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New nonhydrolytic route to synthesize crystalline BaTiO3 nanocrystals with surface capping ligands

Published online by Cambridge University Press:  03 March 2011

Zhuoying Chen ,
Limin Huang ,
Jiaqing He ,
Yimei Zhu  and
Stephen O'Brien
Zhuoying Chen
Affiliation:
Department of Applied Physics and Applied Mathematics, the Columbia Materials Research Science and Engineering Center (MRSEC), and the Columbia Nanocenter (NSEC), Columbia University, New York, New York 10027
Limin Huang
Affiliation:
Department of Applied Physics and Applied Mathematics, the Columbia Materials Research Science and Engineering Center (MRSEC), and the Columbia Nanocenter (NSEC), Columbia University, New York, New York 10027
Jiaqing He
Affiliation:
Department of Materials Science, Brookhaven National Laboratory, Upton, New York 11973
Yimei Zhu
Affiliation:
Department of Materials Science, Brookhaven National Laboratory, Upton, New York 11973
Stephen O'Brien*
Affiliation:
Department of Applied Physics and Applied Mathematics, the Columbia Materials Research Science and Engineering Center (MRSEC), and the Columbia Nanocenter (NSEC), Columbia University, New York, New York 10027
*
a) Address all correspondence to this author.e-mail: so188@columbia.edu
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Abstract

A new nonhydrolytic route for the preparation of well-crystallized size-tunable barium titanate (BaTiO3) nanocrystals capped with surface ligands is reported. Our approach involves: (i) synthesizing a “pseudo” bimetallic precursor, and (ii) combining the as-synthesized bimetallic precursor with a mixture of oleylamine with different surface coordinating ligands at 320 °C for crystallization and crystal growth. Different alcohols in the precursor synthesis and different carboxylic acids were used to study the effect of size and morphological control over the nanocrystals. Nanocrystals of barium titanate with diameters of 6–10 nm (capped with decanoic acid), 3–5 nm (capped with oleic acid), 10–20 nm (a nanoparticle and nanorod mixture capped with oleyl alcohol), and 2–3 nm (capped with oleyl alcohol) were synthesized, and can be easily dispersed into nonpolar solvents such as hexane or toluene. Techniques including x-ray diffraction, transmission electron microscopy, selected area electron diffraction, and high-resolution electron microscopy confirm the crystallinity and morphology of these as-synthesized nanocrystals.

Keywords

Chemical synthesisFerroelectricNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 12 , December 2006 , pp. 3187 - 3195
Copyright
Copyright © Materials Research Society 2006

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