Size effects on electrical properties of chemically grown zinc oxide nanoparticles

Rathod, K.N.; Joshi, Zalak; Dhruv, Davit; Gadani, Keval; Boricha, Hetal; Joshi, A.D.; Solanki, P.S.; Shah, N.A.

doi:10.1088/2053-1591/aab5ec

Cited by 30 publications

(5 citation statements)

References 52 publications

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“…Depending on the synthesis temperature, the size of the zinc oxide crystallites was in the range of 16.80–56.15 nm ( Table 1 ). The effect of the calcination temperature (450–750 °C) on the linear growth of crystallites (38–50 nm) was also previously reported [ 32 ]. A similar trend occurred in hydrothermal synthesis at temperatures of 125–200 °C using microwaves, which led to a smaller size of the crystallites from 4 nm to 37 nm [ 33 ].…”

Section: Resultssupporting

confidence: 63%

Hydrothermal Synthesis of ZnO Superstructures with Controlled Morphology via Temperature and pH Optimization

Ejsmont

Gościańska

2023

Materials

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Zinc oxide, as a widely used material in optics, electronics, and medicine, requires a complete overview of different conditions for facile and easily reproducible syntheses. Two types of optimization of ZnO hydrothermal preparation from zinc acetate and sodium hydroxide solution are presented, which allowed for obtaining miscellaneous morphologies of materials. The first was a temperature-controlled synthesis from 100 to 200 °C, using citric acid as a capping agent. The formation of hexagonal rods at the lowest temperature was evidenced, which agglomerated to flower-like structures at 110 and 120 °C. It was followed by transformation to flake-like roses at 160 °C, up to disordered structures composed of nanosized plates (>180 °C). The transformations were generated through a temperature change, which had an impact on the diffusion effect of hydroxide and citrate complexes. The second optimization was the hydrothermal synthesis free of organic additives and it included only a pH variation from 7.5 to 13.5. It was found that by utilizing a slow-dropping process and varying amounts of NaOH solutions, it is possible to obtain well-formed hexagonal pellets at pH 8.0–8.5. Strongly basic conditions of pH 11.0 and 13.5 impeded superstructure formations, giving small elongated particles of ZnO. All samples were characterized by high phase purity and crystallinity, with a specific surface area of 18–37 m2/g, whereas particle size distribution indicated a predominance of small particles (<1 μm).

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Section: Resultssupporting

confidence: 63%

Hydrothermal Synthesis of ZnO Superstructures with Controlled Morphology via Temperature and pH Optimization

Ejsmont

Gościańska

2023

Materials

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“…There are various studies that investigate the calcination temperature–time interval of ZnO coating on different substrates. The authors mostly agreed that ZnO formation was completed at 600°C over 15 min of sintering process 55–58 . Therefore, to produce the ZnO particles on the samples in this work, coated ceramics were sintered at 600°C for 60 min.…”

Section: Methodsmentioning

confidence: 90%

“…The authors mostly agreed that ZnO formation was completed at 600 • C over 15 min of sintering process. [55][56][57][58] Therefore, to produce the ZnO particles on the samples in this work, coated ceramics were sintered at 600 • C for 60 min.…”

Section: Zno Coating On Porous Ceramicsmentioning

confidence: 99%

Photocatalytic properties of ZnO nanoparticle coating on porous ceramic substrates with varying porosities produced from fly ash and red mud

Özcan,

Birol,

Dülger Kutlu

et al. 2023

Int J Applied Ceramic Tech

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In order to improve filtering efficacy, nanoparticles are often deposited as photocatalytic degrading agents onto porous ceramics. This study aimed to deposit ZnO nanoparticles on ceramic substrates produced from fly ash and red mud with adjustable porosity and investigate their photocatalytic properties. To achieve this goal, at first porous ceramics were produced and sintered at various temperature/time intervals. It was observed that sintering at 800°C for 120 min provided a proper structure and porosity. In addition, MgO replacement with MgCO3 lowered the water absorption of the samples from 25.63% to 11.45%. The samples were then coated with ZnO nanoparticles using the sol–gel method and the ZnO structures obtained were micron‐sized plates. It was observed that increasing porosity increased the ZnO amount and accordingly the photocatalytic properties of the products. During the adsorption tests conducted in the dark, the coated ceramic samples were stained with MB with a maximum MB adsorption ratio of ∼14%. On the other hand, no visible MB stain was observed on the samples that were exposed to UV irradiation, and the MB removal after the UV irradiation was 93.6%; therefore, it was concluded that the dominant MB removal mechanism was photocatalytic.

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“…At higher frequencies, trapped charge density gets reduced and hence mobility of charge carriers gets enhanced, which permits more current to flow which in turn decreases the impedance. 47 During the impedance dimension electrons get enough power by way of an electric field and ensuing the current to flow. It is most probable that those free electrons in all the samples are due to oxygen deficiency within the ZnO nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of ZnO:NiO Nanocomposites Prepared by Phyllanthus Emblica Fruit Extract Assisted Green Method

Vala,

Pashvan,

Solanki

et al. 2023

ECS J. Solid State Sci. Technol.

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We present the environment-friendly facile production of ZnO nanoparticles and ZnO: NiO nanocomposites by a completely green synthesis method using Phyllanthus emblica fruit extract as solvent as well as reducing agent. The existence of ZnO and NiO phases in the nanocomposites is confirmed by XRD analysis. Rietveld Refinement was performed to calculate the corresponding structural parameters. The average crystallite size is found in between 18 nm to 22 nm for the different phases present in all the samples. The microstructures of ZnO nanoparticles and ZnO:NiO nanocomposites were investigated by FE-SEM, displaying mixed morphology having a combination of quasi-spherical and hexagonal shape and the particle size varying from 20 nm to 120 nm. The existence of vibrational modes corresponding to ZnO and NiO phases is shown by Raman spectroscopy. Dielectric characteristics were examined as a function of applied electric field frequency, revealing a decrease in dielectric constant with NiO addition, which was ascribed to the creation of ZnO:NiO interfaces in the composites. Complex impedance analysis was used to confirm the effect of grain and grain boundary resistance on dielectric characteristics. Complex impedance analysis, which supports the predominance of grain boundaries in the conduction process, was used to confirm the effect of grain and grain boundary resistance on the dielectric characteristics.

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Size effects on electrical properties of chemically grown zinc oxide nanoparticles

Cited by 30 publications

References 52 publications

Hydrothermal Synthesis of ZnO Superstructures with Controlled Morphology via Temperature and pH Optimization

Hydrothermal Synthesis of ZnO Superstructures with Controlled Morphology via Temperature and pH Optimization

Photocatalytic properties of ZnO nanoparticle coating on porous ceramic substrates with varying porosities produced from fly ash and red mud

Synthesis and Characterization of ZnO:NiO Nanocomposites Prepared by Phyllanthus Emblica Fruit Extract Assisted Green Method

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