Montes E, Cerón P, Rivera Montalvo T, Guzmán J, García-Hipólito M, Soto-Guzmán A B, García-Salcedo R, Falcony C
Centro de Investigación de Ciencia Aplicada y Tecnología Avanzada, IPN, Unidad Legaria, Avenida Legaria 694 Colonia Irrigación, 11500 México D.F., México.
Appl Radiat Isot. 2014 Jan;83 Pt C:196-9. doi: 10.1016/j.apradiso.2013.06.008. Epub 2013 Jul 10.
Thermo and photoluminescent properties of nanoparticles (NPs) of hafnium oxide (HfO2), both intrinsic and doped with terbium (Tb(3+)) are reported. The NPs of HfO2 were synthesized by hydrothermal route, using hafnium tetrachloride (HfCl4) and terbium chloride hexahydrated (TbCl3∙6H2O) as precursors and sodium hydroxide (NaOH) to adjust the pH. Deionized water was used as solvent in all cases. The synthesis was carried out at different dopant concentrations from 0 to 20 at% of terbium with respect to the amount of hafnium in the precursor solution. The temperature of hydrothermal treatment was 200 °C and 80 min of reaction time. X-ray diffraction results show that at terbium concentrations higher than 15 at% the HfO2 nanoparticles have a crystalline structure corresponding to the tetragonal phase. Thermoluminescent (TL) characterization was performed after 5 min irradiation of the samples with ultraviolet light of 200 nm wavelength. The highest TL emission was observed on samples with 7 at% of Tb, with the TL peak centered at 128 °C. Thermoluminescence analysis shows behavior associated with second-order kinetics with activation energy of 0.49 eV. Photoluminescent spectrum present the characteristics (5)D4→(7)FJ (J=3-6) terbium ion electronic transitions lines centered on 489 nm, 543 nm, 584 nm and 622 nm.
报道了氧化铪（HfO₂）纳米颗粒（NPs）的热学和光致发光特性，包括本征的以及掺杂铽（Tb(3+)）的情况。采用水热法合成HfO₂纳米颗粒，使用四氯化铪（HfCl₄）和六水合氯化铽（TbCl₃∙6H₂O）作为前驱体，并用氢氧化钠（NaOH）调节pH值。在所有情况下均使用去离子水作为溶剂。合成过程是在前驱体溶液中铽的掺杂浓度相对于铪的量从0到20原子百分比的不同条件下进行的。水热处理温度为200℃，反应时间为80分钟。X射线衍射结果表明，当铽浓度高于15原子百分比时，HfO₂纳米颗粒具有对应四方相的晶体结构。在用波长为200nm的紫外光照射样品5分钟后进行热释光（TL）表征。在铽含量为7原子百分比的样品上观察到最高的TL发射，TL峰值位于128℃。热释光分析显示其行为符合二级动力学，激活能为0.49eV。光致发光光谱呈现出以489nm、543nm、584nm和622nm为中心的（5）D4→（7）FJ（J = 3 - 6）铽离子电子跃迁线特征。
