【摘要】 采用溶胶-凝胶法,以三嵌段共聚物P123(EO₂₀PO₇₀EO₂₀,M_w=5800)作为结构导向剂,正硅酸四乙酯（TEOS）作为硅源,硝酸银（AgNO₃）作为银的前躯体,制备出掺杂有银纳米颗粒的有序介孔SiO₂块体。通过小角X射线衍射（SAXRD）和高分辨透射电子显微镜（HRTEM）分析,测得掺银介孔SiO₂样品在煅烧前具有平面六方结构（空间群p6mm）,煅烧后样品结构发生收缩,但仍部分保持有序平面六方结构,孔径在3～7nm之间,平均孔直径为5.4nm,银纳米颗粒尺寸大约为5nm。掺银介孔氧化硅的气孔尺寸大于未掺银介孔氧化硅的气孔尺寸。更多还原

【Abstract】 Ag-doped ordered mesostructured silica monoliths were synthesized through a sol-gel process by using poly-（ethylene oxide）-poly（propylene oxide）-poly（ethylene oxide）amphiphilic block copolymer P123(Aldrich,EO₂₀PO₇₀EO₂₀,M_w=5800)as structure-directing agent,tetraethoxysiliane（TEOS）as silica source,and silver nitrate（AgNO₃）as silver precursor.Small angle powder X-ray diffraction（SAXRD）and high resolution transmission electron microscopy（HRTEM）indicate that the as-synthesized Ag doped mesoporous silica has a highly ordered two-dimensional hexagonal structure（space group p6mm）,the two-dimensional hexagonal structure shrinks and the region of two-dimensional hexagonal structure reduces after calcinations.The diameter of Ag nanoparticles in channels is about 5nm.The pore size of Ag doped mesoporous SiO₂ is about 5.4nm ranging from 3～7nm,which is larger than that of pure mesoporous SiO₂.更多还原