铜基氧化物气凝胶的制备与表征

Synthesis and characterization of copper-based aerogels

以CuCl2.2H2O为前躯体,环氧丙烷为凝胶促进剂,制得了铜基氧化物气凝胶。通过场发射扫描电镜、高分辨透射电镜、X射线衍射、红外谱图及N2吸附等方法,对气凝胶的结构进行了表征。结果表明:室温下合成的铜基氧化物气凝胶呈现3维网络状结构,其骨架由大量微小晶粒组成,颗粒粒径为几nm;随处理温度的升高,体系中的有机相逐渐被灼烧完全,气凝胶也由3维网络状结构转变为致密结构;气凝胶随温度升高不断变化,并最终生成氧化铜气凝胶。N2吸附结果表明气凝胶具有较高的比表面积,为386m2/g。

Copper-based aerogels were prepared by sol-gel method using inorganic salt as precursor and propylene oxide as gelation agent.The morphology of the copper-based aerogels was characterized by field-emission scanning electron microscope（FESEM） and high-resolution transmission electron microscopy（HRTEM）,which suggests that the aerogels have a structure of 3-D networks and the skeleton is composed of CuO particles.The X-ray diffraction（XRD） results indicate that,the calcination of the aerogels at higher temperatures induces a phase change which results in the formation of copper oxide aerogels.The N2 adsorption/desorption result shows that the copper-based aerogels have a high specific surface area of about 386 m2/g.