Single‐Crystalline Barium Titanate Nanowires

Urban, Jeffrey J.; Spanier, Jonathan E.; Ouyang, Lian; Yun, Wan Soo; Park, Hongkun

doi:10.1002/adma.200390098

Cited by 167 publications

(124 citation statements)

References 40 publications

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“…33 Thus, the difference in dielectric properties of nanocomposites with the same PS-b-PMMA matrix used can be attributed to the size effect of BaTiO 3 NPs. 33,[49][50][51] Obviously, the results shown in Fig. 5 suggest that both the molecular weight of PS-b-PMMA as the matrix and the size of BaTiO 3 NPs as the inclusion have an effect on the resulting dielectric properties of PS-b-PMMA-PS-functionalized BaTiO 3 NP nanocomposites.…”

mentioning

confidence: 89%

Block copolymer/ferroelectric nanoparticle nanocomposites

Pang

Jiang

et al. 2013

Nanoscale

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Nanocomposites composed of diblock copolymer/ferroelectric nanoparticles were formed by selectively constraining ferroelectric nanoparticles (NPs) within diblock copolymer nanodomains via judicious surface modification of ferroelectric NPs. Ferroelectric barium titanate (BaTiO3) NPs with different sizes that are permanently capped with polystyrene chains (i.e., PS-functionalized BaTiO3NPs) were first synthesized by exploiting amphiphilic unimolecular star-like poly(acrylic acid)-block-polystyrene (PAA-b-PS) diblock copolymers as nanoreactors. Subsequently, PS-functionalized BaTiO3 NPs were preferentially sequestered within PS nanocylinders in the linear cylinder-forming polystyrene-block-poly(methyl methacrylate) (PS-b-PMMA) diblock copolymer upon mixing the BaTiO3 NPs with PS-b-PMMA. The use of PS-b-PMMA diblock copolymers, rather than traditional homopolymers, offers the opportunity for controlling the spatial organization of PS-functionalized BaTiO3 NPs in the PS-b-PMMA/BaTiO3 NP nanocomposites. Selective solvent vapor annealing was utilized to control the nanodomain orientation in the nanocomposites. Vertically oriented PS nanocylinders containing PS-functionalized BaTiO3 NPs were yielded after exposing the PS-b-PMMA/BaTiO3 NP nanocomposite thin film to acetone vapor, which is a selective solvent for PMMA block. The dielectric properties of nanocomposites in the microwave frequency range were investigated. The molecular weight of PS-b-PMMA and the size of BaTiO3 NPs were found to exert an apparent influence on the dielectric properties of the resulting nanocomposites.

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mentioning

confidence: 89%

Block copolymer/ferroelectric nanoparticle nanocomposites

Pang

Jiang

et al. 2013

Nanoscale

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“…10,22 Depending on 50 the crystal structure of the material, a small dimensional modification by an electric field, a change in temperature or a mechanical stress can create an electric polarisation change inside the crystal and hence give rise to the occurrence of pyroelectricity and piezoelectricity respectively. 10,22 A material's crystal 55 structure must lack a centre-of-symmetry (be "acentric") for it to show piezoelectricity, and be both acentric and possess a unique axis of symmetry (making it a "polar" structure) for it to be pyroelectric. There are 32 crystal classes, and 11 of them possess a centre of symmetry.…”

Section: A Primer On Ferroelectric Materialsmentioning

confidence: 99%

Ferroelectric nanoparticles, wires and tubes: synthesis, characterisation and applications

2013

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Nanostructured materials are central to the evolution of future electronics and information technologies. Ferroelectrics have already been established as a dominant branch in the electronics sector because of their diverse application range such as ferroelectric memories, ferroelectric tunnel junctions, etc. The on-going dimensional downscaling of materials to allow packing of increased numbers of components onto integrated circuits provides the momentum for the evolution of nanostructured ferroelectric materials and devices. Nanoscaling of ferroelectric materials can result in a modification of their functionality, such as phase transition temperature or Curie temperature (TC), domain dynamics, dielectric constant, coercive field, spontaneous polarisation and piezoelectric response. Furthermore, nanoscaling can be used to form high density arrays of monodomain ferroelectric nanostructures, which is desirable for the miniaturisation of memory devices. This review article highlights some research breakthroughs in the fabrication, characterisation and applications of nanoscale ferroelectric materials over the last decade, with priority given to novel synthetic strategies

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“…Recently, the interests on one-dimensional nanostructures (1DNS) of perovskite oxides are continuously increasing due to their collective properties and novel applications [1][2][3][4][5]. Variety of techniques, such as solution-phase decomposition [1,3], hydrothermal [5,6], flux [2], template [4,7], microemulsion [8] and electro-spinning [9] methods, have been developed to synthesize them.…”

Section: Introductionmentioning

confidence: 99%

“…Variety of techniques, such as solution-phase decomposition [1,3], hydrothermal [5,6], flux [2], template [4,7], microemulsion [8] and electro-spinning [9] methods, have been developed to synthesize them. And many further researches are directed towards the detailed experimental investigations on their size-dependent properties [3,4,6,10]. As an important perovskite oxide of excellent ferroelectric and optoelectronic characters, PT has been studied theoretically and experimentally in the past decades.…”

Section: Introductionmentioning

confidence: 99%

Phase transition and phonon characteristics of PbTiO3 single-crystal nanorods prepared in NaCl flux

Zhang¹,

Chen²

2016

Proceedings of the 5th International Conference on Mechanical Engineering, Materials and Energy (5th ICMEME2016)

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Abstract. By annealing PbTiO 3 (PT) nanoparticles together with surfactants in NaCl flux, single-crystal PT nanorods were prepared with diameters of 60-80nm and lengths of several micrometers. The PT nanorods are in tetragonal phase and grow along the (100) -1 to 50 cm -1 , whereas the mode B1+E keeps its frequency almost unchanged at 286 cm -1 . It is also noticed that both frequency and damping constant of mode E(1TO) show rapid changing with temperature only when temperature beyond 380 o C, blow the temperature they change very gradually. To explain the particular properties of the PT nanorods, the formation mechanism and an enhanced size effect have been discussed.

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Single‐Crystalline Barium Titanate Nanowires

Cited by 167 publications

References 40 publications

Block copolymer/ferroelectric nanoparticle nanocomposites

Block copolymer/ferroelectric nanoparticle nanocomposites

Ferroelectric nanoparticles, wires and tubes: synthesis, characterisation and applications

Phase transition and phonon characteristics of PbTiO3 single-crystal nanorods prepared in NaCl flux

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