Influence of thermal annealing and ion irradiation on zinc silicate phases in nanocomposite ZnO–SiOx thin films

Tailoring Structural, Chemical, and Photocatalytic Properties of ZnO@β-SiC Composites: The Effect of Annealing Temperature and Environment

“…The components required for the fitting process are encircled by red dashed curves, and the extracted parameters like volume fraction, strain, and cell parameters are summarized in Table 1. As expected, only the reflections from ZnO and β-SiC are obtained in ZS-7A, whereas α-Zn 2 SiO 4 with an R3̅ H space group symmetry is unveiled in ZS-9A, ZS-11A, and ZS-12A, in good agreement with the results of Valiveti et al 36 Moreover, Rivera−Enriquez et al, 37 however, reported the formation of amorphous β-zinc silicate in coprecipitated samples at 650 °C, but it was found to be transformed to the α-phase at 900 °C. On the other side, Wahab et al 38 demonstrated a transformation of β zinc silicate to the α-phase when annealed the mixture of ZnO and WRHA (96% SiO 2 ) at ∼950 °C.…”

“…According to the existing literature, the composites of ZnO and SiC often form a porous and less ordered structure at low annealing temperatures, where amorphous SiC may also be present in this stage. However, the crystallinity and grain size of both ZnO and β-SiC have been shown to be increased with the increase in annealing temperature, and in turn, it improves their chemical and structural stability and the subsequent enhancement of photocatalytic activity. − On the contrary, the crystal structure of ZnO has also been shown to aggregate and form bigger clusters in the β-SiC matrix at high temperatures, and as a result, this negatively affects the photocatalytic activity due to the lower surface-to-volume ratio. , However, none of these models can be used to explain the present findings due to the presence of the Zn 2 SiO 4 phase at the ZnO/β-SiC interface during thermal annealing. Under these circumstances, the present intriguing MB dye degradation phenomenon (Figure ) can be explained in light of the gradual development of the Zn 2 SiO 4 phase at the ZnO/β-SiC interface and its subsequent effect on the charge separation and its transport capability, as shown in Figure .…”

“… 75 − 78 On the contrary, the crystal structure of ZnO has also been shown to aggregate and form bigger clusters in the β-SiC matrix at high temperatures, and as a result, this negatively affects the photocatalytic activity due to the lower surface-to-volume ratio. 36 , 74 However, none of these models can be used to explain the present findings due to the presence of the Zn 2 SiO 4 phase at the ZnO/β-SiC interface during thermal annealing. Under these circumstances, the present intriguing MB dye degradation phenomenon ( Figure 11 ) can be explained in light of the gradual development of the Zn 2 SiO 4 phase at the ZnO/β-SiC interface and its subsequent effect on the charge separation and its transport capability, as shown in Figure 12 .…”

The effect of silica sols on electrodeposited zinc coatings for sintered NdFeB

“…7(a)). [44][45][46][47] The adsorbed silica nanoparticles at the grain boundaries may change the growth orientation of the zinc grains. When the silica sol content continued to increase from 15% to 25% (Fig.…”

Preparation of ZnO‐glass composite hollow fiber and its application in formation of ZIF‐8 membrane

“…It is worth noting that new characteristic peaks appear in addition to the original ZnO signals for ZnO-glass composite HFs after sintering at 1150 • C. XRF data showed that the main component of glass powder was SiO 2 . The new characteristic peaks correspond to ZnSi 2 O 4 , 37,38 resulting from the interaction between SiO 2 in the glass and ZnO in the HF during the high temperature sintering process. It is precisely because of these characteristics and changes that the addition of glass powder can adjust the structure, mechanical strength, and other properties of HFs.…”