Morphological control of Ni/NiO core/shell nanoparticles and production of hollow NiO nanostructures

Nitin Chopra, Leslie Claypoole, Leonidas G. Bachas

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Chemical synthesis coupled with a microwave irradiation process allowed for the control of size (6-40 nm), shape, and shell thickness of Ni/NiO core/shell nanoparticles. In this unique synthetic route, the size of Ni nanoparticles (NiNPs) was strongly influenced by the nickel salt-to-stabilizer ratio and the amount of the stabilizer. Interestingly, it was observed that the shape of the nanoparticles was altered by varying the reaction time, where longer reaction times resulted in annealing effects and rupture of the stabilizer micelle leading to distinct shapes of Ni/NiO core/shell nanostructures. Product cooling rate was another important parameter identified in this study that not only affected the shape, but also the crystal structure of the core/shell nanoparticles. In addition, a simple and cost-effective method of microwave irradiation of NiNPs led to the formation of distinctly shaped hollow NiO nanoparticles. These high surface area core/shell nanoparticles with well-controlled morphologies are important and can lead to significant advancement in the design of improved fuel cells, electrochromic display devices, and catalysis systems.

Original languageEnglish (US)
Pages (from-to)2883-2893
Number of pages11
JournalJournal of Nanoparticle Research
Issue number8
StatePublished - Oct 2010
Externally publishedYes


  • Core/shell nanoparticles
  • Crystal defects
  • Hollow nanostructures
  • Morphology
  • Nanocomposites
  • Nanomanufacturing
  • Nickel
  • Nickel oxide

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Modeling and Simulation
  • Materials Science(all)
  • Condensed Matter Physics


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