一种通过纳米粒子的组装制备基于二氧化铈中孔材料的简易方法(英文)

A Facile Approach to Mesoporous Ceria-based Materials by Assembly of Nanoparticles

用HF或者HCl作联合剂,三嵌段共聚物表面活性剂作模板剂,通过二氧化铈纳米粒子(或者过渡金属掺杂的二氧化铈纳米粒子)组装形成具有热稳定和晶化孔壁的基于二氧化铈的中孔材料。焙烧该合成的超分子模板中孔结构的材料可以形成具有高比表面的基于二氧化铈的中孔材料,这些中孔材料用不同的光谱技术表征。通过D_(2-)OH交换测得的二氧化铈表面的羟基在组装过程和中孔材料的稳定性方面至关重要。联结剂中的卤素离子(F和Cl离子)可以替代中孔材料的表面羟基,从而影响这些中孔材料的结构稳定性和光学活性,而用具有3d的过渡金属在组装前掺杂二氧化铈纳米粒子可以显著地提高中孔材料的光学活性,这种提高主要归结为通过掺杂可以促使能量转移的提高。

A facile approach to thermally stable and crystalline mesoporous ceria-based materials has been developed via assembly of ceria or transition metal doped celia nanoparticles with HF or HCl as the binding agent and a triblock copolymer surfactant as the template. High surface area mesoporous ceria-based materials were obtained by calcination of the supramolecular-templated mesostructures and were characterized by using various spectroscopic techniques. The surface OH groups of celia, quantitatively measured by D2-OH exchange, are important both for the assembly process and for the stability of the mesoporous celia. The halogen ions in the binding agents, fluorides or chlorides, can substitute the surface OH groups and affect the structural stability and the optical activities of the mesoporous ceria. The optical activity of the celia nanoparticles was significantly improved by doping with 3 d transition metals before the assembly mainly due to the enhancement of energy transfer by the doping.