Synthesis and Characterization of Dumbbelled Zinc Oxide
Liquid Lip Rouge,Glossy Lip Rouge,Lip Stick Batom Rouge,Lip Gloss Rouge Guangzhou Shishi Daily Chemical Co.,Ltd. , https://www.cosmeticok.com
As an important wide bandgap semiconductor material, zinc oxide has many unique properties and is therefore used in many fields such as coatings, cosmetics, catalytic gas sensors, photovoltaic devices, flat panel displays, and solar cells. In the past 20 years, people have taken various strategies to synthesize zinc oxide crystals. Among them, the wet chemical method has been widely adopted because of its low growth temperature, low preparation cost, and easy production process amplification. Its synthesis methods include controlled precipitation method, hydrothermal method, solvothermal method, sol-gel method, thermal decomposition of precursors, and sonochemical synthesis. The properties of nanomaterials are determined by their structure, namely the size, crystallinity, and geometry of the material. Using new synthetic methods may produce nanomaterials with special properties. Nevertheless, the preparation of zinc oxide crystallites with unique properties is still a great challenge for chemists and materials scientists. Author: PROCEEDINGS OF M, 35 years old, PhD; research direction: nanomaterials. Rationale, the pH of the solution, ethylenediamine plays a key role in the appearance of zinc oxide. At the same time, this paper also discusses the formation mechanism of dumbbell-shaped zinc oxide and tests its optical properties. 1. When ethylenediamine is used as a modifier, a large amount of Zn(OH)2 and a small amount of growth motif (2-) are first generated under weak alkaline conditions. In the course of the reaction, ethylene diamine will connect to the (0001) plane as the potassium surface to connect two zinc oxide growth elements. Compared with other crystal faces of zinc oxide, the (0001) surface has the fastest growth rate. The rapid growth of the crystal plane makes the middle of the zinc oxide crystallites go inward, while the two ends have a slower growth rate due to (0001), thus maintaining the plane. Appearance. As a result, dumbbell-shaped zinc oxide crystallites with smooth ends and depressions in the middle were formed. The growth mechanism of the dumb-shaped zinc oxide is shown in Fig. 2.4. The optical properties of the dumbbell-shaped zinc oxide The optical properties of zinc were tested and compared. As a result, the zinc oxide is a wide-bandgap semiconductor (Eg = 3.37 eV), as shown by the excited junction. (b) is the UV-Vis absorption photon energy of a dart-shaped zinc oxide 60 meV. This is for dumbbell-shaped zinc oxide and a dart-shaped oxygen profile. It can be seen from the figure that the head-shaped zinc oxide of the javelin has an absorption peak at 372 nm, and the calculated band gap is 3.33 eV. (a) is the UV-Vis absorption spectrum of dumbbell-shaped zinc oxide, at the line of 372 nm. There is also a similar absorption peak, and there is an absorption peak reported at 373 nm of the bulk material, ie, no quantum size effect, but the comparison of the two lines shows that the dumbbell zinc oxide has a broad absorption band in the infrared and visible regions. A similar situation was reported. It is believed that the visible absorption intensity of UV-rays is related to the photocatalytic performance of optical catalysts. Zinc oxide with such optical properties has wide application prospects in the field of medical military, biology, and optoelectronics. (a) and (b) are room-temperature fluorescence spectra of dumbbell-shaped and dart-headed zinc oxide, respectively. (a) There are two emission bands: one is the ultraviolet emission band near 394 nm, which is near-band edge emission, which is caused by the free exciton emission; the other is the green emission band near 548 nm, which is mainly the source. Defects in deep levels related to oxygen vacancies in zinc oxide crystals. However, () has ultraviolet emission bands and green emission bands centered on 399 nm and 542 nm. It is reported that the UV emission band of zinc oxide is generally in the range of 370 to 390 nm, and the emission band of green light is in the range of 510 to 550 nm. It can be seen that the peak positions of the dumbbell-shaped zinc oxide and the head-type zinc oxide are slightly red shifted. Comparing the two spectral lines, it was found that the peak intensity of the ultraviolet emission band of the dumbbell-shaped zinc oxide was far greater than that of the zinc oxide of the standard javelin-shaped head. The peak intensity of the green light emission band of the dumbbell zinc oxide is significantly smaller than that of the javelin-shaped zinc oxide, and it is generally considered that the green emission band is caused by oxygen defects in the zinc oxide sample. Fluorescence Spectra of Zinc Oxide 3 Conclusion Ultrasound-assisted reflow method was used to prepare uniform dumbbell-shaped zinc oxide, and the influence of reaction conditions on the formation of dumbbell-shaped zinc oxide was investigated. The results showed that the ultrasonic treatment, the pH of the solution, and ethylenediamine played an important role in the dumbbell-like morphology of zinc oxide. The weak alkaline solution was conducive to the formation of high-quality dumbbell-shaped zinc oxide crystallites. The growth mechanism theory was used to investigate the formation mechanism of dumbbell-shaped zinc oxide. UV-Vis absorption spectra and fluorescence spectra tests show that the dumbbell-like zinc oxide has unique optical properties.