在埃洛石纳米晶体存在下产生的$α$ $_2$ O $_3$的增强的OSL发射
Enhanced OSL emission from $α$-Al$_2$O$_3$ produced in the presence of halloysite nanocrystals
摘要：
本文以埃洛石纳米晶为晶种，采用燃烧法合成了$α$ -Al $_2$ O $_3$，并分析了样品的辐射发光（RL）、热释光（TL）和光释光（OSL）等剂量学特性。SEM图像和XRD都指出埃洛石纳米管充当异相成核种子。RL光谱表明由于来自前体的杂质而存在Cr $^{3+}$离子。然而，除了充当成核种子，埃洛石纳米管仍然能够吸附Cr $^{3+}$离子，如由归因于Cr $^{3+}$发光中心的RL发射降低所证明的。随着HNT含量的增加，TL强度降低，RL数据表明Cr $^{3+}$离子作为发光中心强烈参与TL发射过程。令人惊讶的是，具有HNT的样品显示出高达6倍的OSL面积强度增强和69倍的OSL初始强度增强，这表明，通过清除Cr $^{3+}$，HNT消除了与OSL发射竞争的发光中心。因此，HNT是提高$α$ O $_3$剂量计灵敏度的有前景的纳米材料，在医学物理学中具有潜在的应用，揭示了HNT在Al $_2$ O $_3$中的存在降低了竞争发光中心的密度并增加了OSL强度。
英文摘要：
This paper developed a seed-mediated synthesis of $α$-Al$_2$O$_3$ by the combustion method using halloysite nanocrystals as seeds and analyzed the dosimetric characteristics of these samples, including radioluminescence (RL), thermoluminescence (TL), and optically stimulated luminescence (OSL). Both SEM images and XRD pointed to the halloysite nanotubes acting as heterogeneous nucleation seeds. RL spectra indicate the presence of Cr$^{3+}$ ions due to impurities from the precursors. However, besides acting as nucleation seeds, the halloysite nanotubes were still able to adsorb the Cr$^{3+}$ ions, as evidenced by the decreased RL emission attributed to the Cr$^{3+}$ luminescent centers. Decreased TL intensity upon increasing HNT content together with the RL data suggested that the Cr$^{3+}$ ions have strong participation in the TL emission process as a luminescent center. Surprisingly, the samples with HNT showed up to 6-fold enhanced OSL area intensity and 69-fold OSL initial intensity enhancement, revealing that, by scavenging Cr$^{3+}$, the HNT eliminated a luminescent center that competes with the OSL emission. Therefore, HNTs are promising nanomaterial to enhance the sensitivity of $α$-Al$_2$O$_3$ dosimeters with potential application in medical physics, revealing that the presence of HNT in Al$_2$O$_3$ decreased the density of competing for luminescent centers and increased OSL intensity.
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