Nanoscaled optical fibre obtained by the sol–gel process in the SiO2–ZrO2 system doped with rare earth ions

Luminescence properties of ytterbium and erbium doped silica–zirconia nanostructured optical fiber under near infrared excitation

“…Both Er 3 þ and Yb 3 þ doped silica-zirconia nanostructured optical fibers present a 3 mm core diameter as measured by Scanning Electron Microscopy (SEM); these data can be correlated to the half height width of the refractive index profile (RIP) of the fiber, which shows a graded shape that was previously explained in other articles [10,11]. The refractive index difference (Dn) between the pure silica cladding and the nanocomposite core is equal to 0.043 in the case of the Er 3 þ doped fiber and 0.021 in the case of the Yb 3 þ doped fiber.…”

“…Previous studies have demonstrated the possibility of preparing optical fibers that integrate zirconia nanocrystals dispersed in an amorphous silica core by the sol-gel process and shown that such fibers present good waveguiding properties [10,11]. The low phonon energy of the zirconia nanocrystals, which are dispersed in the core, increases the probability of radiative transitions in the RE ions trapped in the nanostructured matrix.…”

Synthesis and characterization of Li4Ti5O12

“…Many binary oxides containing Ti have been prepared with the second metal component in the oxides being Na, K, Rb and Cs [27]. The raw materials used to produce these binary oxide systems may consist of organic/inorganic compounds [28,29] or a combination of inorganic compounds [30,31]. Syntheses of Li 4 Ti 5 O 12 via sol-gel technique employing oxalic acid [32], acetic acid [33] and triethanolamine (TEA) as chelating agents [25] have been reported.…”

Cellulose fibers modified by Eu3+-doped yttria-stabilized zirconia nanoparticles

“…These results correspond to the (110) and (020) plane of the crystallites in cellulose I and II respectively. The four peaks in X-diffraction pattern centered at c. 30, 35, 50, 60, 74, 82°(2h) are recognized as the characteristic peaks of tetragonal structure ZrO 2 crystals associated with (101) t plane (Chen et al 2004;Brasse et al 2009). The intensity of all of these peaks is proportional to the content of the modifier in polymer matrices.…”