Synthesis and characterization of pyroelectric nanocomposite formed of BaTiO<sub>3</sub>nanoparticles and a smectic liquid crystal matrix

Meneses-Franco, Ariel; Trujillo‐Rojo, V. H.; Soto‐Bustamante, Eduardo

doi:10.1080/01411594.2010.509617

Cited by 7 publications

(11 citation statements)

References 32 publications

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“…The TEM images were analyzed with the AxioVision Rel. 4.8 (Zeiss, Jena, Germany) image processing software [13]. …”

Section: Methodsmentioning

confidence: 99%

“…In this sense, the upconversion phenomena is one of the mechanisms responsible for the IR to visible light conversion. Considering our previous experiences with nanomaterials [13], we explore the feasibility of incorporating lanthanides into ferroelectric materials, taking special care of the physical properties of the new ceramics.…”

Section: Introductionmentioning

confidence: 99%

“…The final product is obtained when it reaches the amorphization temperature, which is around 850 °C for BT [38]. Then, the system is cooled down at room temperature, yielding high purity nanopowders with tetragonal symmetry [13,17]. With this synthetic method, it is possible to adjust certain conditions such as the O 2 partial pressure, annealing temperature, Er 3+ concentration or Ba/Ti ratio (R), among others which will finally produce changes in the material properties [39].…”

Section: Introductionmentioning

confidence: 99%

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Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Meneses-Franco¹,

Campos‐Vallette

Vásquez

et al. 2018

Materials

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Photoluminescent mechanisms in erbium-doped barium titanate nanoparticle systems were studied. Er3+ ions were introduced into the BaTiO3 lattice by the sol-gel method. The resulting Er3+ concentration was between 0% and 5%, with Ba/Ti ratios of 1.008 and 0.993. The stoichiometry of Ba and Ti concentrations in the lattice influenced the doping mechanism and placement of erbium ions in the lattice structure. Our research shows the existence of a strong correlation between Ba/Ti ratios, erbium concentration, phase structure and doping site location on the upconversion photoluminescence mechanisms. Competing upconversion emissions 2H11/2/4S3/2→4I15/2 at 523 and 548 nm respectively and other photoluminescent mechanisms as 4I9/2→4I11/2 around 4000 nm (2500 cm−1) were studied using Raman and emission spectroscopy. The upconversion process is predominant over other photoluminescent decay when the material presents high distortion in the surrounding activator.

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“…The TEM images were analyzed with the AxioVision Rel. 4.8 (Zeiss, Jena, Germany) image processing software [13]. …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Meneses-Franco¹,

Campos‐Vallette

Vásquez

et al. 2018

Materials

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“…A distribution of published journal papers along with major research highlights over the 2003–2017 periods are schematically shown in Figure 2 (published papers: 2003—[ 15 , 16 , 17 ]; 2004—[ 18 , 19 ]; 2005—[ 20 , 21 , 22 , 23 , 24 ]; 2006—[ 25 , 26 , 27 , 28 ]; 2007—[ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ]; 2008—[ 37 , 38 , 39 ]; 2009—[ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ]; 2010—[ 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 ]; 2011—[ 60 , 61 , 62 , 63 , 6...…”

Section: Liquid Crystals Doped With Ferroelectric Nanoparticles: Amentioning

confidence: 99%

“…Starting from 2007 more and more research groups became involved in studying the properties of liquid crystals doped with ferroelectric nanoparticles ( Figure 2 , [ 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ]). At the same time, the scope of research interests significantly expanded.…”

Section: Liquid Crystals Doped With Ferroelectric Nanoparticles: Amentioning

confidence: 99%

Ferroelectric Nanoparticles in Liquid Crystals: Recent Progress and Current Challenges

Garbovskiy

Glushchenko

2017

Nanomaterials

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The dispersion of ferroelectric nanomaterials in liquid crystals has recently emerged as a promising way for the design of advanced and tunable electro-optical materials. The goal of this paper is a broad overview of the current technology, basic physical properties, and applications of ferroelectric nanoparticle/liquid crystal colloids. By compiling a great variety of experimental data and discussing it in the framework of existing theoretical models, both scientific and technological challenges of this rapidly developing field of liquid crystal nanoscience are identified. They can be broadly categorized into the following groups: (i) the control of the size, shape, and the ferroelectricity of nanoparticles; (ii) the production of a stable and aggregate-free dispersion of relatively small (~10 nm) ferroelectric nanoparticles in liquid crystals; (iii) the selection of liquid crystal materials the most suitable for the dispersion of nanoparticles; (iv) the choice of appropriate experimental procedures and control measurements to characterize liquid crystals doped with ferroelectric nanoparticles; and (v) the development and/or modification of theoretical and computational models to account for the complexity of the system under study. Possible ways to overcome the identified challenges along with future research directions are also discussed.

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Modification of AFLC Physical Properties by Doping with BaTiO₃ Particles

Lalik

Deptuch

et al. 2020

J. Phys. Chem. B

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In this paper, for the first time, the influence of the BaTiO3 particles on the antiferroelectric liquid crystalline phase was shown. Low concentrations and two different sizes of BaTiO3 particles (nano- and submicroparticles) were used. It was found that admixture of the ferroelectric particles causes a decrease in the concentration of free ions in the liquid crystal matrix. Despite the small amount of admixture, a decrease in spontaneous polarization, switching time and rotational viscosity, was observed, while the tilt angle of molecules and the smectic layer thickness did not change. It turns out that BaTiO3 particles have a very large impact on the dielectric spectra not only in the antiferroelectric phase but also in the ferroelectric and paraelectric phases of the polymorphic mixture studied. The dopants affect also the complex conductivity. In this paper, we explain why some properties are modified by BaTiO3 particles and others are not.

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Synthesis and characterization of pyroelectric nanocomposite formed of BaTiO₃nanoparticles and a smectic liquid crystal matrix

Cited by 7 publications

References 32 publications

Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Ferroelectric Nanoparticles in Liquid Crystals: Recent Progress and Current Challenges

Modification of AFLC Physical Properties by Doping with BaTiO₃ Particles

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Synthesis and characterization of pyroelectric nanocomposite formed of BaTiO3nanoparticles and a smectic liquid crystal matrix

Cited by 7 publications

References 32 publications

Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Er-Doped Nanostructured BaTiO3 for NIR to Visible Upconversion

Ferroelectric Nanoparticles in Liquid Crystals: Recent Progress and Current Challenges

Modification of AFLC Physical Properties by Doping with BaTiO3 Particles

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Synthesis and characterization of pyroelectric nanocomposite formed of BaTiO₃nanoparticles and a smectic liquid crystal matrix

Modification of AFLC Physical Properties by Doping with BaTiO₃ Particles