Influence of salt solution concentration on structural properties of ZnO nanorods grown by hydrothermal method

Al-Rasheedi, Asmaa; Alonizan, N.; Ansari, Akhlur Rahman; Abdel‐Daiem, A. M.; Aida, M.S.

doi:10.1007/s00339-022-05937-8

Cited by 12 publications

(5 citation statements)

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“…For ZnO seed layer preparation by spray pyrolysis, the starting solution is composed of 0.1 molarity of zinc chloride salt dissolved in distilled water. The prepared solution is sprayed on heated glass substrates at 400 °C during 50 s. In the case of sputtering seed layer ZnO deposition, films were prepared at room temperature following similar conditions than our previous work [38], by an RF magnetron sputtering system (DC/RF Magnetron Sputter System, Syskey Technologies, Taiwan) of a ZnO target at an operating pressure of 5 × 10 −3 Torr, RF power of 200 W, and 300 sec deposition time.…”

Section: Preparation Of the Zno Seed Layersmentioning

confidence: 99%

Growth of self-aligned ZnO nanorods by hydrothermal process

Al-Rasheedi,

Khammar,

Abdel-Daiem

et al. 2023

Phys. Scr.

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The present paper discuss the growth mechanisms of ZnO nanorods thin-films using the hydrothermal process. This was achieved on a ZnO seed layer prepared by sputtering and spray pyrolysis. ZnO nanorods were prepared using various precursors, including zinc nitrate [Zn(NO3)2.6H2O], zinc chloride [ZnCl2], and zinc acetate [Zn(CH3COO)2.2H2O, to investigate the effect of salt source. The morphological and structural properties of ZnO NRs were investigated using x-ray diffraction (XRD) and a scanning electron microscopy (SEM). The deposited film consist of highly oriented crystalline ZnO NRs along the [002] axis. We found that the seed layer preparation method alters the nanorods alignment. SEM observation revealed that, regardless of the seed layer preparation method, the nature of salt source play a key role in the nanorods size. We concluded that the ZnO nanorods diameter increases in the following order with respect to zinc salt source: ZnAc <zinc nitride <zinc chloride. The mechanism of of ZnO nanorods formation is correlated with bath solution viscosity and surface tension properties. We emphasized that, in a solution with a larger viscosity and surface tension, such as zinc chloride, the motion and transfer towards the substrate, of species participating in ZnO formation, is hindered by the friction force due to the viscosity. When using a solution with lower viscosity and surface tension, such as zinc acetate, the species forming the ZnO nanorods can easily reach the substrate, which leads to a larger nucleation center, yielding low-diameter ZnO nanorods.

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Section: Preparation Of the Zno Seed Layersmentioning

confidence: 99%

Growth of self-aligned ZnO nanorods by hydrothermal process

Al-Rasheedi,

Khammar,

Abdel-Daiem

et al. 2023

Phys. Scr.

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“…However, due to their distinctive properties, such as a lack of grain boundaries, surface defects, and dislocations [6], one-dimensional ZnO nanostructures such as nanowires, nanorods, and nanotubes have attracted the majority of research studies. Thermal evaporation [7], chemical vapour deposition (CVD) [8], physical vapour deposition [9], hydrothermal [10], sol-gel [11], and electrochemical deposition [12] are the most popular synthesis processes used for ZnO nanostructures growth. Hydrothermal has been recognized as the most effective technique due to its low temperature requirement , low cost, high yield [13], and ease of growth parameters control to produce ZnO nanostructures of specific shapes and sizes in comparison to other methods [14].…”

Section: Introductionmentioning

confidence: 99%

Growth of variable aspect ratio ZnO nanorods by hydrothermal technique

Al-Rasheedi,

Salwati,

Aida

2024

Phys. Scr.

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Zinc oxide (ZnO) nanorods were successfully prepared by hydrothermal process. The influence of the solution temperature on the ZnO nanorods aspect ratio is investigated in the present work. The X-ray diffraction (XRD) and scanning electron microscopy (SEM) results and analysis reveal the formation of ZnO nanorods owing hexagonal Wurtzite structure with preferential orientation along the c-axis. We found that the solution temperature is a key parameter controlling the aspect ratio of the formed ZnO nanorods. The later increases linearly with the preparation temperature. The rod length is thermally activated with an activation energy of 0.48 eV, which corresponds to the activation energy of the reaction forming ZnO, indicating that the nanorods growth is controlled by the surface reaction rather than by mass transport. While, the rods diameter is reduced with increasing temperature, its activation energy of 0.23eV is equal to the species diffusion activation energy in the solution and to the crystallite size activation energy suggesting, thereafter that the rod diameter variation is controlled by the nucleation dynamic.

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“…[12] In contrast, because of its polar structure, 2D ZnO nanostructure growth is significantly more challenging than that of 1D nanostructure ZnO nanorods. Numerous processes, including metal organic chemical vapor deposition, [13] electrochemical, [14] sputtering, [15][16][17] and pulse laser deposition methods, [18] have been used to synthetize ZnO nanostructures. However, those techniques necessitate extreme conditions, such as vacuum vessel, high temperature, harmful gases, and complicated procedures.…”

Section: Introductionmentioning

confidence: 99%