The silica containing vanadium oxide which can emit phosphorescence at room temperature was prepared by sol-gel method with tetraethyl orthosilicate,ammonium metavanadate.V2O5 nanocrystals were found to be embedded in the silica first time.The mechanism of phosphorescence emission is attributed to V2O5 nanocrystals.The redshift of phosphorescence was explained with the size effect of V2O5 nanocrystal.The phosphorescence quenching by aether,hyposulphite and hydrofluoric acid was observed,indicating the potential application of the silica to chemical sensor.
In this paper,the nanometer TiO2-SiO2 composite oxide,which has a higher surface area,was prepared by sol-gel.The surface area and structural property of composite oxide were examined.The results indicated that nanometer particles of the composite oxide were obtained.When nSi∶nTi ratio was equal to 4.6,the surface area was larger comparing with pure TiO2 and pure SiO2.Tris（2,2’-bipyridine） ruthenium（Ⅱ） absorbed on TiO2-SiO2 composite oxide was sensitive to oxygen.
基于豌豆叶色素乙醇溶液在蓝紫色的发光二极管(LED)照射下产生红色荧光,该红色荧光能被Hg2+熄灭的现象,建立一种简便、快速、定性鉴定溶液中Hg2+的新方法,实验证明其他阳离子基本上不产生干扰。该方法可直接从阳离子混合溶液中定性鉴定Hg2+,其检测Hg2+的最低浓度为5×10-4m o l/L,检出限为5μg。
