Author, as appears in the article.: Joan J. Carvajal; Oleksandr A. Savchuk; C. Cascales; M. Aguiló; F. Díaz
Department: Química Física i Inorgànica
URV's Author/s: CARVAJAL MARTÍ, JOAN JOSEP; Oleksandr A. Savchuk; C. Cascales; AGUILÓ DÍAZ, MAGDALENA; DÍAZ GONZÁLEZ, FRANCISCO MANUEL
Keywords: core-shell luminescence Nanosensors
Abstract: We studied the temperature-dependent luminescence of GdVO4 nanoparticles co-doped with Er3+ (1 mol %) and Yb3+ (20 mol %) and determined their thermal sensing properties through the fluorescence intensity ratio (FIR) technique. We also analyzed how a silica coating, in a core-shell structure, affects the temperature sensing properties of this material. Spectra were recorded in the range of biological temperatures (298-343 K). The absolute sensitivity for temperature determination calculated for the core-shell nanoparticles is double the one calculated for bare nanoparticles, achieving a thermal resolution of 0.4 K. Moreover, silica-coated nanoparticles show good dispersibility in different solvents, such as water, DMSO, and methanol. Also, they show good luminescence stability without interactions with solvent molecules. Furthermore, we also observed that the silica coating shell prevents progressive heating of the nanoparticles during prolonged excitation periods with the 980 nm laser, preventing effects on their thermometric applications.
Research group: Física i Cristal.lografia de Materials Física i Cristal·lografia de Nanomaterials
Thematic Areas: Química Química Chemistry
licence for use: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 1944-8244
Author identifier: 0000-0002-4389-7298; n/a; n/a; 0000-0001-6130-9579; 0000-0003-4581-4967
Record's date: 2016-05-02
Last page: 7273
Journal volume: 8
Papper version: info:eu-repo/semantics/acceptedVersion
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Entity: Universitat Rovira i Virgili
Journal publication year: 2016
First page: 7266
Publication Type: Article Artículo Article
Repositori URV