Hierarchical structures of ZnO spherical particles synthesized solvothermally

Saito, Noriko; Haneda, Hajime

doi:10.1088/1468-6996/12/6/064707

Cited by 28 publications

(31 citation statements)

References 40 publications

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“…The particle size did not so much depend on the preparation conditions and was comparable to the previous results prepared in 87.5 vol %-EG solvents at 95°C. 5) Newly precipitated powders were porous, and the surface of the aged powders was covered with plate-like patches. Induction periods before precipitation of spherical particles were about 6 and 3 h at 95 and 120°C, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…One of the methods to synthesize ZnO hierarchical structures is the ethylene glycol (EG)-assisted solvothermal process using mixtures of water and EG as solvents. 5) Because EG has affinity for water, the conditions of hydrothermal processes can be optimized by adjusting the mixing ratio of EG and water. Round shaped ZnO particles such as spheres, doughnuts and flowers have been synthesized.…”

Section: )14)16)19)mentioning

confidence: 99%

“…Spherical ZnO particles with hierarchical structures built of small crystallites were obtained at lower temperatures than the cases in the absence of HMT. 5) The volume ratio of EG to water played a critical role in the formation of spherical particles. In addition, EG restricted the growth of ZnO microcrystals and particles were composed of smaller crystallites at higher ratio of EG to water in solvents.…”

Section: )14)16)19)mentioning

confidence: 99%

“…It occurred due to the capping effect, 15) which was commonly-observed in the EGassisted solvothermal synthesis of ZnO particles. 5) Nanostructures with small size, good crystallinity, and lessagglomerated configurations have advantages. In this study, we selected a high EG concentration condition, the 95 vol %-EG solvent, for ZnO spherical particles made of small crystallites, and investigated the effects of the aging period and temperature on the morphology of the ZnO powder.…”

Section: )14)16)19)mentioning

confidence: 99%

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Solvothermal synthesis of ZnO spherical particles and VOC sensor application

Saito

Matsumoto

Watanabe

et al. 2014

J. Ceram. Soc. Japan

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We synthesized micrometer-sized ZnO spherical particles solvothermally from the solutions of zinc acetate anhydride, hexamethylenetetramine (HMT), ethylene glycol (EG) and water, and examined the gas sensing properties. The spherical powders were composed of nano particles, which were radially aligned along the c-axis. We obtained particles with smaller crystallites under conditions of higher EG concentrations and shorter reaction period. Spherical powder made of crystallites of 3 5 nm was precipitated in the 95 vol %-EG solvent by heating at 120°C for 4 h. The ZnO powder annealed at 450°C worked as a gas sensor device for volatile organic compounds (VOC) gases. The sensitivity was the best in the case of ethanol gas at 350°C.

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Section: Resultsmentioning

confidence: 99%

Section: )14)16)19)mentioning

confidence: 99%

Section: )14)16)19)mentioning

confidence: 99%

Section: )14)16)19)mentioning

confidence: 99%

See 2 more Smart Citations

Solvothermal synthesis of ZnO spherical particles and VOC sensor application

Saito

Matsumoto

Watanabe

et al. 2014

J. Ceram. Soc. Japan

Self Cite

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show abstract

“…However, only a small part mentioned the synthesis of hierarchical ZnO materials in photocatalytic application [4,[8][9][10]. In addition, especially in the photocatalytic application of ZnO, most of the previous reviews are limited to low dimension (0D, 1D and 2D) ZnO nanostructures, where reviews about hierarchical ZnO nanostructures are still insufficient.…”

Section: Introductionmentioning

confidence: 99%

A Review on the Fabrication of Hierarchical ZnO Nanostructures for Photocatalysis Application

et al. 2016

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Semiconductor photocatalysis provides potential solutions for many energy and environmental-related issues. Recently, various semiconductors with hierarchical nanostructures have been fabricated to achieve efficient photocatalysts owing to their multiple advantages, such as high surface area, porous structures, as well as enhanced light harvesting. ZnO has been widely investigated and considered as the most promising alternative photocatalyst to TiO 2 . Herein, we present a review on the fabrication methods, growth mechanisms and photocatalytic applications of hierarchical ZnO nanostructures. Various synthetic strategies and growth mechanisms, including multistep sequential growth routes, template-based synthesis, template-free self-organization and precursor or self-templating strategies, are highlighted. In addition, the fabrication of multicomponent ZnO-based nanocomposites with hierarchical structures is also included. Finally, the application of hierarchical ZnO nanostructures and nanocomposites in typical photocatalytic reactions, such as pollutant degradation and H 2 evolution, is reviewed.

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Morphology‐controllable synthesis of ZnO nano‐/micro‐ structures by a solvothermal process in ethanol solution

Zhang

Sui

et al. 2013

Crystal Research and Technology

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Flower‐like ZnO nanostructures assembled by nanorods with bimodal size distribution have been synthesized by a solvothermal process in NaOH‐Et system. Various effects of the solvothermal parameters and assistant additives on the morphologies of ZnO nanostructures have been investigated. The directing effect of chloride ions have been observed in the formation of highly symmetrical 3D ZnO nanostructures. A possible mechanism has been proposed to explain the formation of ZnO nanoflowers in NaOH‐Et system. A strong near‐UV emission band centered at around 396 nm is observed in the photoluminescence spectrum of flower‐like ZnO nanostructures, indicating of their high crystal quality.

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Hierarchical structures of ZnO spherical particles synthesized solvothermally

Cited by 28 publications

References 40 publications

Solvothermal synthesis of ZnO spherical particles and VOC sensor application

Solvothermal synthesis of ZnO spherical particles and VOC sensor application

A Review on the Fabrication of Hierarchical ZnO Nanostructures for Photocatalysis Application

Morphology‐controllable synthesis of ZnO nano‐/micro‐ structures by a solvothermal process in ethanol solution

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