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

Journal of Materials Research - Tập 21 Số 12 - Trang 3187-3195 - 2006
Zhuoying Chen1, Limin Huang1, Jiaqing He2, Yimei Zhu2, Stephen O’Brien1
1Department of Applied Physics and Applied Mathematics, the Columbia Materials Research Science and Engineering Center (MRSEC), and the Columbia Nanocenter (NSEC), Columbia University, New York, USA
2Department of Materials Science, Brookhaven National Laboratory, Upton, USA

Tóm tắt

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.

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Journal of Materials Research

Tập 21 Số 12

3187-3195

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