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 nanome...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.展开更多
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 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.展开更多
文摘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.
文摘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.
