Characterization of sol–gel glasses with different copper concentrations treated under oxidizing and reducing conditions

Structure and optical properties of Cu O- and Cu Se-doped sol–gel silica glasses

“…We show here only some selected representative spectra of the copper nanoparticles (Fig. 4): they are variable changing properties of xerogels and dopant concentration retaining similar principal appearance [7,8].…”

Effect of Zn Addition on Non-Resonant Third-Order Optical Nonlinearity of the Cu-Doped Germano-Silicate Optical Glass Fiber

“…37 Thus, the observed broad optical absorption band centered at about 1,100 nm in the Cu-doped germano-silicate optical glass fiber can be attributed to the three electronic transitions in d orbitals corresponding to 2 E g -2 B 1g , 2 A 1g -2 B 1g and 2 B 2g -2 B 1g . [37][38][39] The absorption peak at 469 nm in the Cu/Zn-codoped germano-silicate optical glass fiber was due to the strong confinement effect of ZnO semiconductor particles and the peak position was shifted relative to the exciton absorption in the ZnO-doped germano-silicate optical glass fiber reported earlier (490 nm), 40 the ZnO nanorod (381 nm), 41 or the thin-film of carbon encapsulated Zn-ZnO nanoparticles (344 nm). 42 Earlier, the shift of optical absorption peak was also observed from the nano-particles embedded in the silica matrix due to quantum size effect.…”

Copper reduction and hydroxyl formation by hydrogen process in alumino-silicate glasses

“…Since the heat treatment was carried out in a planar sample inside a hydrogen-containing atmosphere, the hydrogen diffusion can be classified as one-dimensional diffusion from the surface. If this hypothesis is correct, the increase in the FT-IR absorption should be linear with the diffusion length and consequently with the square root of time [30]. Fig.…”