Hydrothermal synthesis of tetragonal BaTiO3 nanotube arrays with high dielectric performance.

Hydrothermal synthesis of tetragonal BaTiO3 nanotube arrays with high dielectric performance.

Journal of nanoscience and nanotechnology (2014-04-18)

Liming Wang, Xiangyun Deng, Jianbao Li, Xinxing Liao, Guoqing Zhang, Chunpeng Wang, Kuifan Su

ABSTRACT

Tetragonal Barium titanate (BaTiO3) nanotube arrays have been prepared using the template-assisted hydrothermal method combined with an annealing process. The in-situ chemical conversion of TiO2 nanotube array templates ensured that BaTiO3 maintained the morphology of the nanotube architectures. Moreover, X-ray diffraction and Raman spectrum characterization were used to confirm that the BaTiO3 nanotube arrays had a tetragonal phase after the use of a simple annealing technique. Typical hysteresis loops showed their ferroelectricity, with the remanent polarization and coercive fields being 2.57 microC/cm2 and 2.52 kV/cm, respectively. The relative dielectric constant of the tetragonal BaTiO3 nanotube arrays reached up to 1000 and the dielectric loss was as low as 0.02 at 1 kHz at room temperature.

MATERIALS

Product Number

Brand

Product Description

208108

Sigma-Aldrich

Barium titanate(IV), powder, <3 μm, 99%

338842

Sigma-Aldrich

Barium titanate(IV), powder, <2 μm, 99.5% trace metals basis

467634

Sigma-Aldrich

Barium titanate(IV), nanopowder (cubic crystalline phase), <100 nm particle size (BET), ≥99% trace metals basis

745952

Sigma-Aldrich

Barium titanate(IV), nanopowder (cubic), 50 nm (SEM), 99.9% trace metals basis

305812

Sigma-Aldrich

Titanium, 5-10 mm, ≥99.99% trace metals basis (purity exclusive of Na and K content)

IRMM531B

Titanium, IRMM^®, certified reference material, 0.5 mm foil

IRMM531C

Titanium, IRMM^®, certified reference material, 0.5 mm wire

GF62977540

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GF25290581

Titanium, tube, 1000mm, outside diameter 25.4mm, inside diameter 23.62mm, wall thickness 0.89mm, annealed, 99.6+%

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GF25880485

Titanium, tube, 100mm, outside diameter 6.35mm, inside diameter 5.53mm, wall thickness 0.41mm, annealed, 99.6+%

GF46592949

Titanium, wire, straight, 1000mm, diameter 1.0mm, as drawn, 99.6+%

267902

Sigma-Aldrich

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348791

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Titanium, wire reel, 10m, diameter 1.5mm, as drawn, 99.6+%

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Titanium, wire reel, 25m, diameter 0.20mm, annealed, 99.6+%

GF76266423

Titanium, wire reel, 0.5m, diameter 1.0mm, annealed, 99.6+%

266035

Sigma-Aldrich

Titanium, wire, diam. 1.0 mm, 99.99% trace metals basis

460400

Sigma-Aldrich

Titanium, wire, diam. 0.25 mm, 99.7% trace metals basis

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Sigma-Aldrich

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Titanium, wire reel, 200m, diameter 0.20mm, annealed, 99.6+%