NaYF_(4)∶Yb^(3+),Tm^(3+)稀土掺杂上转换纳米材料的制备与条件优化

Preparation and Optimization of Rare Earth Doped Upconversion Nanoparticles NaYF_(4)∶Yb^(3+),Tm^(3+)

利用溶剂热法制备油相NaYF_(4)∶Yb^(3+),Tm^(3+),经“超声去油”后得到水相NaYF_(4)∶Yb^(3+),Tm^(3+),并对稀土离子掺杂比例、反应温度、反应时间和油酸体积分数进行条件优化,通过X-射线衍射(XRD)、透射电子显微镜(TEM)、扫描电子显微镜(SEM)和分子荧光光谱仪(MFS)对其进行表征。结果表明,当稀土离子掺杂比例为NaYF_(4)∶25%Yb^(3+),0.3%Tm^(3+),反应时间为60 min,反应温度为300℃,油酸体积分数为20.6%时,合成的水相NaYF_(4)∶Yb^(3+),Tm^(3+)为六方晶型结构,六边形两平面间的平均粒径大小约为50 nm,形貌均匀、尺寸均一、分散性良好,980 nm近红外光激发下,在452和478 nm处荧光强度最大,且发出明亮的蓝色荧光。水相NaYF_(4)∶Yb^(3+),Tm^(3+)的成功制备为其后续在细胞成像、生物传感以及检测方面的应用奠定了基础。

Oil phase NaYF_(4)∶Yb^(3+),Tm^(3+)nanoparticles were prepared by solvothermal method,and aqueous phase NaYF_(4)∶Yb^(3+),Tm^(3+)nanoparticles were obtained after ultrasonic deoiling.The doping ratio of rare earth ions,reaction temperature,reaction time and volume fraction of oleic acid were optimized.The nanoparticle were characterized by X-ray diffraction(XRD),transmission electron microscope(TEM),scanning electron microscope(SEM)and molecular fluorescence spectrometer(MFS).The results showed that when the doping ratio of rare earth ions was NaYF_(4)∶25%Yb^(3+),0.3%Tm^(3+),the reaction time was 60 min,the reaction temperature was 300℃and the volume fraction of oleic acid was 20.6%,the synthesized aqueous phase NaYF_(4)∶Yb^(3+),Tm^(3+)was hexagonal crystal structure,The average particle size between the two planes of the hexagon was about 50 nm,the morphology was uniform,the size was uniform,and the dispersion was good.Under the excitation of 980 nm near infrared light,the fluorescence intensity was the highest at 452 and 478 nm and emitted bright blue fluorescence.The successful preparation of aqueous phase NaYF_(4)∶Yb^(3+),Tm^(3+)lays a foundation for subsequent applications in cell imaging,biosensor and detection.