叶状Cu(OH)_2的合成及其向带有纳米孔的CuO的转化(英文)  

Facile Synthesis of Leaf-like Cu(OH)_2 and Its Conversion into CuO with Nanopores

作　　者：张良苗[1] 陆文聪[1] 冯永利[1] 倪纪朋[1] 吕勇[1] 尚兴付[1] 

机构地区：[1]上海大学化学系,上海200444

出　　处：《物理化学学报》2008年第12期2257-2262,共6页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20503015);上海市科委纳米专项(0852nm00700)资助项目

摘　　要：通过乳液界面反应法,用以Span80(sorbitan monooleate)作为稳定剂的乳液体系控制合成了叶状Cu(OH)2单晶.通过热处理,可以得到表面有纳米孔的CuO,且保持了原有的叶状形貌.通过X射线衍射(XRD)、Fourier红外光谱(FTIR)、扫描电镜(SEM)和透射电镜(TEM)观测了其形貌和结构特征.实验结果表明,叶状Cu(OH)2为单晶,且沿[111]晶面定向生长.孔的形成是由于相转变过程中Cu(OH)2失去H2O分子所致.通过观测不同反应时间产物的形貌,深入探讨了叶状Cu(OH)2纳米结构的组装机理.整个组装过程是由能量高的颗粒状纳米粒子通过端部取向连接定向生长而得到能量相对较低的叶状结构.并且得到的CuO的紫外光谱相对于其块体材料发生了蓝移,显示出比较大的禁带宽度.Leaf-like Cu（OH）2 single crystals were synthesized via the controlled emulsion interface method using Span80 （sorbitan monooleate） as the stabilizer of the emulsion system. CuO products with nanopores could be simply obtained by the dehydration of Cu（OH）2, while maintaining the strip-shaped architecture. The phase structures and morphologies were measured by X-ray diffraction （XRD）, Fourier transform infrared （FTIR） spectra, scanning electron microscopy （SEM）, and transmission electron microscopy （TEM）. Experimental results showed that Cu（OH）2 microleaves were single crystals and the growth direction seemed to be in [111] crystal plane of the orthorhombic Cu（OH）2. The formation of the nanopores should be attributed to the water loss of the transformation from Cu（OH）2 to CuO. The formation process of Cu（OH）2 was investigated by taking TEM images at different stages of the reaction. The formed nanoparticles began to rearrange to form nanorods and microleaves possibly via edge-by-edge and side-by-side oriented-attachments because of the formation of larger crystals greatly reducing the interfacial energy. Besides, CuO microarchitectures exhibit blue shifts in UV-Vis spectra and possess larger band gaps compared with those of bulk crystals.

关 键 词：叶状Cu(OH)2 乳液 软模板 CUO 纳米孔 

分 类 号：TB383.1[一般工业技术—材料科学与工程]