AFM and XPS study of nitrided TiO2 and SiO2–TiO2 sol–gel derived films

Electrical conductivity of NbN–SiO2 films obtained by ammonolysis of Nb2O5–SiO2 sol–gel derived coatings

“…No peaks arising from SiO 2 and silica nitrides or oxynitrides are observed what may suggest that silica matrix is amorphous. As it was reported before, SiO 2 remains amorphous even after nitridation at 1200°C [6].…”

Structural investigations of nitrided Nb2O5 and Nb2O5–SiO2 sol–gel derived films

“…After nitridation, all films except for the pure SiO 2 appear to be crystalline with regularly shaped nanocrystals. The SiO 2 film remained amorphous, in accordance with the data presented by Wicikowski et al [16]. Therefore, the molar ratio of Nb 2 O 5 :SiO 2 allows to control the amount of crystalline NbN in the amorphous matrix.…”

Photocatalytic degradation of trichloroethylene using N-doped TiO2 prepared by a simple sol–gel process

“…The slow drying and heating at a relatively low temperature led to moderate particle growth and small particles. Figure 4 shows the XPS spectra relating to the binding energy of the N 1s electron at around 400 eV for the non-doped and the N-doped TiO 2 s [11,31]. A weak peak in the spectrum of the non-doped TiO 2 was observed at approximately 402 eV, assigned to the nitrogen molecules adsorbed on the TiO 2 .…”

“…N-doping has also been widely investigated because its availability [3][4][5][6][7][8][9][10][11][12][13]. Ndoped TiO 2 photocatalysts are usually prepared by treating TiO 2 with NH 3 , for example, heating TiO 2 in an NH 3 gas atmosphere [5,7,10,13].…”