液相二氧化钛纳米微粒的荧光和共振散射光谱特性

Fluorescence and Resonance Scattering Spectral Properties of TiO_2 Nanoparticle in Water Phase

以钛酸四丁酯(TBTi)为前驱体,利用微波高压反应法合成了纳米二氧化钛溶胶,并与Ti(SO4)2水解法制备出的二氧化钛纳米微粒对比。考察了两种前驱体制备的二氧化钛纳米微粒荧光光谱及共振散射光谱特性,用TBTi制备的二氧化钛纳米微粒在320 nm有一个共振散射峰,在470 nm有一个同步散射峰,在360,400和470 nm处有三个荧光发射峰;用Ti(SO4)2制备的二氧化钛纳米微粒在340 nm有个共振散射峰,在470 nm有一个同步散射峰,400和470 nm处有两个荧光发射峰。反应条件对共振散射强度的影响与其对荧光的影响变化趋势一致,但共振散射光强度较荧光强度强得多。

Nanometer-sized TiO2 sol was prepared by a microwave high-pressure method using terabuty titanate （TBTi） as a precursor, and was contrasted with the one prepared by Ti（SO4 ）2 hydrolysis method. Fluorescence and resonance scattering spectral properties of TiO2 nanoparticles prepared by the two different precursors were considered. The one using TBTi as precursor exhibits a resonance scattering peak at 320 nm, a synchrotron scattering peak at 470 nm, and three fluorescence emission peaks at 350, 400 and 470 nm, respectively. The other one prepared by Ti（SO4 ）2 has a resonance scattering peak at 340 nm, a synchrotron scattering peak at 470 nm, and two fluorescence emission peaks at 400 and 470 nm, respectively. Influences of the reaction conditions on the resonance scattering intensity are consistent with those on the fluorescence, but the resonance scattering intensity is stronger than the fluorescence intensity.