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Laser-induced growth of YVO4:Eu3+ nanoparticles from sequential flowing aqueous suspension

机译：顺序流动的水悬浮液的激光诱导YVO 4 ：Eu 3 + 纳米粒子的生长

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摘要

Ligand-free lanthanide ion-doped oxide nanoparticles have critical biological applications. An environmentally friendly and chemically green synthesis of YVO4:Eu3+ nanoparticles with high crystallinity is achieved using a physical method, laser irradiation from sequential flowing aqueous suspension in a free liquid reactor. The fabricated nanoparticles have an ovoid or spindle shape depending on the number of laser irradiation cycles. A transmission electron microscopy study showed that spindle-like particles are single-crystalline with high crystallinity, which is beneficial for high luminescence efficiency. Strong light emission even from a single particle was confirmed by cathodoluminescence mapping. A possible mechanism of nanoparticle formation was proposed as follows. Primary nanocrystals were produced from the plasma plume and self-assembled into ovoid-like nanoparticles via oriented attachment. After several cycles of laser irradiation, we observed spindle-like nanoparticles that were much longer than the ovoid-like particles. The spindle-like nanoparticles grew as a result of the diffusion and coalescence of the ovoid-like nanoparticles during repetitive laser irradiation. These findings provide useful information for the formation of ligand-free luminescent nanoparticles with different sizes based on YVO4.
机译：无配体镧系元素离子掺杂的氧化物纳米颗粒具有重要的生物学应用。使用高结晶度的YVO 4 ：Eu 3 + 纳米粒子的环保，化学绿色合成物理方法是从自由液体反应器中依次流动的水悬浮液中进行激光照射。根据激光照射循环的次数，所制造的纳米颗粒具有卵形或纺锤形。透射电子显微镜研究表明纺锤状颗粒是具有高结晶度的单晶，这有利于高发光效率。通过阴极发光映射确认了甚至来自单个颗粒的强发光。提出了一种可能的纳米颗粒形成机理。从等离子体羽产生初级纳米晶体，并通过定向附着将其自组装成卵形纳米颗粒。经过几次激光照射循环后，我们观察到纺锤状的纳米粒子比卵形的粒子长得多。纺锤状的纳米颗粒由于在重复激光照射期间卵形的纳米颗粒的扩散和聚结而生长。这些发现为YVO 4 的不同尺寸的无配体发光纳米粒子的形成提供了有用的信息。

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