Influence of Reaction Time, Reducing Agent and Zinc Precursors on the morphological Structures of Zinc Oxide (original) (raw)
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Materials Chemistry and Physics, 2019
Three precursor concentrations were used for synthesizing zinc oxide nanoparticules by sol-gel via spin-coating method. The final products were synthesized at calcination temperatures of 550 °C during 2 hours. X-ray diffraction (XRD) analysis showed that ZnO thin films were preferentially oriented along the (002) c-axis direction perpendicular to the substrate surface and had crystalline structure with a hexagonal wurtzite phase. EDX microanalysis and morphological investigations using SEM indicated respectively that the products consist of zinc (Zn) and oxygen (O) elements and the stoichiometric atomic ratio of Zn:O ≅ 1:1, and surface of nanoparticles is homogeneous. Comparing the XRD report of three samples, it has been concluded that samples prepared at 0.75M condition give high intensity of fine peaks and better improved properties with potential applications as transparent electrodes in optoelectronic devices such as solar cells. Therefore, this deposition condition can be used for further deposition condition for reproductivity in other research laboratories.
Zinc Oxide Synthesis from Extreme Ratios of Zinc Acetate and Zinc Nitrate: Synergistic Morphology
Materials, 2022
The synthesis of ZnO comprising different ratios of zinc acetate (ZA) and zinc nitrate (ZN) from the respective zinc precursor solutions was successfully completed via a simple precipitation method. Zinc oxide powders with different mole ratios of ZA/ZN were produced—80/1, 40/1, and 20/1. The crystallinity, microstructure, and optical properties of all produced ZnO powders were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis-NIR spectrophotometry. The average agglomerated particle sizes of ZnO-80/1, ZnO-40/1, and ZnO-20/1 were measured at 655, 640, and 620 nm, respectively, using dynamic light scattering (DLS). The optical properties of ZnO were significantly affected by the extreme ratio differences in the zinc precursors. ZnO-80/1 was found to have a unique coral-sheet structure morphology, which resulted in its superior ability to reflect near-infrared (NIR) radiation compared to ZnO-40/1 and ZnO-20/1. The NIR-shielding performances of ...
Zinc Oxide—From Synthesis to Application: A Review
Materials, 2014
Zinc oxide can be called a multifunctional material thanks to its unique physical and chemical properties. The first part of this paper presents the most important methods of preparation of ZnO divided into metallurgical and chemical methods. The mechanochemical process, controlled precipitation, sol-gel method, solvothermal and hydrothermal method, method using emulsion and microemulsion enviroment and other methods of obtaining zinc oxide were classified as chemical methods. In the next part of this review, the modification methods of ZnO were characterized. The modification with organic (carboxylic acid, silanes) and inroganic (metal oxides) compounds, and polymer matrices were mainly described. Finally, we present possible applications in various branches of industry: rubber, pharmaceutical, cosmetics, textile, electronic and electrotechnology, photocatalysis were introduced. This review provides useful information for specialist dealings with zinc oxide.
Hitite journal of science and engineering, 2016
Z inc oxide is an important technological material due to its wide band gap (3.37 eV), high electron mobility and large exciton binding energy at room temperature [1]. Because of these unique characteristic, zinc oxide (ZnO) is a very attractive materials for various applications such as conductive oxide, antistatic coating, sensors, band gap optoelectronic devices, pigments and an UV filters in sunscreens. Depending upon the different synthesis methods, it can be synthesised with various type of morphology such as rod like, sphere like, flower like or urchinlike morphologies [1-3]. The crystal structure, particle size and morphology of ZnO particles are important parameters which affect the properties of the powder and hence determine application areas. For example, ZnO particles with large surface area can be utilised for enhancing gas sensing applications [4] where the amount of absorbed oxygen is strongly depending on morphology, surface area and grain size of the sensing material [5].
On the growth and characterisation of Zinc Oxide
2010
Optical, electrical and structural properties of ZnO grown via grown via PLD and VPT were examined. Both growth techniques were successful in producing nanostructured ZnO with thin films also produced with PLD. An epitaxial relationship to the substrate was found for all materials. A temperature-stepping growth process was identified as beneficial to overall material quality. Good quality nominally un-doped material with sharp near band edge (NBE) emission was achieved, demonstrating a FWHM of 1.9meV, compared to 0.7meV for single crystal samples. VPT and PLD nano-strucutres displayed a characteristic PL features due to the surface exciton, SX. Doped ZnO demonstrated p-type conductivity, with carrier concentrations as high as 4.10*16 cm−3 under illumination for N-ZnO. P-ZnO displayed a fast-decaying photoconductive effect. High concentrations of dopant were found disadvantageous to crystalline and optical quality, but evidence of ABX emission was observed with as much as 2.5 wt% of ...