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Effect of surface coating on structural and photophysical properties of CePO_4:Tb, nanorods

机译：表面涂层对CePO_4：Tb纳米棒的结构和光物理性质的影响

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摘要

A facile and efficient method was established for the more productive synthesis of highly fluorescent CePO_4:Tb (core) and CePO_4:Tb@LaPO_4 (core/shell) nanorods (NRs) at low temperature. Subsequently, the surface of the core/shell NRs was functionalized by silica layer (CePO_4:Tb@LaPO_4@SiO_2. core/shell/ Si) to enhance the solubility and colloidal stability character in an aqueous and non-aqueous solvent. XRD pattern shows the phase purity, crystallinity and single-crystalline nature of the hexagonal-rhabdophane type structure of NRs, which was further verified from FETEM images. TEM image shows a thin silica layer around the seed core/shell NRs. After coating of silica shell the resulting core/shell NRs have a mean diameter of about 20 nm and length up to 100 nm. The core/shell NRs demonstrate highest excitation and emission intensity, which was suppressed after silica layer coating due to enhancement in the multiphoton-relaxation process. However, core/shell/Si NRs represent high solubility in an aqueous environment on that basis it could find potential applications in photonic and photonic based biomedical sciences.
机译：建立了一种简便高效的方法，可在低温下更高效地合成高荧光CePO_4：Tb（核）和CePO_4：Tb @ LaPO_4（核/壳）纳米棒（NRs）。随后，核/壳NRs的表面通过二氧化硅层（CePO_4：Tb @ LaPO_4 @ SiO_2。核/壳/ Si）官能化，以增强在水性和非水性溶剂中的溶解性和胶体稳定性。 XRD图谱显示了NRs的六方晶型结构的相纯度，结晶度和单晶性质，这已从FETEM图像中得到进一步验证。 TEM图像显示了种子核/壳NR周围的二氧化硅薄层。涂覆二氧化硅壳后，所得核/壳NR的平均直径约为20 nm，长度可达100 nm。核/壳NRs表现出最高的激发和发射强度，由于多光子松弛过程的增强，在二氧化硅层涂布后被抑制。但是，核/壳/ Si NRs在水性环境中表现出高溶解度，因此可以在光子和基于光子的生物医学领域找到潜在的应用。

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