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Ferroelectric phase transition in individual single-crystalline BaTiO3 nanowires

Spanier, JE and Kolpak, AM and Urban, JJ and Grinberg, I and Lian, OY and Yun, WS and Rappe, AM and Park, H (2006) Ferroelectric phase transition in individual single-crystalline BaTiO3 nanowires. NANO LETTERS, 6 (4). pp. 735-739.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl052538e

Abstract

We report scanned probe characterizations of the ferroelectric phase transition in individual barium titanate (BaTiO3) nanowires. Variable-temperature electrostatic force microscopy is used to manipulate, image, and evaluate the diameter-dependent stability of ferroelectric polarizations. These measurements show that the ferroelectric phase transition temperature (T-c) is depressed as the nanowire diameter (d(nw)) decreases, following a 1/d(nw) scaling. The diameter at which Tc falls below room temperature is determined to be similar to 3 nm, and extrapolation of the data indicates that nanowires with dnw as small as 0.8 nm can support ferroelectricity at lower temperatures. We also present density functional theory (DFT) calculations of bare and molecule-covered BaTiO3 surfaces. These calculations indicate that ferroelectricity in nanowires is stabilized by molecular adsorbates such as OH and carboxylates. These adsorbates are found to passivate polarization charge more effectively than metallic electrodes, explaining the observed stability of ferroelectricity in small-diameter BaTiO3 nanowires.

Item Type:Article
Subjects:Physical Science > Nanophysics
ID Code:2759
Deposited By:Lesley Tobin
Deposited On:16 Jan 2009 16:36
Last Modified:16 Jan 2009 16:36

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