Magnetic and optical properties as well as EPR studies of polycrystalline ZnO synthesized from different precursors

Revealing the effect of synergistic interaction between ZnO and ZnCr2O4 on the syngas aromatization

“…Figure 3 showed two EPR signals at g = 1.957 and 2.003 on pure ZnO. The signal at g = 2.003 indicated the presence of oxygen vacancies (Vo), and the signal at g = 1.957 assigned to zinc interstitials (Zn i ) was ascribed to the so‐called shallow donors and related to oxygen vacancies 33–37 . It can be seen that only the oxygen vacancy signal with g = 2.003 was present on ZnCr 2 O 4 , while the Zn i signal peak belonging to ZnO disappeared on the xZZC catalysts.…”

“…The signal at g = 2.003 indicated the presence of oxygen vacancies (Vo), and the signal at g = 1.957 assigned to zinc interstitials (Zn i ) was ascribed to the so-called shallow donors and related to oxygen vacancies. [33][34][35][36][37] It can be seen that only the oxygen vacancy signal with g = 2.003 was present on ZnCr 2 O 4 , while the Zn i signal peak belonging to ZnO disappeared on the xZZC catalysts. At this time, the oxygen vacancy on xZZC catalysts gradually shifted form g = 2.003 to g = 2.005 and followed the intensity order of 0.3ZZC > 0.15ZZC > 0.09ZZC, indicated that there existed interaction between ZnO and ZnCr 2 O 4 after touching each other, resulting in an increase of oxygen vacancies on the xZZC catalysts, which was consistent with the results of E. Cerrato.…”

Modified Approach Using Mentha arvensis in the Synthesis of ZnO Nanoparticles—Textural, Structural, and Photocatalytic Properties

“…The second signal was detected at a g-value of 1.997 (S2). According to literature data, the signal with a g-factor close to the free electron 2.0023 in ZnO refers to singly ionized oxygen vacancies (V0 + ) defects [50,51]. Other researchers detected a similar peak with g = 2.003, attributed to Zn vacancy [52] or nonaxial negatively charged Zn vacancy complexes [53].…”

“…The second signal was detected at a g-value of 1.997 (S2). According to literature data, the signal with a g-factor close to the free electron 2.0023 in ZnO refers to singly ionized oxygen vacancies (V 0 + ) defects [50,51]. The band at 2960 cm −1 corresponds to asymmetric C-H stretching, while the bands at 2924 cm −1 and 2852 cm −1 correspond to saturated sp 3 carbon [46].…”

The photocatalytic degradation of a binary textile dyes mixture within a new configuration of loop reactor using ZnO thin film-phytotoxicity control

“…The Oxygen vacancies can also induce band-gap narrowing and enhance visible light photocatalytic activity of ZnO [66]. An insignificant small amount of carbon impurities may induce the concomitant appearance of oxygen vacancies responsible for the green light emission evidenced by photoluminescence, as well as photocatalytic activities in the visible spectral range [67]. From Figure 4(a, b), two gyromagnetic factor "g " values are obtained considering the low and high fields of absorption peaks.…”