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Type: Artigo de periódico
Title: Improved Route for the Synthesis of Colloidal NaYF4 Nanocrystals and Electron Spin Resonance of Gd3+ Local Probe
Author: Iwamoto, W
Vargas, JM
Holanda, LM
Alves, E
Moreno, MS
Oseroff, SB
Pagliuso, PG
Rettori, C
Abstract: This paper presents the synthesis and characterization of colloidal NaYF4 and NaYF4:20% Gd lanthanide nanocrystals. The nanoparticles were prepared by chemical route using co-thermolysis of Na(CF3COO), Y(CF3COO)(3) and Gd(CF3COO)(3) precursor in oleylamine surfactant/phenylether at T-s 250 degrees C. By tuning the precursor/surfactant molar ratio during the process, it was possible to control the crystalline phase, chemical order and size of the nanocrystals. The nanocrystals were characterized by Transmission Electron Microscopy, Small Angle X-ray Scattering, powder X-ray Diffraction, dc-magnetization and Electron Spin Resonance (ESR) techniques. The ESR experiments show the so called U-spectrum for the Gd3+ ions in bulk counterpart materials, where characteristic powder spectra of cubic and lower crystal field symmetries were observed.
Subject: Doped LaF3 Nanoparticles
Colloidal Nanocrystals
Size Controlled Synthesis
Crystal Structure
Single-Source Precursor
Fluoride Nanocrystals
Electron Spin Resonance
Luminescent Properties
Country: EUA
Editor: Amer Scientific Publishers
Citation: Journal Of Nanoscience And Nanotechnology. Amer Scientific Publishers, v. 10, n. 9, n. 5708, n. 5714, 2010.
Rights: fechado
Identifier DOI: 10.1166/jnn.2010.2438
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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