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Coating of TiO2 nanolayer on spherical Ni particles using a novel sol-gel route

Published online by Cambridge University Press:  03 March 2011

Jae-Young Lee ,
Seong-Hyeon Hong ,
Jong-Heun Lee ,
Yong Kyun Lee  and
Jae-Young Choi
Jae-Young Lee*
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Seong-Hyeon Hong
Affiliation:
School of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
Jong-Heun Lee
Affiliation:
Division of Materials Science and Engineering, Korea University, Seoul 136-701, Korea
Yong Kyun Lee
Affiliation:
Samsung Advanced Institute of Technology, P.O. Box 111, Suwon 440-600, Korea
Jae-Young Choi
Affiliation:
Samsung Advanced Institute of Technology, P.O. Box 111, Suwon 440-600, Korea
*
a)Address all correspondence to this author. e-mail: jongheun@korea.ac.kr
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Abstract

A nano-thin TiO2 layer was uniformly coated on spherical Ni particles for applications in multilayer ceramic capacitors via a controlled hydrolysis process using TiCl4, (C2H5)2NH (diethylamine, DEA), and C4H9OH as Ti-source, gradual (OH)- former, and solvent, respectively. At the constant [DEA]/[TiCl4] =10.6, the Ti-hydroxide could be coated uniformly using the dilute source solution ([TiCl4] ≤ 0.2 M) while the Ti-hydroxide powder in a separated form was frequently observed at [TiCl4] ≥ 0.4 M. A uniform coating was attained at the slower precipitation, and the kinetics of precipitation was controlled by tuning the trace amount of water in the solution. The TiO2-coating not only prevented Ni oxidation but also retarded the sintering between the Ni particles to a large extent.

Keywords

CoatingDielectricNanoparticle
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 6 , June 2004 , pp. 1669 - 1675
Copyright
Copyright © Materials Research Society 2004

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References

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