有序介孔SBA-15紫外光致发光机理研究  

Ultraviolet photoluminescence from SBA-15 ordered mesoporous silica

作　　者：徐海涛[1] 王玉霞[1] 赵磊[1] 

机构地区：[1]中国科学技术大学材料科学与工程系,安徽合肥230026

出　　处：《中国科学技术大学学报》2010年第1期58-61,共4页JUSTC

基　　金：国家自然科学基金(50672095)资助

摘　　要：用水热法制备出了有序介孔二氧化硅SBA-15,分别在室温下进行了光致发光(PL)和电子顺磁共振(EPR)分析.室温PL谱分析发现了位于3.8 eV的紫外光致发光峰,进一步研究发现,样品在空气中静置十天后,3.8 eV的发光峰强度会增强.通过样品在不同温度下的退火试验分析并结合EPR谱,对这一发光的机理给予了解析,认为可能是介孔二氧化硅SBA-15中的ODC(Ⅱ)(≡Si…Si≡)缺陷与介孔中吸附的水分子反应形成的硅醇基(≡Si—OH)产生的发光.An ultraviolet photoluminescence emission band at 3.8 eV was found from SBA-15 ordered mesoporous silica prepared by means of the hydro-thermal method.The optical properties of such material were investigated by electron paramagnetic resonance（EPR） and photoluminescence（PL） spectra at room temperature.It was found that the PL intensity of the sample at 3.8 eV was enhanced after exposition in air at room temperature for 10 days.Besides,annealing experiments at different temperatures were used to study the origin of the observed PL emission band.The 3.8 eV band is suggested to be attributed to the surface silanols generated from ODC（Ⅱ）（unrelaxed neutral oxygen vacancy） and the interstitial water molecules.

关 键 词：有序介孔二氧化硅 SBA-15 硅醇基 ODC(Ⅱ) 间隙水 

分 类 号：O482[理学—固体物理]