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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 512-515Synthesis and Thermal Characterization of Co-Doped...

Synthesis and Thermal Characterization of Co-Doped ZnO Nanocomposites Prepared by Sol-Gel Method

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Abstract:

Polyparaphenylene/Zn_0.925Co_0.075O(PPP/Zn_0.925Co_0.075O) nanocomposites were synthesized by using a sol-gel method and their thermal conductivity properties were measured. The XRD pattern of Zn_0.925Co_0.075O shows the single phase wurtzite structure. The SEM images show that the lighter-contrast area is PPP and the dark-contrast area is the polycrystalline of Zn_0.925Co_0.075O. The increase in the band edge is a clear indication for the incorporation of Co inside the ZnO lattice. The observation of three additional absorption peaks provided evidence that the 3d⁷ high-spin configuration of Co²⁺ under the tetrahedral crystal field was probably formed by neighboring O^2- ions. With the increase of the PPP content, the thermal conductivity of nanocomposite samples is smaller than those of pure Zn_0.925Co_0.075O. Due to the high density of interfaces and grain boundaries present in the nanocomposites, the scattering of phonon across a broad wavelength spectrum was enhanced. This suppressed the lattice thermal conductivity of the nanocomposites significantly.

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Periodical:

Advanced Materials Research (Volumes 512-515)

Pages:

1753-1756

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.512-515.1753

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Online since:

May 2012

Authors:

Zi Hua Wu, Hua Qing Xie, Qing Feng Zeng

Keywords:

PPP, Sol-Gel (SG), Thermal Conductivity (TC), Zinc Oxide (ZnO)

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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