晶体自范性和自生成模板法结合生长组装多级纳米结构  

The combination of self-produced template methodology and self-limitation properties of target materials towards three-dimensional hierarchical nanostructures

作　　者：谢毅[1] 杜永芳[1] 肖夏[1] 吴长征[1] 

机构地区：[1]中国科学技术大学化学与材料科学学院,安徽合肥230026

出　　处：《中国科学技术大学学报》2008年第6期569-575,共7页JUSTC

基　　金：国家自然科学基金委创新研究群体科学基金(20621061)资助

摘　　要：概述了一种三维纳米结构的组装新方法,即结合利用晶体生长自范性特点和自生成模板法合成三维多级纳米结构.该新方法具有方便、可控和无后处理等优点.例如,通过金红石相TiO2的链状晶体结构特点获得其纳米结构单元,同时利用反应中的自生成氧气气泡模板作为纳米结构单元的支撑,成功得到了高产率的二氧化钛空心多级纳米结构.利用新物相VOOH层状晶体结构的特性来获得片状纳米单元,同时利用反应中的氮气模板对纳米结构单元的支撑作用,组装得到了这种新相物质的三维空"蒲公英"状片层组装结构.还利用钛酸H2Ti2O5晶体结构层状的特点并以自生成模板TiOxCl2-2x(EN)y作为钛酸纳米结构单元的支撑,获得了纳米片组装的钛酸多级纳米结构.A novel way to grow and assemble three-dimensional （3D） hierarchical nanostructures was described, where the combination of the self-produced template methodology and the self-limitation properties of the functional inorganic material＇s crystal were conducted in the reaction processes. The whole reaction process was simple, controllable and without the complicated post-treatment by the utilization of this strategy. Here, the futile TiO2 3D hollow nanostructures could be achieved with a new simple chemical synthetic methodology. It was believed that the formation of futile nanorods is actually the outward embodiment of the nature of the initial crystal structure, while the newly born O2 gas bubbles acted as the support for the construction of rutile TiO2 3D hollow nanostructures. Furthermore, VOOH hollow ＂dandelions＂ were synthesized owing to the planar sheet nature of the building blocks in the newphased VOOH and the in-situ produced N2 gas bubbles as the templates that acted as the sheet-like nanounits＇ supporter. Also, titanate 3D tubular hierarchitectures were successfully prepared undergoing the self-produced template methodology coupled with precursor templating approach based on the similar strategy. The appearance of titanate nanoflakes is actually the outward embodiment of the internal crystal structure, while the sacrificed templating effect of the intermediate precursor of TiOxCl2-2x （EN）y is well understood.

关 键 词：晶体生长 自范性 自生成模板法 三维多级纳米结构 晶体结构 

分 类 号：O611.4[理学—无机化学]