Abstract
Shape-selective formation of CoO nanoparticles has been developed using a simple one-step in situ non-micellar microwave (MW) heating method. CoO NPs were synthesized by mixing aqueous CoCl2·6H2O solution with poly (vinyl) alcohol (PVA) in the presence of sodium hydroxide (NaOH). The reaction mixture was irradiated using MW for a total time of 2 min. This process exclusively generated different shapes like nanosphere, nanosheet, and nanodendrite structures just by tuning the Co(II) ion to PVA molar ratios and controlling other reaction parameters. The proposed synthesis method is efficient, straightforward, reproducible, and robust. Other than in catalysis, these cobalt oxide nanomaterials can be used for making pigments, battery materials, for developing solid state sensors, and also as an anisotropy source for magnetic recording.
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Acknowledgments
We wish to acknowledge Dr. Vijayamohanan K. Pillai, Director, CSIR-CECRI, for his support and encouragement. The institute start-up research funding (Project number OLP-0067), support from the Central Instrumental Facility (CIF), and help from Mr. A. Rathishkumar (TEM in- charge, CIF), CSIR-CECRI, Karaikudi, are greatly appreciated.
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Kundu, S., Jayachandran, M. Shape-selective synthesis of non-micellar cobalt oxide (CoO) nanomaterials by microwave irradiations. J Nanopart Res 15, 1543 (2013). https://doi.org/10.1007/s11051-013-1543-3
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DOI: https://doi.org/10.1007/s11051-013-1543-3