纳米ZrO_2/(1-n)SiO_2-nAl_2O_3介孔复合作的制备与光致发光  

Preparation and Photoluminescence of Mesoporous ZrO_2/(1-n)SiO_2-nAl_2O_3 Nanocomposites

作　　者：姚连增[1] 牟季美[1] 李远红[1] 蔡维理[1] 

机构地区：[1]中国科学技术大学材料科学与工程系,合肥230026

出　　处：《无机材料学报》1998年第6期859-865,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金!1967405;攀登计划资助!920305

摘　　要：采用溶胶-凝胶法和超临界干燥技术制备了（1－n）SiO2－nAl2O3（n=0、001、0.1）混合气凝胶体系，并以此作为载体，成功地将纳米ZrO2粒子组装到（1—n）SiO2－nAl2O3介孔体系中，而形成纳米ZrO2／（1—n）SiO2－nAl2O3介孔复合材料．光致发光光谱研究表明，室温下以316um（392eV）波长激发时，纳米ZrO2粒子540um（230eV）荧光峰，在介孔复合体中将蓝移至400um（310eV）左右，蓝移量140um；其光致荧光峰的相对强度亦随Al2O3的掺入量不同而不同．对产生上述光谱性质变化的机理进行了初步探讨．(1--n)SiO2-nAl2O3 (n=0, 0.01, 0.1) aerogels were prepared by using a sol-gel route and followed by the supercritical drying technique. Nano-ZrO2 precipitates were introduced into thepores of the aerogels. Photoluminescence of the ZrO2/ (1--n)SiO2-nAl2O3 nanocomposites wasmeasured. The results show that the luminescence peak at about 540um (2.30eV) for nano-ZrO2bulk sample shifts to 400urn (3.10eV) (blue shift) for ZrO2/(1--n)SiO2-nAl2O3 nanocomposites,when the excitation wavelength is 316um (3.92eV) at room temperature. The blue shift is about140um. The relative intensities of the luminescence peak change with the doping amount of thenano-Al2O3. Mechanism of change of the luminescence peak in the visible region was proposed.

关 键 词：复合体 气凝胶 光致发光 氧化锆 氧化硅 氧化铝 

分 类 号：TB331.03[一般工业技术—材料科学与工程]