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Barium titanate nanocrystals and nanocrystal thin films: Synthesis, ferroelectricity, and dielectric properties
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10.1063/1.2218765
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    Affiliations:
    1 Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027; The Columbia Materials Research Science and Engineering Center (MRSEC), Columbia University, New York, New York 10027; and The Columbia Nanocenter (NSEC), Columbia University, New York, New York 10027
    2 Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 and The Columbia Materials Research Science and Engineering Center (MRSEC), Columbia University, New York, New York 10027
    3 Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027; The Columbia Materials Research Science and Engineering Center (MRSEC), Columbia University, New York, New York 10027; and The Columbia Nanocenter (NSEC), Columbia University, New York, New York 10027
    4 Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 and The Columbia Materials Research Science and Engineering Center (MRSEC), Columbia University, New York, New York 10027
    5 Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027; The Columbia Materials Research Science and Engineering Center (MRSEC), Columbia University, New York, New York 10027; and The Columbia Nanocenter (NSEC), Columbia University, New York, New York 10027
    6 Department of Electrical Engineering, Columbia University, New York, New York 10027 and The Columbia Nanocenter (NSEC), Columbia University, New York, New York 10027
    7 Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027; The Columbia Materials Research Science and Engineering Center (MRSEC), Columbia University, New York, New York 10027; and The Columbia Nanocenter (NSEC), Columbia University, New York, New York 10027
    a) Electronic mail: so188@columbia.edu
    J. Appl. Phys. 100, 034316 (2006); http://dx.doi.org/10.1063/1.2218765
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View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Powder XRD pattern of nanocrystals and (inset) TEM image of the corresponding nanocrystals.

Image of FIG. 2.
FIG. 2.

Room temperature Raman scattering spectra of (a) BT nanocrystals before and (b) after annealing at for .

Image of FIG. 3.
FIG. 3.

(Color online) Tapping mode AFM images of individual nanocrystals on various substrates. [(a) and (c)] -type Si wafer with native oxide layer showing a size distribution of based on the height measurement, and [(b) and (d)] on substrate showing a size distribution of .

Image of FIG. 4.
FIG. 4.

(Color online) Tapping mode AFM images of nanocrystals on Pt-coated substrates. (a) bare substrate, showing the roughness of the Pt coating surface; (b) nanocrystals from BT oxide nanoparticle solution (1:2 by volume), showing a large degree of aggregation in addition to some isolated nanocrystals; (c) nanocrystals from a much diluted BT oxide solution (1:8), showing less aggregation and large crystal size distribution of ; and (d) well dispersed nanocrystals from diluted BT oxide solution with surfactant P123 additive (1:2 by volume).

Image of FIG. 5.
FIG. 5.

(Color online) (a) SEM image of a micropatterned nanocrystal thin films prepared by MIMIC with a micropatterned PDMS stamp. (b) High-resolution SEM image of nanocrystal thin film prepared by spin coating, showing that the thin film is composed of nanocrystals with a uniform size of . (c) Tapping mode AFM image of the nanocrystal thin film. All these films were prepared on substrates with native oxide layers.

Image of FIG. 6.
FIG. 6.

(Color online) [(a) and (c)] SEM images of triple-coated thin film on substrates at different magnifications; (b) Tapping mode AFM image of the thin film; and (d) optical microscopy of the thin film.

Image of FIG. 7.
FIG. 7.

SEM images of thin films (four coatings) on substrate (a) top-view and (b) cross-section view.

Image of FIG. 8.
FIG. 8.

(Color online) Polarization vs applied electric field hysteresis loop of the thin films at room temperature (a) triple coatings and (b) four coatings.

Image of FIG. 9.
FIG. 9.

Remanent polarization. values of samples of different grain size from literature and present work. ( film).

Image of FIG. 10.
FIG. 10.

(Color online) Frequency dependence of the dielectric constant and dielectric loss of the nanocrystal thin film at room temperature.

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/content/aip/journal/jap/100/3/10.1063/1.2218765
2006-08-10
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Barium titanate nanocrystals and nanocrystal thin films: Synthesis, ferroelectricity, and dielectric properties
http://aip.metastore.ingenta.com/content/aip/journal/jap/100/3/10.1063/1.2218765
10.1063/1.2218765
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