Fe掺杂摩尔分数对ZnO热致变色变发射率性能研究

Thermochromic and variable emissivity properties of Fe doped ZnO powders with different doping mole fraction

利用高温固相法制备不同摩尔分数Fe掺杂ZnO样品,通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、紫外-可见分光光度计(UV-Vis)、荧光分光光度计和IR-2双波段红外发射率测量仪等手段对样品进行晶体结构、微观形貌、光学性能和热致变色变发射率性能的测试和分析。结果表明:适量掺杂可使Fe离子取代ZnO中的部分Zn离子,不会改变ZnO原本的六方纤锌矿结构;随Fe摩尔分数的增加,ZnO晶体的结晶质量下降;室温下Fe掺杂ZnO样品呈桔黄褐色,随掺杂摩尔分数增加,样品颜色逐渐变深;当测试温度增加时,样品颜色变成深棕色,且具备可逆热致变色性能;掺杂后样品的红外发射率随测试温度增加先降后升,与样品中的杂质电离和晶格振动吸收密切相关。

Fe doped ZnO powders with different doping mole fraction were synthesized by the high temperature solid phase method.The structure,optical properties,thermochromic and variable emissivity properties were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),UV-Vis spectrophotometer,fluorescence spectrophotometer and IR-2 dual-band infrared emissivity measuring instrument.The results show that Fe ions substitute for some of the Zn ions in ZnO,which does not change the original hexagonal wurtzite structure of ZnO.As the doping concentration increases,the crystal quality of the crystal decreases.The color of Fe doped ZnO samples at room temperature is orange-brown,and the color of the sample becomes darker with the doping concentration increasing.When the testing temperature increases,the color of samples with reversible thermochromic properties change to clay brown.The infrared emissivity of the Fe doped samples shows a trend of decreasing first and then increasing with the increase of the testing temperature,which is closely related to impurity ionization and lattice vibration absorption in ZnO.