Journal
VIBRATIONAL SPECTROSCOPY
Volume 87, Issue -, Pages 143-148Publisher
ELSEVIER
DOI: 10.1016/j.vibspec.2016.10.001
Keywords
Germanate; Rare earths; Nanoparticles; Thermal lens; Thermal diffusivity; Raman scattering
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This paper reports on the thermal and optical properties of germanate glasses GeO2-PbO co-doped with silver nanoparticles and rare earth ions (Tm3+, Er1+ and Yb3+) with a focus on the thermal diffusivity (D). The presence of rare earth ions and nanoparticles is evidenced by absorption spectra and TEM images, respectively. Additionally, a structural comparison between thin films and bulk glass with the same nominal composition is given. It is found that D increases up to 20% in samples where nanoparticles are present, although their quantity corresponds only to a volume fraction of 1.7%. Therefore, such enhancement could be associated with the nanoparticles. Nevertheless, a Raman analysis revealed a structural change after the thermal treatment used for the nucleation of the nanoparticles. A decrease in the intensity of the band at 534 cm(-1) in the Raman spectra is interpreted as the disruption of the 3-membered rings of the GeO4 tetrahedra. The Raman analysis also revealed the formation of small crystals of alpha-GeO2 type quartz and the adsorption of carbon dioxide on the surface of the silver nanoparticles inserted in the germanate thin film. (C) 2016 Elsevier B.V. All rights reserved.
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