BaTiO3 Content Research Articles

Detection of deformation induced electromagnetic radiation from cement- barium titanate composite under impact loading

Electromagnetic radiation (EMR) responses from cement–BaTiO3 (BT) composites under impact loading have been presented in this paper. The bulk density, dielectric constant and piezoelectric charge coefficient of the cement-BT composites are observed to increase while the loss tangent decreases with increase in BT content in the composites. Measurements have been carried out using cylindrical, semi-cylindrical and quarter cylindrical antennae. Marked enhancement in the values of EMR voltage for all experiments at different heights of impact and with different antennae is observed as the content of BT is increased from 5% to 40% in the cement–BT composites. The EMR voltage increases, respectively from 0.58 V to 1.16 V, 384–732 mV and 259–520 mV for cylindrical antenna, semi-cylindrical antenna and quarter cylindrical antenna with the increase in BT content from 5% to 40% in cement–BT composites at the same level of impact (height of impact = 21 cm). Also average EMR energy release rate increases from 0.00007 V2–sec/sec to 0.00047 V2–sec/sec, 0.000065 V2 – sec/sec to 0.000214 V2 – sec/sec and 0.000032 V2 – sec/sec to 0.000135 V2 – sec/sec with the increase in BT content from 5% to 40% in cement–BT composites impacted from a height of 21 cm as measured by cylindrical antenna, semi-cylindrical antenna and quarter cylindrical antenna respectively. The EMR voltage is observed to decrease smoothly initially and then attain constancy with increase in distance of measurement location from the sample. In addition, the EMR responses were found to be proportional to the height of impact in all the cement–BT composites indicating that EMR measurement technique can effectively be used for structural health monitoring.

Properties of (1-x)NaCu3Ti3NbO12-(x)BaTiO3 ceramics with various sintering temperatures prepared by conventional solid-state reaction method

ABSTRACTIn the research, the properties of sodium copper titanate niobate – barium titanate [(1-x)NaCu3Ti3NbO12-(x)BaTiO3: (1-x)NCTNO-(x)BT] ceramics prepared by conventional solid-state reaction method with various molecular weight of BT or x between 0.1, 0.3 and 0.5 were investigated. These ceramics were sintered at 975, 1000, 1025 and 1050 oC for 10 h in ambient atmosphere. The phase structure, microstructure, density, micro-hardness and dielectric properties were examined by x-ray diffraction technique (XRD), scanning electron microscopy (SEM), Archimedes method, Vickers micro-hardness tester and impedance analyzer, respectively. It was found that, the addition of BaTiO3 resulted in the formation of second phase which increased upon increasing the BaTiO3 content. Compared to the base composition, the grain sizes of all the (1-x)NCTNO-(x)BT were significantly reduced. The densities of (1-x)NCTNO-(x)BT ceramics and dielectric properties were improved with the addition of BaTiO3. For the effect of sintering temperatures, no substantial change in the crystal structure and grain growth was found whereas an increase in densities and hardness with increasing temperatures were observed. The (0.7)NCTNO-(0.3)BT ceramics sintered at 1025 oC showed the highest density and dielectric constant (∼80500) at room temperature with 1 kHz measurement.

Secondary dispersion of BaTiO3 for the enhanced mechanical properties of the Poly (arylene ether nitrile)-based composite laminates

Secondary dispersion of the nano barium titanate (BaTiO3) was performed to obtain the fiber-reinforced polyarylene ether nitrile-based (PEN) composite laminates with improved mechanical properties. BaTiO3/PEN composite films were prepared via casting with ultrasonic dispersion, and then the glass fiber-reinforced (GF) composite laminates were obtained by the hot-melting method, which were favored to realize the secondary dispersion of the BaTiO3 nanoparticles. The fracture surface of the BaTiO3/PEN films and BaTiO3/PEN/GF composite laminates investigated by SEM showed that the BaTiO3 dispersed homogenously both in the PEN matrix and the gaps between the fibers. The mechanical and thermo-mechanical properties of the laminates were characterized and results indicated that the nano-BaTiO3 particles and fibers show enhanced synergistic effects. That is, with increasing the BaTiO3 content, the flexural strength and modulus of the composite laminates increased correspondingly, as well as the glass transition temperatures. Additionally, with the introduction of nano-BaTiO3 particles, the dielectric constants (>5.5 at 1 kHz) of the composite laminates were improved obviously and the low dielectric loss (˂0.02 at 1 kHz) was maintained. The temperatures at weight loss 5% (T5%) of all the composite laminates with various content of BaTiO3 were over 490 °C both in N2 and air atomosphere. Good dielectric properties and outstanding thermo-mechanical properties would enable the PEN-based fiber-reinforced composite laminates as the candidates in the material fields of structure-functional integrations.

Impedance spectroscopic study on microwave sintered (1 − x) Na0.5Bi0.5TiO3–x BaTiO3 ceramics

Complex impedance spectroscopic technique has been implemented to study the detailed electrical transport properties of Lead free ferroelectric ceramic solid solutions of (1 − x) Na0.5Bi0.5TiO3–x BaTiO3 (NBT–BT) (0.00 ≤ x ≤ 0.10). The NBT–BT ceramics have been synthesized by sol–gel auto combustion method and sintered via microwave sintering technique. Room temperature X-ray diffraction patterns confirmed the formation of the single phase materials with perovskite structure. The surface morphology of the samples has been studied using field emission scanning electron microscopic (FESEM) technique. The FESEM micrographs confirm that the grain size decreases with increasing BaTiO3 (BT) concentration. Complex impedance, complex electric modulus formalism, and frequency dependent ac conductivity analysis have been used to study the relaxation and conduction mechanism in these materials. The presence of grain- and grain boundary contribution to impedance spectra in NBT–BT ceramics were analyzed using complex impedance plot in association with complex modulus plot. The grain- and grain boundary contributions were discerned in NBT–BT ceramic through least-squares fitting of the experimental data with a suitable equivalent circuit model. Complex impedance and complex electric modulus spectroscopic analysis indicate that the dielectric relaxation in these materials are of non-Debye type. A negative temperature coefficient of resistance (NTCR) behavior of our NBT–BT ceramics was seen from the temperature dependent conductivity studies. We have obtained similar activation energies from the conduction and relaxation process.

The effect of BaTiO3 addition on the dielectric constant of Si3N4 ceramics

AbstractSi3N4 ceramics with different BaTiO3 contents have been fabricated by pressureless sintering in a N2 atmosphere at 1680°C for 2 h. Al2O3 and Nd2O3 were used as sintering additives to promote the densification of Si3N4 ceramics. The effect of BaTiO3 addition on the densification, mechanical properties, phase compositions, microstructure, and dielectric properties of Si3N4 ceramics was investigated. The relative density and flexural strength of Si3N4 ceramics increased with the addition of BaTiO3 up to 15 wt% and then decreased, while the dielectric constant increased continuously as the BaTiO3 contents increased. The dielectric constant of Si3N4 ceramics can be tailored in the range from 8.42 to 12.96 by the addition of 5 wt%‐20 wt% BaTiO3. Meanwhile, these Si3N4 ceramics all had flexural strength higher than 500 MPa.

The Influence of High-Dispersed Barium Titanate, in Films With Addition of, and Based on Poly(Vinylidene) Fluoride), on Structure and Electrophysical Properties of Ones

With the aim of the creation of effective electret materials, the composite films, based on poly(vinylidene fluoride) (PVF), in addition with segnetoelectric of barium titanate (BaTiO3) were obtained in the concentration range of 0.5 – 5.0 %vol. There are PVF’s melting temperature range becomes narrower, when at 0.5 – 1.0 % vol. of, and, this pointing on more homogeneous crystallite formation by dimensions in. When at high content (5.0 % vol.) of BaTiO3, there is a decrease of crystallization temperature observed (at 5 ºC), and then, there is temperature range broadening exists, and this pointing on forming of larger, but less homogeneous crystallites by dimensions in. It is determined, when composite films of PVF - BaTiO3 , that surface charge is more stable at BaTiO3 content of 4.0 %vol. in, and then, one reaches a value of 10-6 Cl/m2, when at conditions of treatment with electric field and crown discharge, and, at film charge value of 500 kV/m in. There are non-linear dependence of dielectric permittivity exists, either when at low, or very high frequencies, and this may be linked with the influence of high-disperse addition on polymers crystalline structure formation, and sub-surface layers of one.

Facile synthesis and enhanced microwave absorption properties of multiferroic Ni0.4Co0.2Zn0.4Fe2O4/BaTiO3 composite fibers

Multiferroic composite fibers composed of Ni0.4Co0.2Zn0.4Fe2O4 (NCZFO) spinel ferrite and BaTiO3 (BTO) have been successfully synthesized by a simple electrospinning and subsequent heat treatment. The effects of the BTO content on the structure, static magnetic performance, electromagnetic and microwave absorption properties of the as-prepared samples are thoroughly investigated. The electromagnetic parameters and microwave absorption performances can be readily and effectively tuned through controlling the molar ratio of the two phases. The sample of NCZFO/(40 mol%)BTO fibers shows the enhanced complex permittivity making it better in microwave absorption capability than the composite fibers with other compositions and the mixture of NCZFO fibers and BTO fibers. The microwave absorption values less than −10 dB can cover the entire 2–18 GHz frequency range over the absorber thickness of 2–7.5 mm, and the minimum reflection loss value reaches −65.6 dB at 15.7 GHz with a broad effective absorption bandwidth below −10 dB of 7.8 GHz ranging from 2.6 to 6.8 GHz and 13.7 to 17.3 GHz for a layer thickness of 5 mm. The enhanced absorbing ability for the optimal NCZFO/(40 mol%)BTO fibers arises from the good synergistic effect between magnetic and dielectric components within the quasi-one-dimensional space, the improved interfacial effect as well as the proper electromagnetic impedance matching.

Structural and electrical characteristics of potential candidate lead-free BiFeO3-BaTiO3 piezoelectric ceramics

The crystal structures and electrical properties of lead-free BiFeO3-BaTiO3 [(1-x)BFxBT] piezoelectric system are investigated as a function of BaTiO3 concentration. The well-saturated P-E hysteresis loop was observed in the 0.80BiFeO3–0.20BaTiO3 composition system, while a less hysteretic strain-electric field curve was exhibited by the 0.70BiFeO3–0.30BaTiO3 with a strain hysteresis of 16%, the value comparable to PZT-based piezoelectric ceramics. The crystal structures investigated under the synchrotron radiation X-ray diffraction exhibited a rhombohedral structure for BFBT system with x = 0.10–0.25 and a pseudo-cubic structure for BFBT system with x = 0.30–0.40. The structural phase diagram for the BiFeO3-BaTiO3 system is suggested based on the results of temperature-dependent synchrotron radiation X-ray diffraction measurement and investigated electrical properties.

Multiscale identification of local tetragonal distortion in NaNbO3-BaTiO3 weak relaxor ferroelectrics by Raman, synchrotron x-ray diffraction, and absorption spectra

Locally persistent tetragonal distortion in NaNbO3-BaTiO3 relaxor ferroelectrics was identified at multiple length scales by means of in-situ synchrotron x-ray diffraction, absorption fine structure, and Raman spectra although their average symmetry seemingly evolved from a tetragonal to a cubic-like phase with the increasing BaTiO3 content. Theoretical calculations of Nb-O peaks in the R range of 1–2 Å provided a clear evidence that Nb5+ in an NbO6 octahedron should be spontaneously shifted along [001]. The competition between B-site Nb5+ ([001]) and Ti4+ ([111]) spontaneous off-center displacement directions would contribute to the disruption of long-range polar ordering. Raman spectra suggested that A-site Ba2+ and Na+ cations should be located at the center of the cubes in the absence of the polar contribution unlike Pb2+/Bi3+ with lone-pairs. A relatively low field-induced strain in NN-BT relaxors was thus ascribed to the small spontaneous polarization magnitude and the absence of structural phase transition during electric loading.

TiO2-BaTiO3 Composite Films as Photoanode for Dye Sensitized Solar Cell: Effect of BaTiO3 Content

This manuscript reports the use of TiO2-BaTiO3 composite films as a photoanode in dye-sensitized solar cell (DSSC). The influence of BaTiO3 content on the performance parameters of the DSSC has been investigated. The composite has been prepared on ITO glass substrate via sol-gel assisted with spin coating technique. The XRD analysis reveals that the sample is crystalline with the phase of BaTiO3 and anatase TiO2. From the FESEM observation, it was found that the pure sample contains bigger pores compared with the other samples prepared with various BaTiO3 contents. The samples become more compact as the content of BaTiO3 increases. The samples absorb more light in ultraviolet (UV) region than visible region. The area of absorption window varies with BaTiO3 content. The device utilizing the sample with 0 and 6 wt.% BaTiO3 demonstrated the lowest leak current. The device utilizing pure sample produced the highest η of 0.18%. This is due to this device utilized the sample with highest porosity, lowest leak current and charge transfer resistance, Rct.

Effect of BaTiO3 concentration on structural and magnetic properties of mechanically activated BiFeO3-BaTiO3 system

Abstract In this research, the mechanical activation method is proposed as an alternative process of preparation of the (BiFeO3)1-x-(BaTiO3)x solid solutions with various concentrations of barium titanate (x = 0.1÷0.9). However, mechanical milling itself does not allow obtaining the desired products and additional thermal treatment is needed to complete the solid-state reaction. In the present studies, X-ray diffraction and 57Fe Mössbauer spectroscopy were applied as complementary methods in order to study the structural and magnetic properties of materials. The investigations revealed that an increase of BaTiO3 concentration causes changes in the crystalline and hyperfine magnetic structure of the studied (BiFeO3)1-x-(BaTiO3)x system.

Crystallization kinetics and enhanced dielectric properties of free standing lead-free PVDF based composite films

Ferroelectric composites, integrating dielectric ceramic fillers with mechanically flexible polymers, are promising materials for flexible electronic applications. Plenty of research has demonstrated the enhanced dielectric and ferroelectric properties of composite materials. However, the mechanisms responsible for these enhancements are not completely understood. Herein, we used typical dielectric materials, poly(vinylidene fluoride) (PVDF) and BaTiO3 (BTO), to study the effect of a dielectric filler on the crystallization, phase transformation and dielectric properties of PVDF. The crystallization of β-PVDF was not affected by the presence of BTO particles, but small amounts of BTO (< 3 vol %) made PVDF crystallize into larger spherulites. This is linked to crystallization kinetic studies, which showed that BTO acted as a nucleation agent for large full ring banded spherulites when its content was less than 1 vol %. Furthermore, solid state drawing in the presence of BTO particles promoted the formation of β-PVDF with more pronounced preferred crystalline orientation at high drawing temperatures (120 °C). The dielectric and ferroelectric properties were enhanced with BTO filling. The 100 °C oriented drawn PVDF tape exhibited a dielectric permittivity of 14 (100 Hz) and remnant polarization of 0.080 C/m2 (10 Hz), which increased to 23 and 0.095 C/m2, respectively, after filling with 5 vol % BTO; neither resulting in high dielectric loss tangent (∼ 0.02) nor obvious current leakage. Moreover, the coercive field decreased from 80 to 50 kV/mm with increasing BTO content from 0 to 5 vol %.

Effects of BaTiO3 doped on structural and dielectric properties of Bi0.5(Na0.80K0.20)0.5TiO3 ceramic

ABSTRACTWe studied the effects of BaTiO3 (BT) seed nano-crystals on dielectric properties and phase transition behavior of Bi0.5(Na0.8K0.2)0.5TiO3 (BNKT) ceramics. The BaTiO3 seed nano-crystals were used as nuclei, which acted as templates for starting materials to form perovskite phase. In this study, the BT seed nano-crystals were prepared by the molten salt technique. Eutectic mixtures of NaCl-KCl (1:1 by mole) were used as the flux. Various concentrations of BT seed nano-crystals were mixed with other precursors required for formation of BNKT phase, which was prepared by the solid-state method. Addition of BT seed nano-crystals enhanced the electrical properties of ceramics. The sample with 8 mol% BT seed nano- crystals exhibited highest value of dielectric constant (ϵr) at maximum temperature of 6700. The grain size significantly decreased with increasing concentration of BT seed nano-crystals. The relaxor ferroelectric behavior was also observed with the diffuseness parameter (γ) value being close to 2.

Uniaxial compressive stress and temperature dependent mechanical behavior of (1- x )BiFeO 3 - x BaTiO 3 lead-free piezoelectric ceramics

The mechanical behavior of polycrystalline lead-free (1-x)BiFeO3-xBaTiO3 (BF-BT) piezoelectric ceramics was investigated under uniaxial compressive stress from room temperature up to 400 °C with macroscopic stress-strain measurements and in situ stress-dependent neutron diffraction. Stress-strain curves revealed a changing mechanical response with BaTiO3 content and temperature. With decreasing BaTiO3 content there was an increase in the coercive stress, which reduced the remanent strain and hysteresis. Full pattern structural refinement of the neutron data reveals both rhombohedral distortion and magnetic moment decreases with increasing BaTiO3 content. In situ stress-dependent neutron diffraction experiments showed that accommodation of external stress occurs through the changes in tilt magnitude and anisotropy of oxygen octahedra at room temperature. The origin of stress-induced strain at room temperature is a lattice deformation without any apparent change in average crystallographic symmetry or domain switching. Temperature-dependent in situ stress-induced measurement of BF-30BT showed maximum strain close to the rhombohedral - pseudocubic transition temperature, which has been proposed to be due to the lattice deformation as well as to the differing degree of tilting of the (Fe/Ti)O6 octahedra.

Charge correlation of ferroelectric and piezoelectric properties of (1 − x)(Na0.5Bi0.5)TiO3–xBaTiO3 lead-free ceramic solid solution

Single phased lead-free (1 − x)(Na0.5Bi0.5)TiO3–xBaTiO3 (x = 0.00, 0.04, 0.08 and 0.12) ((1 − x)NBT–xBT) ceramics were synthesized by the solid-state reaction method. The powder X-ray diffraction patterns and profile refinements revealed that, for 0.04 < x < 0.08, the prepared ceramics have been crystallized in morphotropic phase boundary between rhombohedral to tetragonal structures. The charge distribution and bonding behaviour in (1 − x)NBT–xBT unit cell were completely analyzed through charge density distribution studies. UV–visible analysis reveals that, the optical band gap energy of the solid solution increases with addition of BaTiO3 content. The surface morphology and elemental compositions for the sintered powders were analyzed through scanning electron microscopy and energy dispersive X-ray studies. Electrical measurements on the solid solutions showed that the maximum values of the dielectric constant, the remnant polarization and the piezoelectric coefficient are reached at near (x = 0.08) the morphotropic phase boundary (e = 4070 at 100 kHz; Pr = 18.92 µC/cm2; d33 = 122 pC/N). Thus, the (1 − x)NBT–xBT system is expected to be a promising candidate for lead-free piezoelectric material.

Roles of carbon nanotube and BaTiO3 nanofiber in the electrical, dielectric and piezoelectric properties of flexible nanocomposite generators

We report the electrical, dielectric and piezoelectric properties of flexible PDMS-based nanocomposite generators, which are tunable by different contents of multi-walled carbon nanotube (MWCNT, 0.0–5.0 wt%) and BaTiO3 nanofiber (10–50 wt%). The BaTiO3 nanofiber with tetragonal structure was manufactured by an electrospinning and following calcination process. For the first series of nanocomposite generators with 30 wt% BaTiO3 nanofiber and 0.0–5.0 wt% MWCNT, both electrical and dielectric properties were dramatically enhanced at a critical MWCNT content of 0.47 wt% owing to the formation of percolating networks of MWCNT in the presence of BaTiO3 nanofibers, as verified by SEM analysis. Accordingly, the nanocomposite generator with 30 wt% BaTiO3 and 5.0 wt% MWCNT achieved the highest conductivity of 0.12 S/cm and dielectric constant of 4474 at 1 kHz, whereas the nanocomposite generator with 30 wt% BaTiO3 and 2.0 wt% MWCNT attained the best piezoelectric performance by harvesting average output voltage of ∼3.00 V, current of ∼0.82 μA, and power of ∼0.14 μW. In cases of the second series of nanocomposite generators with 2.0 wt% MWCNT and 10–50 wt% BaTiO3 nanofiber, the electrical conductivity and dielectric constant increased with the increment of BaTiO3 content up to 40 wt%. Overall, the nanocomposite generator with 2.0 wt% MWCNT and 40 wt% BaTiO3 nanofiber generated the highest average output voltage of ∼3.73 V, current of ∼1.37 μA, and power of ∼0.33 μW, which was feasible to light up commercial LEDs and to charge a capacitor after rectification, revealing the potentiality in powering self-sufficient nanodevices and wireless electronics.

Fabrication and in vitro biological properties of piezoelectric bioceramics for bone regeneration

The piezoelectric effect of biological piezoelectric materials promotes bone growth. However, the material should be subjected to stress before it can produce an electric charge that promotes bone repair and reconstruction conducive to fracture healing. A novel method for in vitro experimentation of biological piezoelectric materials with physiological load is presented. A dynamic loading device that can simulate the force of human motion and provide periodic load to piezoelectric materials when co-cultured with cells was designed to obtain a realistic expression of piezoelectric effect on bone repair. Hydroxyapatite (HA)/barium titanate (BaTiO3) composite materials were fabricated by slip casting, and their piezoelectric properties were obtained by polarization. The d33 of HA/BaTiO3 piezoelectric ceramics after polarization was 1.3 pC/N to 6.8 pC/N with BaTiO3 content ranging from 80% to 100%. The in vitro biological properties of piezoelectric bioceramics with and without cycle loading were investigated. When HA/BaTiO3 piezoelectric bioceramics were affected by cycle loading, the piezoelectric effect of BaTiO3 promoted the growth of osteoblasts and interaction with HA, which was better than the effect of HA alone. The best biocompatibility and bone-inducing activity were demonstrated by the 10%HA/90%BaTiO3 piezoelectric ceramics.

Structure and Charge Density Properties of (1 − x)(Na1−y K y NbO3)-xBaTiO3 Lead-Free Ceramic Solid Solution

(1 − x)(Na1−yKy)NbO3-xBaTiO3 (abbreviated as NKN-BT, x = 0.1, 0.2; y = 0.01, 0.05) ceramics were synthesized by the solid-state reaction method. Powder x-ray diffraction analysis in combination with the profile refinement method was employed for quantitative phase analysis and structural refinement. The x-ray diffraction study shows that phase transition occurs from tetragonal to distorted cubic with the compositions between x = 0.1 and x = 0.2. The spatial arrangements of the electron distribution and bonding nature of the samples have been analyzed through the maximum entropy method. The optical band gap energy of the prepared solid solutions has been determined using UV-visible spectrophotometry. The optical band gap energy of the solid solutions decreases with the increase in BaTiO3 content. The elemental composition of these ceramics has been studied using energy dispersive x-ray analysis and the microstructure has been examined by scanning electron microscopy. The piezoelectric coefficient (d33) measurement of the ceramics shows the enhancement of piezoelectric properties in the tetragonal phase. The maximum value of the piezoelectric coefficient (d33) obtained for the solid solution is 120 pC/N. With increasing BaTiO3 content in the solid solutions, the ferroelectric behavior weakens.

Piezoelectric and ferroelectric properties of lead-free (1-x)(Na1−yKy)(Nb1−zSbz)O3-xBaTiO3 solid solution

The solid solutions of lead-free (1-x)(Na1-yKy)(Nb1-zSbz)O3-xBaTiO3 (with x=0.1, 0.2; y=0.03, 0.05; z=0.05, 0.1) (abbreviated as (1-x)NKNS-xBT) ceramics have been synthesized using conventional solid-state reaction method. The results of X-ray diffraction analysis show that all the grown specimens of NKNS display typical perovskite structure. With BaTiO3 (BT) addition, a structural phase transition from tetragonal to cubic structure has been observed. The structural parameters of (1-x)NKNS-xBT powders were determined by profile refinements based on the analysis of X-ray powder diffraction. The charge density distributions of the prepared samples have been investigated by observed structure factors to understand the chemical bonding nature of (1-x)NKNS-xBT powders. The optical absorption of the ceramics has been investigated using UV–visible spectrophotometer. Scanning electron microscopic (SEM) measurements were performed to study the surface morphology of the prepared solid solutions. The elemental compositions of the (1-x)NKNS-xBT samples were analyzed by energy-dispersive X-ray (EDS) spectrometer. The dielectric constant versus temperature plots of the solid solutions exhibit ferroelectric to paraelectric phase transition, which is dependent on the BaTiO3 content. The ferroelectric nature of the samples has been determined through polarization and electric field hysteresis measurements.

Organic/Inorganic Nano-hybrids with High Dielectric Constant for Organic Thin Film Transistor Applications.

The organic material soluble polyimide (PI) and organic–inorganic hybrid PI–barium titanate (BaTiO3) nanoparticle dielectric materials (IBX, where X is the concentration of BaTiO3 nanoparticles in a PI matrix) were successfully synthesized through a sol–gel process. The effects of various BaTiO3 contents on the hybrid film performance and performance optimization were investigated. Furthermore, pentacene-based organic thin film transistors (OTFTs) with PI-BaTiO3/polymethylmethacrylate or cyclic olefin copolymer (COC)-modified gate dielectrics were fabricated and examined. The hybrid materials showed effective dispersion of BaTiO3 nanoparticles in the PI matrix and favorable thermal properties. X-ray diffraction patterns revealed that the BaTiO3 nanoparticles had a perovskite structure. The hybrid films exhibited high formability and planarity. The IBX hybrid dielectric films exhibited tunable insulating properties such as the dielectric constant value and capacitance in ranges of 4.0–8.6 and 9.2–17.5 nF cm−2, respectively. Adding the modified layer caused the decrease of dielectric constant values and capacitances. The modified dielectric layer without cross-linking displayed a hydrophobic surface. The electrical characteristics of the pentacene-based OTFTs were enhanced after the surface modification. The optimal condition for the dielectric layer was 10 wt% hybrid film with the COC-modified layer; moreover, the device exhibited a threshold voltage of 0.12 V, field-effect mobility of 4.32 × 10−1 cm2 V−1 s−1, and on/off current of 8.4 × 107.