Synthesis and characterization of (3-Aminopropyl)trimethoxy-silane (APTMS) functionalized Gd2O3:Eu3+ red phosphor with enhanced quantum yield

被引：34
作者：
Jain, Akhil [1 ]
Hirata, G. A. [2 ]
Farias, M. H. [2 ]
Castillon, F. F. [2 ]
机构：
[1] Ctr Invest Cient & Educ Super Ensenada, Posgrad Fis Mat, Carretera Ensenada Tijuana 3918, Ensenada 22860, Baja California, Mexico
[2] Univ Nacl Autonoma Mexico, Ctr Nanociencias & Nanotecnol, Km 107 Carretera Tijuana Ensenada, Ensenada 22860, Baja California, Mexico
来源：
NANOTECHNOLOGY | 2016年 / 27卷 / 06期
关键词：
nanophosphor; surface functionalization; (3-aminopropyl) trimethoxysilane; quantum yield; LUMINESCENCE PROPERTIES; PHOTOLUMINESCENCE PROPERTIES; SILICA NANOPARTICLES; SURFACE MODIFICATION; DRUG-DELIVERY; SIZE; BEADS; DOTS;
D O I：
10.1088/0957-4484/27/6/065601
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
We report the surface modification of nanocrystalline Gd2O3:Eu3+ phosphor by (3-Aminopropyl) trimethoxysilane (APTMS). The nanoparticles were first coated with silica using the Stober process, and then annealed at 650 degrees C for 2 h. Afterwards, APTMS was functionalized onto the silica layer to obtain Gd2O3:Eu3+ nanoparticles bearing amine groups on the surface. The effect of silica coating, and the subsequent annealing process on the crystallization of the nanophosphor were analyzed by x-ray diffraction (XRD). High-resolution transmission electron microscopy (HR-TEM) confirmed the presence of a silica layer of similar to 45 nm thickness. X-ray photoelectron (XPS) and Fourier transform infrared (FTIR) spectroscopy confirmed the presence of silica and the amine groups. Photoluminescence (PL) analysis demonstrated an increased emission after functionalization of nanoparticles. Absolute quantum yield (QY) measurements revealed an 18% enhancement in QY in functionalized nanoparticles compared with unmodified nanoparticles, which is of great importance for their biomedical applications.
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页数：12
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