Kirkendall void formation and selective directional growth of urchin-like ZnO/Zn microspheres through thermal oxidation in air

Hsu, Chih-Yu; Chang, Kai-Hsiang; Gong, Jyun-An; Tirén, J; Li, Yuan-Yao; Sakoda, Akiyoshi

doi:10.1039/c5ra19168h

Cited by 3 publications

(3 citation statements)

References 82 publications

(76 reference statements)

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“…However, many problems are encountered during the preparation and application of these methods such as particle aggregation, incomplete reaction, high cost, and complex processing . Direct oxidation of metallic zinc is a simple, cost‐effective, catalyst‐free, and one‐step process for the formation of different ZnO nanostructures . However, the direct oxidation reactions of Zn usually take place at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal oxidation synthesis of rod‐like ZnO and the influence of oxygen vacancy on photocatalysis

Wang

et al. 2017

J Chinese Chemical Soc

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Rod‐like ZnO nanoparticles (NPs) were synthesized from zinc powder by a simple hydrothermal oxidation method. The presence of acetylacetone could promote the oxidation reaction of Zn and the formation of hexagonal nanorods. Then, the as‐prepared samples were annealed in N2 , O2 , and air atmosphere at 550°C for 2 h to control the number of oxygen vacancies in the samples. The samples were characterized by X‐ray diffraction, scanning electron microscopy, X‐ray photoelectron spectroscopy, and UV–vis spectroscopy. The correlation between the oxygen vacancies and the photocatalytic activity was investigated. The results reveal that the annealing process alters the samples’ bandgap and number of the oxygen vacancies, thereby improving the photocatalytic activity. The enhancement of photodegradation efficiency arising from the appropriate content of oxygen vacancies is discussed.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal oxidation synthesis of rod‐like ZnO and the influence of oxygen vacancy on photocatalysis

Wang

et al. 2017

J Chinese Chemical Soc

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“…One potential reason for this is that Zn diffuses rapidly when heated, which can result in imbalanced diffusion with a consequent void formation due to the Kirkendall effect. 20 Another observation is that no change in contrast arises that delineates the ZnO interfacial layer from subsequently deposited ZnMgO (Figure 1c). This can occur because the difference in electrical conductivity may not be sufficient to generate contrast in the image.…”

mentioning

confidence: 97%

“…Both films contained a significant number of voids. One potential reason for this is that Zn diffuses rapidly when heated, which can result in imbalanced diffusion with a consequent void formation due to the Kirkendall effect . Another observation is that no change in contrast arises that delineates the ZnO interfacial layer from subsequently deposited ZnMgO (Figure c).…”

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confidence: 99%

Effect of ZnO Interfacial Seed Layer in Sol–Gel Grown ZnMgO Ferroelectric

Dalba,

Zhang,

et al. 2024

ACS Appl. Electron. Mater.

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High remanent polarization observed in ferroelectric ZnMgO shows promise for ferroelectric memory devices made of low-cost, earth-abundant materials and is capable of a large memory window. To address the low performance of devices fabricated using low-cost sol−gel processing, an interfacial-structure-based approach to improve crystallinity in ZnMgO thin films was chosen. In this study, we demonstrate an increase of 182% in achievable remanent polarization coinciding with higher crystallinity and a larger ratio of ferroelectric wurtzite phase in sol−gel deposited Zn 1−x Mg x O (x = 0.35) films grown on an interfacial ZnO seed layer, through characterization of ferroelectric behavior via piezoresponse force microscopy and positive-up−negative-down measurements. Although the interfacial structure is not preserved after annealing, an improved remanent polarization of 0.699 μC/cm 2 at a coercive field of 1 MV/cm is achieved in a sol−gel ZnMgO thin film through the addition of a ZnO buffer during processing.

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Byproduct-free mass production of compound semiconductor nanowires: zinc phosphide

Chen¹,

Polinnaya²,

Vaddiraju³

2018

Mater. Res. Express

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Kirkendall void formation and selective directional growth of urchin-like ZnO/Zn microspheres through thermal oxidation in air

Abstract: Microparticles with nanostructures on the surface have the characteristics of nanomaterials, yet they avoid aggregation and dispersion problems due to the nature of the nanomaterials.

Cited by 3 publications

References 82 publications

Hydrothermal oxidation synthesis of rod‐like ZnO and the influence of oxygen vacancy on photocatalysis

Hydrothermal oxidation synthesis of rod‐like ZnO and the influence of oxygen vacancy on photocatalysis

Effect of ZnO Interfacial Seed Layer in Sol–Gel Grown ZnMgO Ferroelectric

Byproduct-free mass production of compound semiconductor nanowires: zinc phosphide

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