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

机译:通过二元金属硝酸盐溶液热分解获得的ZnCo2O4纳米颗粒的功能性能

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摘要

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 degrees 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 O-2 atmospheric conditions are found to be 0.46 eV, 0.43 eV and 0.35 eV respectively for temperatures below 200 degrees C. For temperatures greater than 200 degrees 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.
机译:通过在相对低的温度下直接热分解二元金属硝酸盐溶液(100℃),制备尖晶石型ZnCo2O4纳米结晶颗粒。 X射线衍射和X射线光电子体光谱的结构研究显示ZnCo2O4的主要尖晶石晶相。具有选定区域衍射图案的高分辨率透射电子显微镜图像表明,脊髓型ZnCo2O4纳米颗粒的平均粒度约为20nm。磁性测量揭示了尖晶石型ZnCo2O4纳米颗粒的弱铁磁性性能。阻抗光谱测量表明制备的ZnCo2O4纳米颗粒的p型性质。 AR中的激活能量,空气和O-2大气条件分别为0.46eV,0.43eV和0.35eV分别在200摄氏度以下温度下。对于大于200摄氏度的温度,这些样品显示出具有激活能量的内在性质所有大气条件为0.57 eV。 ZnCo2O4纳米晶体显示出具有液化石油气的有希望的化学吸附过程相关的气体传感行为,并通过DC和AC阻抗测量来研究它们。讨论了ZnCo2O4的气体传感行为的机制。

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  • 来源
    《RSC Advances》 |2015年第34期|共7页
  • 作者单位

    Natl Inst Technol Dept Phys Kurukshetra 136119 Haryana India;

    Natl Inst Technol Dept Phys Kurukshetra 136119 Haryana India;

    Indian Inst Technol Delhi Dept Phys Nanophoton Lab New Delhi 110016 India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
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