Citation: XU Chen, FANG Gang, LIU Chu-Yang, XU Guo-Yue, ZHU Yong-Mei, ZHANG Yan-Ting. Influences of Co²⁺ Doping Ratio on the Thermochromic and Variable Emissivity Properties of ZnO[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(9): 1625-1631. doi: 10.11862/CJIC.2018.203 shu

Influences of Co²⁺ Doping Ratio on the Thermochromic and Variable Emissivity Properties of ZnO

College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China

Corresponding author: LIU Chu-Yang, liuchuyang@nuaa.edu.cn
Received Date: 25 April 2018
Revised Date: 12 June 2018

Figures(10)

The ZnO powders doped by different ratios of Co²⁺ ions were synthesized via solid-state reaction. The effects of Co²⁺ doping ratio on microstructure and morphology, and thus on thermochromic and variable emissivity properties of ZnO were studied in detail. The results show that Co²⁺ ions would substitute for part of the Zn²⁺ ions in ZnO, and it does not change wurtzite(hexagonal) zincite crystal structure of the ZnO. While when doping ratio reaches 7.5% and 10%, impurity phase Co₃O₄ would form in the samples. The crystal quality and forbidden bandwidth of ZnO decreases gradually while morphology and grain size of ZnO barely change with doping ratio of Co²⁺ ions increasing. The Co²⁺ doped ZnO powders are green at room temperature, which gets deep initially and then becomes shallow with Co²⁺ content increasing. When the testing temperature improves from room temperature to 700℃, all the samples could turn into tawny color and the emissivity increases simultaneously. And the color change is more obvious and the change value in emissivity increases with enhancement of Co²⁺ doping ratio.
- zinc oxide,
- solid-state reaction,
- thermochromic,
- variable infrared emissivity
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Influences of Co2+ Doping Ratio on the Thermochromic and Variable Emissivity Properties of ZnO

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Influences of Co²⁺ Doping Ratio on the Thermochromic and Variable Emissivity Properties of ZnO