纳米硫化铜近红外吸收材料

Nano-Copper Sulfide for Absorbing Near Infrared Light

采用新型超声喷雾法技术,把摩尔分数都为0.5%的Cu(NO3)2和Na2S水溶液分别作为初始反应溶液,调节溶液体系的pH值在6～8,把经过超声雾化后的Cu(NO3)2溶液逐步加入到处于强力搅拌的Na2S水溶液中,经陈化过滤后获得纳米半导体硫化铜(CuxS,1≤x≤2)粉体。分析了不同热处理温度与原料配比对获得的硫化铜纳米颗粒化学成分的影响,用X射线粉末衍射仪表征了纳米硫化铜粒子的晶相与化学组成,并采用扫描电镜观察了相应化学组成的粒子晶相形貌,测定了不同化学组分纳米硫化铜粒子从可见到近红外胶体状的吸收和透射光谱。研究表明不同化学组成的纳米硫化铜对近红外光都具有显著的吸收效应,这是由于电子在硫化铜半导体纳米粒子能带中的跃迁所致,同时这些半导体粒子对可见光具有很高透过性,但其可见光透射率随着纳米粒子从Cu2S趋向CuS而略有下降。

The nano copper sulfide is prepared by ultrasonic atomization with Cu（NO3）2 and Na2S solutions of 0.5%（mole fraction） as raw materials.The pH value of the solution is adjusted to 6~8.The atomized Cu（NO3）2 is gradually added into the solution of Na2S which is strongly stirred.The nano-semiconductor copper sulfides（CuxS,1≤x≤2） are obtained after aging and filtering.The influence of heated temperatures and ratio of raw materials on chemical composition of copper sulfide are analysed.The phase of copper sulfide and the chemical composition are investigated by X-ray powder diffraction（XRD）.The morphological image of the copper sulfide is observed by scanning electron microscope（SEM）.The absorptivity and transmittance of copper sulfide in state of sol from ultraviolet to near infrared wavelength are recorded.The results indicate that the copper sulfides are of high absorbance for near infrared light,which are attributed to the electronic transitions in the energy bands.They also have high transmittance for visible light.The transmittance declines slightly along with Cu2S approaching to CuS.