School of Integrative Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea.
Nanoscale. 2023 Mar 2;15(9):4604-4611. doi: 10.1039/d2nr05439f.
The development of multifunctional nanoparticles (NPs) combining individual properties, such as magnetic, luminescence, and optical properties, has attracted significant research interest. In this study, europium (Eu)-incorporating iron oxide nanoparticles (IONPs) with Eu(TTA)phen (ET-SIOPs) were successfully designed and shown to have luminescence and magnetic properties. The proposed synthetic method has three steps: (1) IONP synthesis, (2) SiO layer coating (1st coating), and (3) Eu-SiO layer coating (2nd coating). The morphology of the ET-SIOPs was well preserved after the 2nd coating was conducted. According to the photoluminescence (PL) spectra in the range of 500 to 700 nm, the Eu-incorporating SIOPs with Eu(TTA)phen (ET-SIOPs) exhibited the highest emission intensity compared to the Eu-incorporating SIOPs synthesized with other Eu precursors. Furthermore, the ET-SIOPs exhibited long-term luminescence stability of 6 months. In addition, this method of double-layer coating can be applied to other materials synthesized with different compositions and shapes, such as MnO and SiO NPs. The findings of this study will not only provide new insights for the synthesis of luminescent-magnetic NPs with long-term luminescence stability and paramagnetic properties, but can also be applied for the design of various multifunctional NPs.
多功能纳米粒子（NPs）的发展结合了个体特性，如磁性、发光和光学性质，引起了广泛的研究兴趣。在这项研究中，成功设计了掺入铕（Eu）的氧化铁纳米粒子（IONPs）与 Eu(TTA)phen（ET-SIOPs），并证明其具有发光和磁性。所提出的合成方法有三个步骤：（1）IONP 合成，（2）SiO 层涂层（第一次涂层），和（3）Eu-SiO 层涂层（第二次涂层）。在进行第二次涂层后，ET-SIOPs 的形态得以很好地保留。根据在 500 到 700nm 范围内的光致发光（PL）光谱，与用其他 Eu 前体制备的掺入 Eu 的 SIOPs 相比，掺入 Eu(TTA)phen（ET-SIOPs）的 SIOPs 表现出最高的发射强度。此外，ET-SIOPs 表现出长达 6 个月的发光稳定性。此外，这种双层涂层方法可以应用于用不同组成和形状合成的其他材料，如 MnO 和 SiO NPs。本研究的结果不仅为具有长期发光稳定性和顺磁性的发光-磁性 NPs 的合成提供了新的见解，而且还可以应用于各种多功能 NPs 的设计。
