Oxygen vacancies induced room temperature ferromagnetism and gas sensing properties of Co-doped TiO2 nanoparticles

TiO2/ZIF-67 nanocomposites synthesized by the microwave-assisted solvothermal method: a correlation between the synthesis conditions and antimicrobial properties

“…An additional absorption band, characterized by a shoulder at around 650 nm, was also observed for OPCs. This additional signal may be related to the presence of Co 2+ in the TiO 2 lattice, located at octahedral sites, also noticed in other studies describing cobalt-doped titanium oxide 41,42 and in agreement with XPS data.…”

Optimized Lithography-Free Fabrication of Sub-100 nm Nb2O5 Nanotube Films as Negative Supercapacitor Electrodes: Tuned Oxygen Vacancies and Cationic Intercalation

“…These oxygen vacancies are expected to provide excess active sites to execute electrochemical redox reactions. ,, Moreover, the obtained Raman spectra for both films showed two major Raman peaks at 230 and 310 cm –1 , which correspond to the bending mode of Nb–O–Nb. Meanwhile, the sharp peak positioned at ∼704 cm –1 could be mainly ascribed to the Nb–O stretching mode . As shown in Figure S4, there is a decrease in the peak intensity for the H-NbZr film, with significantly broad and weak modes for the A-NbZr counterpart, accompanied by a shift in the band position of about 4 cm –1 toward the low frequency.…”

“…Meanwhile, the sharp peak positioned at ∼704 cm −1 could be mainly ascribed to the Nb− O stretching mode. 49 As shown in Figure S4, there is a decrease in the peak intensity for the H-NbZr film, with significantly broad and weak modes for the A-NbZr counterpart, accompanied by a shift in the band position of about 4 cm −1 toward the low frequency. This frequency shift and the peak broadening might be attributed to the existence of oxygen vacancies in the lattice of the H-NbZr film.…”

Advances in designs and mechanisms of semiconducting metal oxide nanostructures for high-precision gas sensors operated at room temperature

“…Doping of metal ions in SMONs can increase the number of active sites and defects on the surface of SMON nanocrystals, and thus enhance the amount of oxygen species and increase the adsorbed gas molecules on the sensor's surface. Therefore, the gas sensing performance of the SMONs can be effectively improved by doping of metal ions including Al 3+ , 117,271 Cu 2+ , 272,273 Zn 2+ , 274 Ni 2+ , 275,276 Co 3+ , 277,278 Fe 3+ , 279 Mg 2+ 280 and Sb 5+ . 281 The recent key sensing applications of RT gas sensors using this method are summarized in Table 4.…”