中国物理B ›› 2013, Vol. 22 ›› Issue (7): 74401-074401.doi: 10.1088/1674-1056/22/7/074401

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Determining the thermophysical properties of Al-doped ZnO nanoparticles by the photoacoustic technique

T. A. El-Brolossya b, O. Sabera c, S. S. Ibrahima d   

  1. a Department of Physics, Faculty of Science, King Faisal University, Al-Ahsa, Saudi Arabia;
    b Department of Physics, Faculty of Science, Ain Shams University, Cairo, Egypt;
    c Egyptian Petroleum Research Institute, Cairo, Egypt;
    d Department of Physics, Faculty of Science, Cairo University, Giza, Egypt
  • 收稿日期:2012-11-05 修回日期:2013-01-15 出版日期:2013-06-01 发布日期:2013-06-01
  • 基金资助:
    Project supported by the Deanship of Scientific Research, King Faisal University, Saudi Arabia (Grant No. 130154).

Determining the thermophysical properties of Al-doped ZnO nanoparticles by the photoacoustic technique

T. A. El-Brolossya b, O. Sabera c, S. S. Ibrahima d   

  1. a Department of Physics, Faculty of Science, King Faisal University, Al-Ahsa, Saudi Arabia;
    b Department of Physics, Faculty of Science, Ain Shams University, Cairo, Egypt;
    c Egyptian Petroleum Research Institute, Cairo, Egypt;
    d Department of Physics, Faculty of Science, Cairo University, Giza, Egypt
  • Received:2012-11-05 Revised:2013-01-15 Online:2013-06-01 Published:2013-06-01
  • Contact: T. A. El-Brolossy E-mail:elbrolosyta@yahoo.com
  • Supported by:
    Project supported by the Deanship of Scientific Research, King Faisal University, Saudi Arabia (Grant No. 130154).

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摘要： Thermal conductivity and specific heat capacity of undoped and Al-doped (1-10 at.%) ZnO nanoparticles prepared using solvent thermal method are determined by measuring both thermal diffusivity and thermal effusivity of a pressed powder compact of the prepared nanoparticles using laser-induced photoacoustic technique. The impact of Al doping versus microstructure of the samples on such thermal parameters has been investigated. The results reveal an obvious enhancement in the specific heat capacity when decreasing the particle size, while the effect of Al doping on the specific heat capacity is minor. The measured thermal conductivities are about one order of magnitude smaller than that of the bulk ZnO due to several nested reducing heat transfer mechanisms. The results also show that Al doping significantly influences the thermal resistance. Using a simple thermal impedance model, the added thermal resistance due to Al dopant has been estimated.

关键词: ZnO nanoparticles, microstructure, specific heat, thermal conductivity

Abstract: Thermal conductivity and specific heat capacity of undoped and Al-doped (1-10 at.%) ZnO nanoparticles prepared using solvent thermal method are determined by measuring both thermal diffusivity and thermal effusivity of a pressed powder compact of the prepared nanoparticles using laser-induced photoacoustic technique. The impact of Al doping versus microstructure of the samples on such thermal parameters has been investigated. The results reveal an obvious enhancement in the specific heat capacity when decreasing the particle size, while the effect of Al doping on the specific heat capacity is minor. The measured thermal conductivities are about one order of magnitude smaller than that of the bulk ZnO due to several nested reducing heat transfer mechanisms. The results also show that Al doping significantly influences the thermal resistance. Using a simple thermal impedance model, the added thermal resistance due to Al dopant has been estimated.

Key words: ZnO nanoparticles, microstructure, specific heat, thermal conductivity

中图分类号:  (Heat flow in porous media)

  • 44.30.+v
44.10.+i (Heat conduction) 65.80.-g (Thermal properties of small particles, nanocrystals, nanotubes, and other related systems) 66.10.cd (Thermal diffusion and diffusive energy transport)