Structural and spectroscopic studies of LaPO4:Ce/Tb@LaPO4@SiO2 nanorods: Synthesis and role of surface coating |
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| Affiliation: | 1. Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials, College of Materials Science and Engineering, North China University of Science and Technology, Tangshan 063009, China;2. School of Materials Science and Engineering, Tongji University, Shanghai 200092, China;3. School of Pharmacy, North China University of Science and Technology, Tangshan 063009, China;1. Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology (EBEAM), Yangtze Normal University, Chongqing 408100, China;2. School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105, China;3. Institute for Coordination Bond Engineering, China Jiliang University, Hangzhou 310018, China;4. Institute of Nanosurface Science and Engineering, Shenzhen University, Shenzhen 518060, China;5. NOVITAS, Nanyang Technological University, 639798, Singapore;1. Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Food Engineering, Changsha University of Science & Technology, Changsha, 410114, PR China;2. Science and Technology on Advanced Ceramic Fibers & Composites Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, PR China;1. Department of Chemistry, Zakir Husain Delhi College, University of Delhi, Delhi 110002, India;2. Department of Physics, National Taiwan University, Taipei 10617, Taiwan, ROC;3. Materials Science and Technology Division, CSIR–National Institute for Interdisciplinary Science and Technology, Thiruvananthapuram, Kerala 695019, India;4. Department of Applied Chemistry, School of Vocational Studies and Applied Sciences, Gautam Buddha University, Greater Noida, Gautam Budh Nagar, 201312, India;5. Materials Chemistry Group, Department of Chemistry, University of Delhi, Delhi 110007, India;1. Aix Marseille Univ., Univ. Avignon, CNRS, IRD, IMBE, Marseille, France;2. Aix Marseille Univ., CNRS, ICR, Case 551, 13397 Marseille, France;3. Vorozhtsov Novosibirsk Institute of Organic Chemistry Office 312, 9 Prospect Academican Laurentiev, 630090 Novosibirsk, Russia;4. Sartorius Stedim FMT S.A.S, Z.I. Les Paluds, Avenue de Jouques CS91051, 13781 Aubagne Cedex, France;1. College of Chemistry and Environmental Science, Key Laboratory of Medicine Chemistry and Molecular Diagnosis, Ministry of Education, Hebei University, No. 180 Wusi Road, Baoding 071002, PR China;2. Medical Experimental Centre of Hebei University, No. 342 Yuhua Road, Baoding 071000, PR China |
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| Abstract: | Highly fluorescent LaPO4:Ce/Tb@LaPO4@SiO2 (core/shell/Si) nanorods(NRs) were fabricated with an average length 100 nm by co-precipitation process at low temperature. X-ray diffraction (XRD), Transmission electron microscopy (TEM), energy dispersive X-ray analysis, Fourier transform infrared, optical absorption and photoluminescence spectral techniques were applied to investigate the crystal structure, phase purity, morphology, surface chemistry and optical properties of the as-prepared samples. XRD results confirmed the formation of highly crystalline with single phase, monoclinic type structure. TEM image illustrates the poly-dispersed, narrow size distributed, irregular size rod-shaped nanostructures, with mean diameters of 20 nm and average lengths up to 140 nm. FTIR spectral analysis confirmed the silica surface modification. The comparative emission spectral study shows highest luminescence intensity of core/shell NRs, due to a reduction in nonradiative transition rate. The emission intensity enhancement proves that growing of an inert LaPO4 layer on the surface of luminescent core-NRs was an effective way to suppress surface related quenching mechanism. These well crystalline, highly aqueous soluble along with extraordinary colloidal stability core/shell/Si NRs were extremely suitable material in fluorescent bio-labeling applications. |
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| Keywords: | Lanthanum phosphate Silica shell Vibrational spectra Optical absorption Photoluminescence |
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