铈在六方介孔氧化硅中的液相移植及原子荧光特性

SOLUTION-PHASE GRAFTING OF CERIUM IN HEXAGONAL MESOPOROUS SILICAS AND ATOMIC FLUORESCENCE CHARACTERISTICS

采用液相移植法制备了Ce掺杂六方介孔氧化硅材料,并用X射线衍射、透射电镜、Fourier变换红外光谱、N2吸附、热失重–差热分析、X射线光电子能谱和原子荧光光谱等测试手段研究了合成材料的介孔结构、Ce的化学态及原子荧光特征。结果表明:Ce引入后的介孔氧化硅材料仍保持了六方介孔结构。合成材料中的Ce4+经Si—O—Ce键合于介孔氧化硅的孔表面,进而引发绿色荧光发射强度显著增强且明显蓝移。红外光谱中,在960cm–1处的谱带强度相对于800cm–1处的增强证明了Ce的成功引入。

Cerium in hexagonal mesoporous silicas （HMS） was synthesized with the solution-phase grafting method. The mesostructure, surface chemical state and atomic fluorescence characteristic of the products were investigated by X-my diffraction patterns, transmission electronic microscope, Fourier-transform infrared （FTIR） spectra, N2 adsorption, thermogravimetric-differential scanning calorimetry, X-ray photoelectron spectroscopy, and atomic fluorescence spectra. The results show that a hexagonal mesostructure is kept well in HMS material. With the synthesis method, Si-O-Ce cross-linking bonds are formed after doping with Ce^4＋, which enhance the intensity of green atomic fluorescence-emission and cause a notable blue shift of the green emission peak. The increase of the intensity at waveband of 960 cm^-1 compared with that of 800 cm^-1 in the FTIR spectra is the evidence indicating that cerium was doped successfully.