Wet chemical synthesis of rare earth-doped barium titanate nanoparticles

Gomes, Maria A.; Lima, Álvaro Silva; Eguiluz, Katlin I.B.; Salazar‐Banda, Giancarlo R.

doi:10.1007/s10853-016-9789-7

Cited by 43 publications

(24 citation statements)

References 101 publications

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“…BaTiO 3 (BT) has been of technological interest for many years due to its ferroelectric properties below 125 • C (non-volatile ferroelectric memories), piezo-and pyroelectricity (sonar, detectors, bone implants), and high dielectric constant and low dielectric loss (capacitors, thermistors, transducers) [4]. A variety of precursors and solvents have been shown to yield BT under various hydrothermal conditions [5].…”

Section: Introductionmentioning

confidence: 99%

Facile Low Temperature Hydrothermal Synthesis of BaTiO3 Nanoparticles Studied by In Situ X-ray Diffraction

et al. 2018

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Ferroelectric materials are crucial for today's technological society and nanostructured ferroelectric materials are important for the downscaling of devices. Controlled and reproducible synthesis of these materials are, therefore, of immense importance. Hydrothermal synthesis is a well-established synthesis route, with a large parameter space for optimization, but a better understanding of nucleation and growth mechanisms is needed for full utilization and control. Here we use in situ X-ray diffraction to follow the nucleation and growth of BaTiO 3 formed by hydrothermal synthesis using two different titanium precursors, an amorphous titania precipitate slurry and a Ti-citric acid complex solution. Sequential Rietveld refinement was used to extract the time dependency of lattice parameters, crystallite size, strain, and atomic displacement parameters. Phase pure BaTiO 3 nanoparticles, 10-15 nm in size, were successfully synthesized at different temperatures (100, 125, and 150 • C) from both precursors after reaction times, ranging from a few seconds to several hours. The two precursors resulted in phase pure BaTiO 3 with similar final crystallite size. Finally, two different growth mechanisms were revealed, where the effect of surfactants present during hydrothermal synthesis is discussed as one of the key parameters.

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Section: Introductionmentioning

confidence: 99%

Facile Low Temperature Hydrothermal Synthesis of BaTiO3 Nanoparticles Studied by In Situ X-ray Diffraction

et al. 2018

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“…Herein, we present a rational method to synthesize high‐ k BTO:La nanocuboids (NCs) and the fabrication of efficient flexible ACEL devices via a simple solution‐processing method . We synthesized BTO:La NCs with a larger permittivity than the pure BTO via the local disorder induced by an aliovalent substitution between barium ions (Ba 2+ ) and La 3+ .…”

Section: Introductionmentioning

confidence: 99%

Solution‐Processable, High‐Performance Flexible Electroluminescent Devices Based on High‐k Nanodielectrics

Shanker

Cho

Choe

et al. 2019

Adv Funct Materials

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Flexible alternating-current electroluminescent (ACEL) devices have attracted considerable attention for their ability to produce uniform light emission under bent conditions and have enormous potential for applications in back lighting panels, decorative lighting in automobiles, and panel displays. Nevertheless, flexible ACEL devices generally require a high operating bias, which precludes their implementation in low power devices. Herein, solutionprocessed La-doped barium titanate (BTO:La) nanocuboids (≈150 nm) are presented as high dielectric constant (high-k) nanodielectrics, which can enhance the dielectric constant of an ACEL device from 2.6 to 21 (at 1 kHz), enabling the fabrication of high-performance flexible ACEL devices with a lower operating voltage as well as higher brightness (≈57.54 cd m −2 at 240 V, 1 kHz) than devices using undoped BTO nanodielectrics (≈14.3 cd m −2 at 240 V, 1 kHz). Furthermore, a uniform brightness across the whole panel surface of the flexible ACEL devices and excellent device reliability are achieved via the use of uniform networks of crossaligned silver nanowires as highly conductive and flexible electrodes. The results offer experimental validation of high-brightness flexible ACELs using solution-processed BTO:La nanodielectrics, which constitutes an important milestone toward the implementation of high-k nanodielectrics in flexible displays.

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“…As an alternative, different wet chemical methods have been employed to produce BaTiO 3 nanometer-scale powders including sol-gel, Pechini, sol-emulsion-gel, and solvothermal and coprecipitation methods. These methods allow precursor homogeneity at an atomic level and employ lower calcination temperatures compared with a conventional solid-state method [8]. The main problems in using these wet chemical procedures are the highly toxic and hazardous precursors and solvents, the long duration of the reaction process, and the possibility of contamination by modifying agents (mineralizing and precipitation agents) [8,9].…”

Section: Introductionmentioning

confidence: 99%

An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water

Gomes

Magalhães

Paschoal

et al. 2018

Journal of Nanomaterials

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BaTiO 3 nanoparticles were successfully synthesized by a new coconut water-based sol-gel method using Ba(CH 3 COO) 2 and TiCl 3 as the starting salts. The influence of the amount of coconut water and calcination conditions on the barium titanate crystallization was investigated. The resulting nanoparticles were characterized by thermogravimetric and differential thermal analysis, X-ray diffraction, scanning electron microscopy, and Raman and Fourier transform infrared (FTIR) spectroscopies. The ferroelectric tetragonal single phase of BaTiO 3 was obtained in samples prepared with a ratio of coconut water volume (mL)/BaTiO 3 mass (g) of 25 : 2 and 30 : 2, calcined at 1100°C, which was confirmed by XRD measurements. Crystallites with an average size of about 31 nm for both samples were obtained, and microscopy images revealed the presence of particles in the range of 40 to 60 nm. Raman and FTIR spectra confirmed the dominant tetragonal phase of BaTiO 3 , meanwhile traces of BaCO 3 were identified in FTIR spectra.

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Wet chemical synthesis of rare earth-doped barium titanate nanoparticles

Cited by 43 publications

References 101 publications

Facile Low Temperature Hydrothermal Synthesis of BaTiO3 Nanoparticles Studied by In Situ X-ray Diffraction

Facile Low Temperature Hydrothermal Synthesis of BaTiO3 Nanoparticles Studied by In Situ X-ray Diffraction

Solution‐Processable, High‐Performance Flexible Electroluminescent Devices Based on High‐k Nanodielectrics

An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water

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Wet chemical synthesis of rare earth-doped barium titanate nanoparticles

Cited by 43 publications

References 101 publications

Facile Low Temperature Hydrothermal Synthesis of BaTiO3 Nanoparticles Studied by In Situ X-ray Diffraction

Facile Low Temperature Hydrothermal Synthesis of BaTiO3 Nanoparticles Studied by In Situ X-ray Diffraction

Solution‐Processable, High‐Performance Flexible Electroluminescent Devices Based on High‐k Nanodielectrics

An Eco-Friendly Method of BaTiO3 Nanoparticle Synthesis Using Coconut Water

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An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water