Nearly Monodispersed Multifunctional NiCo2O4 Spinel Nanoparticles: Magnetism, Infrared Transparency, and Radiofrequency Absorption

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• 作者：Seema Verma ; Hrushikesh M. Joshi ; Tushar Jagadale ; Amit Chawla ; Ramesh Chandra ; Satishchandra Ogale
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：October 2, 2008
• 年：2008
• 卷：112
• 期：39
• 页码：15106-15112
• 全文大小：276K
• 年卷期：v.112,no.39(October 2, 2008)
• ISSN：1932-7455

文摘

We report low temperature synthesis of nearly monodispersed NiCo₂O₄ nanoparticles by a combustion method utilizing glycine as a fuel and nitrate as oxidizer. An appropriate glycine-to-metal nitrate molar ratio favors the formation of nearly monodispersed NiCo₂O₄ nanoparticles. We discuss the relevant synthesis chemistry and their detailed characterization using different techniques such as X-ray diffraction, high resolution transmission electron microscopy, superconducting quantum interference device magnetometry, and Fourier transform infrared spectroscopy. We also show the interesting evolution of the phase and magnetic properties of such nanoparticles upon annealing treatment. Importantly, these nanoparticles show a high (∼83%) infrared transparency that is useful for specific solar and fuel cell electrode applications as well as significant radiofrequency (RF) absorption causing substantial heating of their aqueous dispersion that should have potential applications for magnetic hyperthermia.