NaYF_4∶Yb,Er/氧化石墨烯纳米复合材料的制备、表征及上转换发光性能  

Preparation,Characterization and Upconversion Fluorescence of NaYF_4∶Yb,Er /Graphene Oxide Nanocomposites

作　　者：嵇天浩[1] 郄楠[1] 王继梅[2] 滑永永[1] 冀志江[2] 

机构地区：[1]北京工商大学理学院,北京100048 [2]中国建筑材料科学研究总院环境功能材料研究室,北京100024

出　　处：《光谱学与光谱分析》2013年第3期642-646,共5页Spectroscopy and Spectral Analysis

基　　金：国家"十二五"支撑计划项目(2012BAJ02B08);北京工商大学高层引进人才项目资助

摘　　要：采用"一锅"和直接混合两种制备过程,制得了NaYF4∶Yb,Er/氧化石墨烯(rGO)和SiO2包覆NaYF4∶Yb,Er/rGO两系列纳米复合材料。各种测试结果表明,NaYF4∶Yb,Er是以α型立方结构和纳米粒子形状存在于复合材料中,粒径主要在30～70nm间,而rGO则较好地分散在其中,但"一锅"法制得的rGO呈现更好的分散性。Raman光谱证实,在这两种纳米材料之间存在表面耦合相互作用,且随着rGO相对含量增大,它们之间接触面积逐渐增多,相互作用也逐渐增强。上转换发光测试结果表明,rGO具有很好的发光猝灭效应和光限幅现象,尤其是对NaYF4∶Yb,Er的红光带影响更加显著。随着rGO相对含量逐渐增加,红光带发光强度逐渐降低,而绿光带变化不大。对于使用不同方法制备的样品,在具有相似含量情况下,由于团聚rGO具有更强的吸光作用,SiO2包覆样品的红光带发光强度受到rGO影响更大。NaYF4∶Yb,Er/rGO and SiO2-coated NaYF4∶Yb,Er/rGO nanocomposites can be prepared through ＂one-pot＂ and directly mixing preparation routes.Various measurement results show that the NaYF4∶Yb,Er in the nanocomposites exhibits a cubic α-type structure and nanoparticle-like morphology with a diameter range of 30~70 nm;the rGO layers are well-dispersed in the nanocomposites,and whereas the rGO obtained from ＂one-pot＂ preparation renders relatively better dispersion.Raman spectra demonstrate that there exists a surface coupling action between the two kinds of nanomaterials,and with the increase in the relative rGO content,such action becomes stronger.UC fluorescence measurement results reveal that the rGO has significantly quenching effect and optical-limiting performance on the UC fluorescence,particularly on the red-emission of the NaYF4∶Yb,Er or SiO2-coated NaYF4∶Yb,Er nanoparticles.The red-emission intensity gradually decreases with an increase in the rGO content,but the green-emission shows less change.It should be stressed that in comparison with NaYF4∶Yb,Er/rGO,with a similar rGO content,the red-emission intensity of SiO2-coated NaYF4∶Yb,Er/rGO decreases much obviously due to a stronger light-absorption caused by part rGO aggregation.

关 键 词：纳米复合材料 氧化石墨烯 NaYF4∶Yb Er 上转换发光 光限幅 

分 类 号：TB383[一般工业技术—材料科学与工程]