The luminescent nanosized Eu-MCM （1：10） was synthesized by means of sol-gel-assisted self-assembly under basic conditions at room temperature. The results of ^29Si-MAS NMR show that the peaks are Q^4, Q^3, Q^2[ （...The luminescent nanosized Eu-MCM （1：10） was synthesized by means of sol-gel-assisted self-assembly under basic conditions at room temperature. The results of ^29Si-MAS NMR show that the peaks are Q^4, Q^3, Q^2[ （SiO）4-mSi - （OH）m（m=0, 1, 2）, at -δ111, -δ103, -δ90], and q^3, q^2, q^1, q^0[（SiO）4-nSi-（O-Eu）n（n=1, 2, 3, 4）, at - δ83, - δ72, - δ55, - δ47]. The result proves Eu^3＋ doped Si - O framework. The HRTEM image shows that the regular uniform nanoparticles with a diameter of 15 nm possess large pore with Ф8 nm, which is consistent with the result of N2 adsorption. The patterns of selected-area electron diffraction, XRD, and pore-size distribution plot of Eu-MCM （ 1 ： 10） show that the sample of Eu-MCM （ 1 ： 10） possesses the both of crystal and amorphous phases. The FT IR results indicate that the peaks near 970 cm^-1 are assigned to the deformation vibration of silanol group. The as-product was calcined at 800 ℃ and the mesoporous material possesses enormous specific areas and large pores, which shows that the mesoporous material is ultrastable.展开更多
基金Project supported by Appropriative Research Fund for Professor and Doctor , Guangdong Institute of Education (ARF0406)
文摘The luminescent nanosized Eu-MCM （1：10） was synthesized by means of sol-gel-assisted self-assembly under basic conditions at room temperature. The results of ^29Si-MAS NMR show that the peaks are Q^4, Q^3, Q^2[ （SiO）4-mSi - （OH）m（m=0, 1, 2）, at -δ111, -δ103, -δ90], and q^3, q^2, q^1, q^0[（SiO）4-nSi-（O-Eu）n（n=1, 2, 3, 4）, at - δ83, - δ72, - δ55, - δ47]. The result proves Eu^3＋ doped Si - O framework. The HRTEM image shows that the regular uniform nanoparticles with a diameter of 15 nm possess large pore with Ф8 nm, which is consistent with the result of N2 adsorption. The patterns of selected-area electron diffraction, XRD, and pore-size distribution plot of Eu-MCM （ 1 ： 10） show that the sample of Eu-MCM （ 1 ： 10） possesses the both of crystal and amorphous phases. The FT IR results indicate that the peaks near 970 cm^-1 are assigned to the deformation vibration of silanol group. The as-product was calcined at 800 ℃ and the mesoporous material possesses enormous specific areas and large pores, which shows that the mesoporous material is ultrastable.
