Formation mechanism of porous single-crystal Cr2O3 and Co3O4 templated by mesoporous silica
Formation mechanism of porous single-crystal Cr2O3 and Co3O4 templated by mesoporous silica
复制标题
DOI：
10.1021/cm060014p
复制
发表时间：
2006-06-27
影响因子：
8.6
通讯作者：
He, Heyong
中科院分区：
文献类型：
--
作者：
Dickinson, Calum;Zhou, Wuzong;He, Heyong
以介孔SiO2 SBA-15和KIT-6为模板制备了Cr（2）O（3）和Co（3）O（4）多孔单晶。在晶体生长的不同阶段的样品，其特征在于使用XRD和高分辨率透射电子显微镜。最终产物的氧化物多孔单晶体也通过氮吸附/脱附实验进行了表征。最终可以建立多种子形成机制。目前的研究表明，在SBA-15和KIT-6中的原始介观结构被氧化物晶体负复制，因此，氧化物多孔晶体中的结构单元（纳米棒或纳米线）的尺寸取决于二氧化硅的孔径。有人还发现，中孔系统，被视为一个纳米反应器，产生的氧化物颗粒的大小和形态，并对路线和结晶温度有显着的影响。
Porous single crystals of Cr(2)O(3) and Co(3)O(4) templated by mesoporous silicas, SBA-15 and KIT-6, have been fabricated. Specimens at different stages of crystal growth were characterized by using XRD and high-resolution transmission electron microscopy. The final products of oxide porous single crystals were also characterized by nitrogen adsorption/desorption experiments. A multiseed formation mechanism can eventually be established. The present investigation revealed that the original mesostructures in SBA-15 and KIT-6 were negatively replicated by the crystals of oxides, and therefore, the dimension of the building blocks (nanorods or nanowires) in the porous crystals of oxides depends on the pore diameter of the silica. It was also found that a mesopore system, regarded as a nanoreactor, had a significant influence on the size and morphology of produced oxide particles and on the route and temperature of the crystallization.