Synthesis, morphology, optical and photocatalytic performance of nanostructured β-Ga2O3

Zinc gallate and its starting materials in solid state reaction route- A comparative study

“…From the figure we can see that the band from 1000 to 3500 cm À1 of all the samples are approximately identical. The peaks around 2925 cm À1 and 2847 cm À1 can be attributed to the stretching vibration of H-O-H group [23]. The band at 2350 cm À1 corresponds to antisymmetric stretching vibrations of CO 2 which might have been caused by the CO 2 in the ambient air [24].…”

“…The band at 2350 cm À1 corresponds to antisymmetric stretching vibrations of CO 2 which might have been caused by the CO 2 in the ambient air [24]. The peak at 1600 cm À1 represents the bending vibrations of O-H group [23]. In the low frequency range the metal oxides shows their characteristics vibrations and the graphs are different.…”

“…For the ZnO sample the peak around 530 cm À1 represents the Zn-O stretching vibration [25]. In the case of Ga 2 O 3 the strong peak around 675 cm À1 represents the Ga-O-Ga bending vibration and the peak at 459 cm À1 can be assigned to Ga-O bending vibration [23]. For the zinc gallate sample, there are two major bands at 586 and 463 cm À1 , and they are attributed to the Zn-O and Ga-O stretching vibrations in the Zinc Gallate lattice [24].…”

Efficient photocatalytic oxidation of methane over β-Ga2O3/activated carbon composites

“…The peak at around 370 nm and 400 nm could be assigned to the recombination of self-trapped excitons, which mainly originated from the band edge emission. 41,42 Furthermore, based on the previous reports, b-Ga 2 O 3 contains two kinds of Ga 3+ ions. 41,42 One is Ga 3+ ion in the tetrahedral site coordinated by four oxygen atoms and the other is that in the octahedral site coordinated by six oxygen atoms.…”

A novel organic pollutants gas sensing material p-type CuAlO 2 microsphere constituted of nanoparticles for environmental remediation

“…All the diffraction peaks are indexed to the single phase of CuAlO 2 with rhombohedral crystal system (a = b = 2.8584Å, c = 16.9580Å, ˛ = ˇ = 90 • , = 120 • ) of delafossite structure with R − 3 m space group [29]. No other characteristic peaks arising from any crystal phases were detected in the XRD pattern, indicating that the CuAlO 2 samples of high purity could be obtained under 1100 • C calcination temperature maintained for 5 h. No change in the structure was detected by further increasing the calcination time to 6 h. The average crystallite size was estimated by the Debye-Scherrer formula [30] and was found to be ∼75 nm. The HRTEM image of microsphere discussed in Section 3.1 shows clear lattice fringes along the growth direction (Fig.…”