具有芳香族连接分子的YVO $_{4}$：Eu $^{3+}$纳米颗粒的光致发光光谱：生物医学功能化的前体
Photoluminescence spectroscopy of YVO$_{4}$:Eu$^{3+}$ nanoparticles with aromatic linker molecules: a precursor to biomedical functionalization
摘要：
YVO $_{4}$：Eu $^{3+}$纳米粒子的光致发光光谱，与和不连接的有机连接分子，建议用于连接到生物分子。采用湿化学法合成了掺杂浓度为5%的YVO $_{4}$：Eu $^{3+}$纳米粒子。X射线衍射和透射电子显微镜显示预期的wakefieldite结构的tetraxide颗粒的平均尺寸为17 nm。傅里叶变换红外光谱确定，金属羧酸盐配位是成功地取代天然金属羟基键与三个有机连接体，即苯甲酸，3-硝基4-氯-苯甲酸和3，4-二羟基苯甲酸，在单独的处理。紫外激发光致发光光谱表明，苯甲酸和3-硝基-4-氯-苯甲酸处理对619 nm处的$^{5}D_{0}-^{7}F_{2}$电偶极跃迁的位置和强度没有影响。3，4-二羟基苯甲酸的附着产生光致发光的数量级猝灭，这是由于连接体中存在高频模式。占主导地位的电和磁偶极跃迁的比率确认红外测量，这表明，散装晶体的纳米粒子是不变的所有三个治疗。
英文摘要：
Photoluminescence spectra of YVO$_{4}$:Eu$^{3+}$ nanoparticles are presented,with and without the attachment of of organic linker molecules that are proposed for linking to biomolecules. YVO$_{4}$:Eu$^{3+}$ nanoparticles with 5% dopant concentration were synthesized by wet chemical synthesis. X-ray diffraction and transmission electron microscopy show the expected wakefieldite structure of tetragonal particles with an average size of 17 nm. Fourier-transform infrared spectroscopy determines that metal-carboxylate coordination is successful in replacing the native metal-hydroxyl bonds with three organic linkers, namely benzoic acid, 3-nitro 4-chloro-benzoic acid and 3,4-dihydroxybenzoic acid, in separate treatments. UV-excitation photoluminescence spectra show that the position and intensity of dominant $^{5}D_{0}-^{7}F_{2}$ electric-dipole transition at 619 nm is unaffected by the benzoic acid and 3-nitro 4-chloro-benzoic acid treatments. Attachment of the 3,4-dihydroxybenzoic acid produces an order-of-magnitude quenching of the photoluminescence, due to the presence of high-frequency modes in the linker. Ratios of the dominant electric- and magnetic-dipole transitions confirm infrared measurements, which indicate that the bulk crystal of the nanoparticle is unchanged by all three treatments.
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