Synthesis and surface modification of ultrasmall monodisperse NaYF4:Yb3+/Tm3+ upconversion nanoparticles |
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| Affiliation: | 1. Department of Chemistry, Sardar Vallabhai National Institute of Technology, Surat, 395007, Gujarat, India;2. Department of Chemistry, School of Advanced Sciences, VIT-AP University, Amaravati, 522237, Andhra Pradesh, India;3. Department of Polymer Science & Technology, Sri Krishnadevaraya University, Ananthapuramu, 515003, Andhra Pradesh, India;1. Department of Science Laboratory Technology, Delta State University, Abraka, Delta State, Nigeria;2. Department of Physics, College of Education, Warri, Delta State, Nigeria;3. Federal University of Petroleum Resources, Effurun, Delta State, Nigeria;4. Department of Physics, Delta State University, Abraka, Delta State, Nigeria;5. Federal University of Lokoja, Nigeria;6. Department of Physics and Astronomy, University of Nigeria, Nsukka, 410001, Enugu State, Nigeria;7. National Centre for Physics, Quaid-i-Azam University Campus, Islamabad, 44000, Pakistan;1. Aryabhatta Centre for Nanoscience & Nanotechnology, Aryabhatta Knowledge University, Patna, 800001, India;2. Dept. of Zoology, A N College, Patna and Dept. of Education, Govt. of Bihar, India;1. Department of Petrochemical Technology, University College of Engineering, BIT Campus, Anna University, Tiruchirappalli, 620024, India;2. Department of Electronics and Communication Engineering, K.Ramakrishnan College of Technology, Tiruchirappalli, 621112, India;3. Department of Physics and Nanotechnology, SRM Institute of Science and Technology, Kattankulathur, 603203, India;1. GIET University, Gunupur, Odisha, India;2. International PranaGraf Mintech Research Centre (IGMRC), Odisha, India;3. Centurion University of Technology and Management, Odisha, India;1. Misr Higher Institute for Engineering and Technology, Mansoura, Egypt;2. Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt |
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| Abstract: | The emerging upconversion nanoparticles (UCNP) have gained substantial consideration in the field of bioanalytical as well as diagnostic applications. Therefore, great progress has been made in the synthesis and surface modification of luminescent UCNPs over the last two decades. In this paper, we have reported monodispersed and high luminescent upconversion nanoparticles NaYF4: 20%Yb3+, 2%Tm3+ have been synthesized using a solvothermal method, followed by a coating of the NaYF4 shell with a thin layer of SiO2 on the surface to afford the core-shell NaYF4:Yb3+, Tm3+@SiO2 nanoparticles (NP@SiO2). The prepared nanoparticles were of strong upconversion fluorescent emission intensity, hexagonal phase, and with an average size of about 8 ± 1 nm, which have been characterized by luminescence spectroscopy, powder X-ray diffraction (P-XRD), Dynamic light scattering (DLS), and Transmission electron microscopy (TEM). The results indicate that the NP@SiO2 can be used for the conjugation of fluorescent probes for various biomolecules and can find applications in cancer cell imaging and disease diagnosis. |
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| Keywords: | Upconversion nanoparticles Photoluminescence Solvothermal method and Silica-coated nanoparticles |
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