核壳结构纳米颗粒Gd_2O_3:Tb^(3+)/SiO_x的制备及发光性能研究

Preparation and Luminescent Properties of Core-shell Nanoparticles Gd_2O_3:Tb^(3+)/SiO_x

以二甘醇为溶剂合成Gd2O3:Tb3+纳米颗粒,并在其表面包覆聚硅氧烷层,得到核壳结构纳米颗粒Gd2O3∶Tb3+/SiOx。为了研究Tb3+离子掺杂浓度对纳米颗粒发光性能的影响,采用几种不同Tb3+掺杂浓度进行纳米颗粒的合成,并对其发光性能进行了检测。结果表明:包裹聚硅氧烷层后的Gd2O3∶Tb3+纳米颗粒分散较好,聚硅氧烷层不会减弱Gd2O3∶Tb3+纳米颗粒的发光性能。Tb3+掺杂浓度对核壳结构纳米颗粒Gd2O3∶Tb3+/SiOx的发光存在浓度猝灭现象,猝灭摩尔分数为5%。这种具有发光特性的核壳结构纳米颗粒可作为生物传感器的探针用于生物分子的检测。

Tb3 ＋ -doped Gd2O3 particles were synthesized in a polyol （diethylene glycol） medium. Core-shell nanoparticles Gd203： Tb3 ＋/SiOx were obtained by encapsulating Gd2O3：Tb3＋ in a polysi- loxane shell. In order to study the effect of Tb3＋ ion doping concentration on luminescent properties of particles, synthesis were carried out with different Tb3＋ doping concentrations, then luminescence of nanoparticles was measured. The result showed that nanoparticles Gd2O3： Tb3＋ coated by polysiloxane were well-dispersed, and polysiloxane shell did not diminish luminescence of nanoparticles Gd203： Tb3 ＋. Tb3 ＋ doping concentration effected the luminescent properties of core-shell particles Gd2O3： Tb3＋/SiOx by a quenching phenomenon when the Tb3 ＋ doping mole fractioin exceeded 5%. The luminescent core-shell nanoparticles can be used as a biosensor probe in the detection of biological molecules.