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所属单位：材料科学与技术学院

发表刊物：JOURNAL OF ALLOYS AND COMPOUNDS

关键字：Infrared emissivity Thermochromic Co-doped ZnO Solid-state reaction

摘要：In this paper, green Zn1-xCoxO nanopowders were synthesized via solid-state reaction at different calcination temperatures. The effects of sinterring temperature on structure, morphologies, color and infrared emissivity was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), UVevisible absorption spectroscopy, Raman spectroscopy and IR-2 dual-band infrared emissometer, respectively. The results show that the as-synthesized samples have hexagonal wurtzite structure and meantime the peaks of the secondary phase, Co3O4, were observed when the sinterring temperature is below 900 degrees C. The sintering temperature plays a vital important role in crystallite sizes, lattice parameters, volume of the unit cell as well as microstructure. According to the EDS results, Zn ions were substituted by the Co ions in the ZnO lattice where Co ions present in the +2 state indicated via XPS analysis. Additionally, UVevisible absorption spectra shows that absorption edge have a red shift while the corresponding energy band gap of the semiconductor nanoparticles decrease with the increasing sintering temperature, which affects the thermochromic characteristics of materials significantly. The infrared emissivity is related to the microstructure, grain size, conductivity and lattice vibration. (C) 2017 Elsevier B.V. All rights reserved.

ISSN号：0925-8388

是否译文：否

发表时间：2017-10-05

合写作者：Zhu, Yongmei,Guo, Tengchao,Hou, Haili,谭淑娟

通讯作者：Zhu, Yongmei,徐国跃