Synthesis of homogeneous NiO@SiO 2 core-shell nanostructures and the effect of shell thickness on the magnetic Properties

Sonalika Vaidya, K. V. Ramanujachary, S. E. Lofland, Ashok K. Ganguli

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

We have developed a methodology to obtain NiO@SiO 2 core-shell nanostructures for the first time. These nanostractures have a NiO core of 25-20 nm diameter and silica shell of 5-10 nm. The shell thickness could be increased to 25 nm with appropriate loading of tetraethylorthosilicate. The shell structure was confirmed by transmission electron microscopy, energy- dispersive X-ray analysis and zeta potential studies. Electron paramagnetic resonance studies indicate the presence of free radicals on the surface of the SiO 2 shell. The increase in the magnetic susceptibility with shell thickness is explained by the enhancement of the free radicals associated with the silica shell. These magnetic core-shell nanostractures have potential as catalysts and in magnetic devices.

Original languageEnglish (US)
Pages (from-to)1666-1670
Number of pages5
JournalCrystal Growth and Design
Volume9
Issue number4
DOIs
StatePublished - Apr 1 2009

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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