Impact of surface coating on morphological, optical and photoluminescence properties of YF3：Tb^3＋ nanoparticles

作     者：Anees A.Ansari 

作者机构：King Abdullah Institute for Nanotechnology King Saud University Riyadh 11451 Saudi Arabia 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2017年第28卷第3期

页      面：651-657页

核心收录：

学科分类：081702[工学-化学工艺] 07[理学] 070205[理学-凝聚态物理] 08[工学] 0817[工学-化学工程与技术] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：funded byNational Plan for Science,Technology and Innovation(MAARIFAH) King Abdulaziz City for Science and Technology,Kingdom of Saudi Arabia,award number(No.13-Bio1246-02) 

主　　题：Yttrium fluoride Silica shell Luminescent nanoparticles Absorption spectra Energy band gap Emission spectra 

摘      要：A simple polyol and sol–gel Stober process were employed for synthesis of YF_3：Tb~＋（core）, YF_3：Tb~＋@LaF_3（core/shell） and YF_3：Tb~＋@LaF_3@SiO_2（core/shell/SiO_2） nanoparticles（NPs）. The phase purity, crystalinity,morphology, optical and photoluminescence properties were investigated and discussed with the help of various analytical techniques including X-ray diffraction pattern,FE-transmission electron microscopy（TEM）,FTIR, UV/vis absorption, energy band gap and emission spectra. XRD andFE-TEM studies indicate the formation of core/shell nanostructure and ~10 nm thick amorphous silica surface coating surrounding the core-NPs, which is also confirmed byFTIR spectral results. The surface modifications of core-NPs significantly affect the optical features in the form of energy band gap, which were correlated with particle size of the nanomaterials. The comparative emission spectral results show that after inert layer coating the luminescent core-NPs display stronger emission intensity in respect to core and silica coated core/shell/SiO_2-NPs. The solubility character along with colloidal stability was improved after silica surface modification, whereas luminescent intensity was suppressed causing the surface functionalized with high energy silanol（Si-OH） molecules. These novel luminescent nanomaterials with enhanced emission intensity and excellent solubility in aqueous solvents would be potentially useful for fluorescence bioimaging/optical bio-probe etc.