摘要
以无机铜盐CuCl2的醇溶液为前驱体，采用聚丙烯酸（PAA）为分散剂，环氧丙烷为凝胶促进剂，通过溶胶-凝胶工艺（sol-gel process）制备了铜基醇凝胶，再经CO2超临界流体干燥工艺得到浅绿色块状初始铜基气凝胶，最后经过热处理获得黑色块状纯氧化铜气凝胶样品，其平均密度约为300mg／cm^3。用扫描电子显微镜（SEM）对气凝胶的微结构进行分析可知，最终获得的气凝胶样品主要由百纳米级的矩体颗粒堆砌而成。X射线衍射（XRD）分析表明初始样品具有典型的无定形结构，其主要的结晶成份为斜方晶Cu^2＋ 2 Cl（OH）3，而X射线荧光光谱（XRF）测试结果表明其Cu与Cl的元素比为3．55：1，高于Cu^2 ＋2 Cl（OH）3中两元素的化学计量比，结合化学原理分析可知，其未结晶成分主要为水合氢氧化铜。而XRD的测试结果表明，经过500℃热处理后的样品成分主要为单斜晶氧化铜。
Monolithic copper oxide aerogels were prepared from copper chloride, propylene oxide and polyacrylic acid. Firstly, by using of polyacrylic acid as a dispersant and propylene oxide as an accelerator, the copper-contained alcogel could be made via the sol-gel process. Then the initial light-green monolithic sample could be obtained by the process of aging and supercritical drying. Finally, the black monolithic sample with density of about 300 mg/cm^3 could be obtained by the thermal treatment at 500℃. SEM studies indicated that the final sample being a kind of porous materials consisted of nearly rectangular, submicron particles. In term of XRD, it indicated that the crystal part of initial aerogels was mostly orthorhombic copper chloride hydroxide （Cu^2＋ 2 CI（OH）3）, while the non-crystal part was Cu（OH）2, taken analysis of chemical principle and XRF result （Cu：C1 equal to 3.55 ： 1, which is greater than 2 ： 1 in Cu^2＋2CI（OH）3） as consideration. And the final sample was monoclinic copper oxide.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2007年第A06期2150-2154,共5页
Journal of Functional Materials
基金
基金项目：上海市科技启明星计划资助项目（05QMx1454）
