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

Jae Young Lee, Seong Hyeon Hong, Jong Heun Lee, Yong Kyun Lee, Jae Young Choi

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1669-1675
Number of pages7
JournalJournal of Materials Research
Volume19
Issue number6
DOIs
Publication statusPublished - 2004 Jun

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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