Structural and Optical Characterization of Silica Nanospheres Embedded with Monodisperse CeO2-Eu3+ Nanocrystals

被引:1
作者
Secu, Corina [1 ]
Bartha, Cristina [1 ]
Matei, Elena [1 ]
Radu, Cristian [1 ,2 ]
Secu, Mihail [1 ]
机构
[1] Natl Inst Mat Phys, Atomistilor 405A, Magurele 077125, Romania
[2] Univ Bucharest, Fac Phys, Atomistilor 405, Magurele 077125, Romania
关键词
CeO2; europium; silica spheres; nanocrystals; electron microscopy; luminescence; PHOTOLUMINESCENCE PROPERTIES; CEO2; SPHERES; EU3+;
D O I
10.3390/magnetochemistry8020022
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
Luminescent nanocrystals embedded into silica microspheres were shown to be useful for silica labeling for biological applications, ensuring mechanical and chemical stability, nontoxicity, biocompatibility and optical properties. We used sol-gel technology to prepare silica nanospheres embedded with fluorescent and magnetic Eu3+(1 mol%)-doped CeO2 nanocrystals. The X-ray diffraction pattern analysis and transmission electron microscopy investigations showed CeO2:Eu3+(1 mol%) nanocrystals of about 9 nm size and Ce3+ ions substitution by the Eu3+ ions; the nanocrystals dispersed inside the nanosized silica spheres of about 400 nm diameters. The photoluminescence spectra recorded under UV-light excitation showed Eu3+ ions luminescence peaks (D-5(0)-F-7(J), J = 0-4) accompanied by a weaker 425 nm luminescence due to the silica matrix; the quantum yield was 0.14. The weak hysteresis loop and magnetization curves recorded up to 20,000 Oe showed dominantly paramagnetic behavior associated with the silica matrix; a slight opening of the hysteresis loop to a very small magnetic field (about 0.005 Oe) was due to the presence of the two rare earth ions. The photonic crystal properties of SiO2-CeO2:Eu3+(1 mol%) silica nanospheres deposited as films on quartz plates were revealed by the two weak attenuation peaks at 420 and 500 nm and were associated with the reflection from different planes. The SiO2-CeO2:Eu3+(1 mol%) nanospheres are attractive potential candidates for photonics-related applications or for multifunctional bio-labels by combining the luminescence and magnetic properties of the nanocrystals.
引用
收藏
页数:10
相关论文
共 28 条
  • [11] ICDD, 2011, POWDER DIFFRACTION F
  • [12] Effect of Iron Impurities on Magnetic Properties of Nanosized CeO2 and Ce-Based Compounds
    Jiraskova, Yvonna
    Bursik, Jiri
    Janos, Pavel
    Lunacek, Jiri
    Chrobak, Artur
    Zivotsky, Ondrej
    [J]. METALS, 2019, 9 (02)
  • [13] Unusual lattice evolution and magnetochemistry of Nb doped CeO2
    Kolodiazhnyi, T.
    Sakurai, H.
    Belik, A. A.
    Gornostaeva, O. V.
    [J]. ACTA MATERIALIA, 2016, 113 : 116 - 123
  • [14] Dependence of charge transfer energy on crystal structure and composition in Eu3+-doped compounds
    Li, Ling
    Zhang, Siyuan
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2006, 110 (43) : 21438 - 21443
  • [15] Photoluminescence Properties of CeO2:Eu3+ Nanoparticles Synthesized by a Sol-Gel Method
    Li, Ling
    Yang, Hyun Kyoung
    Moon, Byung Kee
    Fu, Zuoling
    Guo, Chongfeng
    Jeong, Jung Hyun
    Yi, Soung Soo
    Jang, Kiwan
    Lee, Ho Sueb
    [J]. JOURNAL OF PHYSICAL CHEMISTRY C, 2009, 113 (02) : 610 - 617
  • [16] Synthesis and photoluminescence of CeO2:Eu3+ phosphor powders
    Liu, Xiaohua
    Chen, Shaojun
    Wang, Xiaodong
    [J]. JOURNAL OF LUMINESCENCE, 2007, 127 (02) : 650 - 654
  • [17] Lutterotti L., 1999, Proceeding of the Twelfth International Conference on Textures of Materials (ICOTOM-12), V1, P1599, DOI DOI 10.1063/1.364220
  • [18] Miguez H, 1997, APPL PHYS LETT, V71, P1148, DOI 10.1063/1.119849
  • [19] Fundamentals and Catalytic Applications of CeO2-Based Materials
    Montini, Tiziano
    Melchionna, Michele
    Monai, Matteo
    Fornasiero, Paolo
    [J]. CHEMICAL REVIEWS, 2016, 116 (10) : 5987 - 6041
  • [20] Synthesis, structural and optical properties of CeO2 nanoparticles synthesized by a simple polyvinyl pyrrolidone (PVP) solution route
    Phoka, Sumalin
    Laokul, Paveena
    Swatsitang, Ekaphan
    Promarak, Vinich
    Seraphin, Supapan
    Maensiri, Santi
    [J]. MATERIALS CHEMISTRY AND PHYSICS, 2009, 115 (01) : 423 - 428