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Issue 34, 2015
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Functional properties of ZnCo2O4 nano-particles obtained by thermal decomposition of a solution of binary metal nitrates

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Abstract

Spinel-type ZnCo2O4 nano-crystalline particles are prepared by direct thermal decomposition of a solution of binary metal nitrates at a relatively low temperatures (100 °C). Structural studies by X-ray diffraction and X-ray photoelectron spectroscopy reveal the predominant spinel crystal phase for ZnCo2O4. The high resolution transmission electron microscopy images with selected area diffraction patterns show that the spinal-type ZnCo2O4 nano-particles have a mean particle size of around 20 nm. Magnetic measurement reveals weak ferromagnetic properties for the spinel-type ZnCo2O4 nano-particles. The impedance spectroscopy measurement suggests a p-type nature for the prepared ZnCo2O4 nano-particles. The activation energies in Ar, air and O2 atmospheric conditions are found to be 0.46 eV, 0.43 eV and 0.35 eV respectively for temperatures below 200 °C. For temperatures greater than 200 °C, these samples show an intrinsic nature with activation energy of 0.57 eV for all atmospheric conditions. The ZnCo2O4 nano-crystals show a promising chemisorption process-related gas sensing behaviour for liquefied petroleum gas and they are investigated by DC and AC impedance measurements. A mechanism for the gas sensing behaviour of ZnCo2O4 is discussed.

Graphical abstract: Functional properties of ZnCo2O4 nano-particles obtained by thermal decomposition of a solution of binary metal nitrates

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Publication details

The article was received on 31 Jan 2015, accepted on 27 Feb 2015 and first published on 27 Feb 2015


Article type: Paper
DOI: 10.1039/C5RA01937K
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Citation: RSC Adv., 2015,5, 26843-26849
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    Functional properties of ZnCo2O4 nano-particles obtained by thermal decomposition of a solution of binary metal nitrates

    C. R. Mariappan, R. Kumar and G. Vijaya Prakash, RSC Adv., 2015, 5, 26843
    DOI: 10.1039/C5RA01937K

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