Liu Guixia, Hong Guangyan, Sun Duoxian
Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China.
J Colloid Interface Sci. 2004 Oct 1;278(1):133-8. doi: 10.1016/j.jcis.2004.05.013.
Europium-doped Gd2O3 with an average size of approximately 15 nm was coated on the surface of preformed silica nanospheres by the wet chemical method. SEM and TEM photographs showed that SiO2/Gd2O3:Eu core-shell submicrospheres are obtained. XRD patterns indicated that the Gd2O3:Eu shell is crystalline after heat treatment. FTIR and XPS spectra showed that the Gd2O3:Eu shell is linked to the silica surface by forming a Si-O-Gd bond. Photoluminescence studies showed that the luminescent properties are still retained after coating on an inert silica core; additionally, we noted that the emitting peaks are broadened, which results from size effects and interface effects of nanocrystal.
通过湿化学方法将平均尺寸约为15 nm的铕掺杂氧化钆包覆在预先形成的二氧化硅纳米球表面。扫描电子显微镜（SEM）和透射电子显微镜（TEM）照片显示获得了SiO2/Gd2O3:Eu核壳亚微球。X射线衍射（XRD）图谱表明，热处理后Gd2O3:Eu壳层是结晶的。傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）表明，Gd2O3:Eu壳层通过形成Si-O-Gd键与二氧化硅表面相连。光致发光研究表明，包覆在惰性二氧化硅核上后仍保留发光特性；此外，我们注意到发射峰变宽，这是由纳米晶体的尺寸效应和界面效应导致的。
