Influencing Factor Investigation on Dynamic Hydrothermal Growth of Gapped Hollow BaTiO3 Nanospheres

Gao, Jiabing; Shi, Haiyue; Yang, Jing; Li, Tao; Zhang, Rui; Chen, Deliang

doi:10.1186/s11671-015-1033-x

Cited by 15 publications

(8 citation statements)

References 41 publications

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“…In another synthesis starting with a mixture of TiO 2 sols and Ba(NO 3 ) 2 under a hydrothermal condition, gapped hollow BaTiO 3 nanospheres, 100 nm in diameter, were produced [38]. It was believed that the formation of such morphology was due to a combination of the orientated attachment and reversed crystal growth.…”

Section: Perovskites Abomentioning

confidence: 99%

Reversed Crystal Growth

Zhou

2018

Crystals

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In the last decade, a reversed growth route has been found in many crystal growth processes. In these systems, a single crystal does not develop from a single nucleus. The precursor molecules/ions or nanocrystallites aggregate into some large amorphous or polycrystalline particles. Multiple-nucleation on the surface of the amorphous particles or surface re-crystallization of the polycrystalline particles then takes place, forming a single crystal shell with a regular morphology. Finally, the crystallization extends from the surface to the core to form single crystals. This non-classical crystal growth route often results in some special morphologies, such as core-shell structures, hollow single crystals, sandwich structures, etc. This article gives a brief review of the research into reversed crystal growth and demonstrates that investigation of detailed mechanisms of crystal growth enables us to better understand the formation of many novel morphologies of the crystals. Some unsolved problems are also discussed.

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Section: Perovskites Abomentioning

confidence: 99%

Reversed Crystal Growth

Zhou

2018

Crystals

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“…38 The core@ shell Ag@BT particles have two sets of peaks that are consistent with Ag and BT with JPCDS 31-0174 (cubic, a = 0.403 nm). 39 Figure 7B shows the EDX spectra reflecting element distributions on the surface of the core@shell Ag@BT particles.…”

Section: Acs Applied Nano Materialsmentioning

confidence: 99%

Scalable Preparation of Fully Coated Ag@BaTiO₃ Core@Shell Particles via Poly(vinylpyrrolidone) Assistance for High-k Applications

Jian

Zhang

Yan

et al. 2018

ACS Appl. Nano Mater.

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This paper reports a poly(vinylpyrrolidone) (PVP)-assisted synthesis of Ag@BaTiO3 (BT) core@shell particles, consisting of smooth and fully coated BT shells on Ag cores. PVP adheres to Ag by coordination attraction, and it is present as a framework on the Ag surface. Driven by the adhesion forces from PVP, fully coated BT shells form on the template of the PVP framework. The shell phase is formed through a modified low-temperature direct synthesis method. Scanning electron microscopy examination of morphological evolution reveals smooth surfaces of the oxide coatings on Ag cores. X-ray diffraction pattern, energy-dispersive X-ray spectra, line scan, and mapping confirm the phase, chemical composition, and configuration of the shells. The synthesis method in this paper can achieve controllability of the growth rate and shell thickness. Because of the fully coated shells of BT, the poly(dimethylsiloxane) composites filled with synthesized core@shell fillers have very small leakage currents of ∼10–8–10–7 A/cm2. A high permittivity of 202 (εr/εm = 84) and a low dielectric loss of 0.003 are achieved at 1 MHz in composites filled with 40 vol % Ag@BT fillers. Lichtenecker’s theory containing the equivalent permittivity of core@shell Ag@BT originating from interfacial polarization is used to account for the dielectric constant of the composite. The smooth and fully coated Ag@BT core@shell particles can be used in composite materials for high-dielectric-constant and low-loss applications.

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“…From the above cases, one can see that different hydrothermal parameters and growth mechanisms can effectively adjust the formation of BaTiO 3 nanocrystals. In addition, a single cubic phase of BaTiO 3 can be formed at a low alkalinity, and a tetragonal phase of BaTiO 3 is easily formed under a strong alkaline condition [39].…”

Section: Introductionmentioning

confidence: 99%

TiO2-Seeded Hydrothermal Growth of Spherical BaTiO3 Nanocrystals for Capacitor Energy-Storage Application

et al. 2020

Crystals

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Simple but robust growth of spherical BaTiO3 nanoparticles with uniform nanoscale sizes is of great significance for the miniaturization of BaTiO3-based electron devices. This paper reports a TiO2-seeded hydrothermal process to synthesize spherical BaTiO3 nanoparticles with a size range of 90–100 nm using TiO2 (Degussa) and Ba(NO3)2 as the starting materials under an alkaline (NaOH) condition. Under the optimum conditions ([NaOH] = 2.0 mol L−1, RBa/Ti = 2.0, T = 210 °C and t = 8 h), the spherical BaTiO3 nanoparticles obtained exhibit a narrow size range of 91 ± 14 nm, and the corresponding BaTiO3/polymer/Al film is of a high dielectric constant of 59, a high break strength of 102 kV mm−1, and a low dielectric loss of 0.008. The TiO2-seeded hydrothermal growth has been proved to be an efficient process to synthesize spherical BaTiO3 nanoparticles for potential capacitor energy-storage applications.

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Influencing Factor Investigation on Dynamic Hydrothermal Growth of Gapped Hollow BaTiO3 Nanospheres

Cited by 15 publications

References 41 publications

Reversed Crystal Growth

Reversed Crystal Growth

Scalable Preparation of Fully Coated Ag@BaTiO₃ Core@Shell Particles via Poly(vinylpyrrolidone) Assistance for High-k Applications

TiO2-Seeded Hydrothermal Growth of Spherical BaTiO3 Nanocrystals for Capacitor Energy-Storage Application

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Influencing Factor Investigation on Dynamic Hydrothermal Growth of Gapped Hollow BaTiO3 Nanospheres

Cited by 15 publications

References 41 publications

Reversed Crystal Growth

Reversed Crystal Growth

Scalable Preparation of Fully Coated Ag@BaTiO3 Core@Shell Particles via Poly(vinylpyrrolidone) Assistance for High-k Applications

TiO2-Seeded Hydrothermal Growth of Spherical BaTiO3 Nanocrystals for Capacitor Energy-Storage Application

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Product

Resources

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Scalable Preparation of Fully Coated Ag@BaTiO₃ Core@Shell Particles via Poly(vinylpyrrolidone) Assistance for High-k Applications