Villa-Sanchéz G, Mendoza-Anaya D, Gutiérrez-Wing C, Pérez-Hernández R, González-Martínez P R, Angeles-Chavez C
Instituto Nacional de Investigaciones Nucleares, Carretera México-Toluca s/n La Marquesa, Ocoyoacac, Estado de México, CP 52750, Mexico. Facultad de Química, Universidad Autónoma del Estado de México, Mexico.
Nanotechnology. 2007 Jul 4;18(26):265703. doi: 10.1088/0957-4484/18/26/265703. Epub 2007 Jun 5.
The goal of this work was to analyse ZrO(2) in the pure state and when doped with Ag nanoparticles, by electron microscopy, x-ray diffraction and thermoluminescence methods. According to the results obtained, Ag nanoparticles did not modify the morphology or the crystalline structure of the ZrO(2). The thermoluminescent (TL) response of pure ZrO(2) showed two peaks, one at 334 K and the other at 417 K, when it was exposed to ultraviolet (UV) radiation, and at 342 and 397 K when gamma radiation was used. For ZrO(2) impregnated with Ag nanoparticles a diminished TL intensity due to nanoparticle shielding was observed, but the glow curve shape was similar. However, when Ag nanoparticles were added during the ZrO(2) synthesis, a shift of the TL peaks towards higher temperature values with reference to pure ZrO(2) was observed. A linear dependence of the integrated TL signal as a function of the irradiation dose was observed in all analysed samples. It was possible to determine some kinetic parameters, such as activation energy, kinetic order and frequency factor, using the sequential quadratic programming glow curve deconvolution; it was found that these values are highly dependent on the type of radiation used. Ag nanoparticles present in ZrO(2) also modified the kinetic parameters, mainly when they were added during the synthesis of ZrO(2). Our results reinforce the possibilities of using pure and doped ZrO(2) as an appropriate dosimetric material in radiation physics.
这项工作的目标是通过电子显微镜、X射线衍射和热释光方法，分析纯净状态以及掺杂银纳米颗粒的ZrO₂。根据所得结果，银纳米颗粒并未改变ZrO₂的形态或晶体结构。纯净的ZrO₂在受到紫外线（UV）辐射时，其热释光（TL）响应显示出两个峰值，一个在334K，另一个在417K；当使用伽马辐射时，峰值分别在342K和397K。对于浸渍有银纳米颗粒的ZrO₂，由于纳米颗粒的屏蔽作用，观察到TL强度减弱，但发光曲线形状相似。然而，当在ZrO₂合成过程中添加银纳米颗粒时，相对于纯净的ZrO₂，TL峰值向更高温度值偏移。在所有分析样品中均观察到积分TL信号与辐照剂量呈线性关系。使用序列二次规划发光曲线反卷积可以确定一些动力学参数，如活化能、动力学级数和频率因子；发现这些值高度依赖于所使用的辐射类型。ZrO₂中存在的银纳米颗粒也改变了动力学参数，主要是在ZrO₂合成过程中添加它们时。我们的结果强化了将纯净和掺杂的ZrO₂用作辐射物理学中合适剂量测定材料的可能性。
