UV-Vis-NIR反射光谱表征粉体材料的能隙值的方法

Characterization of Energy Gap Values of Colored Powdery Materials by UV-Vis-NIR Reflectance Spectra

运用涂膜法和UV-Vis-NIR反射光谱,提出了表征粉体材料能隙值的新方法。结果表明,当Vcoloed/VTiO2(有色粉体与钛白的体积比)小于5%时,通过反射光谱可得到表征材料在该波段吸波特性的Kubellka-Munk函数F,即F=(1-R∞)2/2R∞(R∞是涂层无限厚时的反射率)。将Kubellka-Munk函数F对波长(以电子伏特表示)作图,就可以得到表征材料能隙值的曲线。该方法操作简单,节省原料,同时由于去除了有色粉体粒子间的相互干扰,在实际研究中具有普遍性。

The new method for characterization of energy gaps values of powdery materials was investigated by UV-Vis-NIR reflectance spectra.When Vcoloed/VTiO2（volume ratio of colored powdered materials to titanium dioxide） was less than 5%,the Kubellka-Munk（K-M） function F=（1-R∞）2/2R∞（R∞ represents the coating reflectance when the film thick infinite） was obtained to characterize materials in that wave range.The energy gaps values of powdered materials can be estimated from K-M function of coating film plotted with wavelength（in the unit of electron volts）.The new method is conventional,and economizes raw materials,meanwhile that removes mutual interference between of color powdery grain,and has universality in factual study.