Abstract
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.
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Acknowledgments
This work was funded by NSF (NSF-REU program) and the Army Research Laboratory under Cooperative Agreement No. W911NF-04-2-0023. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation hereon.
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L. Claypoole—2007 NSF-REU Fellow.
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Chopra, N., Claypoole, L. & Bachas, L.G. Morphological control of Ni/NiO core/shell nanoparticles and production of hollow NiO nanostructures. J Nanopart Res 12, 2883–2893 (2010). https://doi.org/10.1007/s11051-010-9879-4
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DOI: https://doi.org/10.1007/s11051-010-9879-4