Infrared emissivity of transition elements doped ZnO

Abstract

Infrared emissivity was studied in Zn_0.99M_0.01O (M is Mn, Fe or Ni) and Zn_1−xCo_xO (x=0.01, 0.02, 0.03 and 0.04) powders synthesized by solid-state reaction at various temperatures. XRD patterns confirm the wurtzite structure of the prepared samples. No peaks of other phases arising from impurities are detected in Mn- and Co-doped ZnO, but the peaks of ZnFe₂O₄ and NiO are observed in Zn_0.99Fe_0.01O and Zn_0.99Ni_0.01O. The SEM observations indicate that with larger grain sizes than those of Zn_0.99Fe_0.01O and Zn_0.99Ni_0.01O, Co-doped ZnO exhibits smooth grain surfaces. The infrared absorption spectra show that infrared absorptions related to oxygen in Zn_0.99M_0.01O are much stronger than those in Co-doped ZnO. Co ions are dissolved into the ZnO lattice with Co²⁺ state from XPS spectra analysis. The infrared emissivity results imply that the emissivity of Zn_0.99Ni_0.01O is the highest (0.829) and that of Zn_0.99Co_0.01O is the lowest (0.784) at 1 200 °C. The emissivity of Zn_0.99Co_0.01O decreases to the minimum (0.752) at 1 150 °C and then increases with growing calcination temperature. As the Co doping content grows, the emissivity of Co-doped ZnO calcined at 1 200 °C falls to 0.758 in the molar fraction of 3% and then ascends.

Keywords

solid-state reaction / transition element doping / infrared absorption spectrum / infrared emissivity

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