CrTaTiO ceramic was as low as '∼ 10, which was described by self-charge compensation between Cr-Ta, suppressing the formation of Ti.

Mechanical and Dielectric Properties of Fly Ash Geopolymer/Sugarcane Bagasse Ash Composites.

Fly ash (FA) and sugarcane bagasse ash (SCBA) are the wastes from lignite power plants and sugar industries, usually disposed of as landfills. In this research, these wastes were effectively utilized as a construction material, namely geopolymer. The effect of the SCBA (0-40 wt.