ZnO nano-rectangular framework-like structure from zinc hydroxide acetate plates

Hosono, Eiji; Tokunaga, Takashi; Ueno, S.; Oaki, Yuya; Imai, Hiroaki; Zhou, Haoshen; Fujihara, Shinobu

doi:10.2109/jcersj2.120.171

Cited by 9 publications

(7 citation statements)

References 26 publications

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“…It is considered that the two-hemisphere-like particles are ZnO, because the plate-like morphology is assumed to be zinc hydroxide such as LHZA, which possesses a layered crystal structure. 27,43 Although unidentified peaks are observed at early stage of 5 h and 10 h in XRD patterns, the growth of ZnO particles are focused in this paper. As the aging time is increased, the LHZA plates are not observed and the twohemisphere-like ZnO particles grow.…”

Section: Resultsmentioning

confidence: 99%

Crystal-Growth Process of Single-Crystal-like Mesoporous ZnO through a Competitive Reaction in Solution

Hosono

Tokunaga

Ueno

et al. 2012

Crystal Growth & Design

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A novel crystal-growth system and morphology control of ZnO are achieved by using cetyltrimethylammonium chloride (CTAC), a general surfactant, in a new role. We synthesize ZnO via the layered hydroxide zinc acetate (LHZA) in ethanolic-aqueous zinc acetate solution. The CTAC surfactant plays three roles in the nucleation and crystal growth. First, it suppresses the formation of a strong concentration gradient in the solution. Second, it reduces the rates of nucleation and crystal growth of LHZA through diffusion-rate control in the solution. Finally, it expedites the formation of ZnO by increasing the solution pH. The competitive reaction, controlled by CTAC, between the nucleation and crystal growth of LHZA and the formation and crystal growth of ZnO results in the formation of a novel ZnO morphology. This morphology is composed of layered, nearly spherical particles, which are formed by the stacking of nanosheets with single-crystal-like, mesoporous structures.

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Section: Resultsmentioning

confidence: 99%

Crystal-Growth Process of Single-Crystal-like Mesoporous ZnO through a Competitive Reaction in Solution

Hosono

Tokunaga

Ueno

et al. 2012

Crystal Growth & Design

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“…As shown in Figure 1(a), ZnO diffraction peaks were rarely observed for the precipitates obtained at pH 6. On the other hand, sharp diffraction peaks from ZnO appeared in the patterns of ZHA samples obtained at pH 7 and 9 [17][18][19]. A portion of the precipitates prepared at pH 7 and aged at over 90°C transformed to ZnO.…”

Section: Methodsmentioning

confidence: 98%

“…These hexagonal columnar crystals were deduced to be ZnO by contrasting the SEM observations and XRD patterns of precipitates obtained at pH 7 and pH 9 ( Figure 1). The pyrolysis of ZHA occurs under the hydrothermal conditions and the nucleation of ZnO occurs on the outer sides of the hexagonal column [18][19][20].…”

Section: Methodsmentioning

confidence: 99%

Effect of pH and aging temperature on the phosphorus removal properties of layered hydroxide synthesized from zinc acetate

Agario

Shiomi

2018

Journal of Asian Ceramic Societies

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Zinc hydroxide acetate (ZHA) is a promising material for anion exchange applications because it has a layered structure with intercalating CH 3 COO − and H 2 O. ZHA can be synthesized through a direct precipitation method by adding sodium hydroxide solution to a Zn(OCOCH 3) 2 solution. In this study, ZHAs were synthesized under various conditions and tested as phosphorous removal agents. The ZHA precipitates were obtained at pH 6, 7, and 9. They were then aged at 25°C, 60°C, 90°C, and 120°C under hydrothermal conditions. At pH 6, nearly pure single-phase ZHAs were obtained regardless of the aging temperature. On the other hand, most of the ZHAs that were prepared at higher pH and aged at higher temperature were transformed to ZnO. For the phosphorous removal experiments, the single-phase ZHA precipitates removed approximately 99% of the phosphate ions in a 100 mg L −1 phosphorous solution, and the phosphorus removal efficiency decreased with increasing amounts of ZnO. Therefore, ZHAs that were prepared at lower pH and aged at lower temperatures contained little to no ZnO, thereby showing high phosphorous removal capabilities.

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“…The pyrolytic conversion of metal hydroxides to metal oxides is another interesting approach to obtain shape-controlled materials. 22) In particular, layered hydroxide compounds based on divalent and/or trivalent transition metal ions, namely, Co(OH) 2 and CoNi layered double hydroxides, can be synthesized by the homogeneous precipitation using a hydrolysis reaction. 23),24) These hydroxides are well-oriented and converted into pertinent oxides with atomic relative positions remaining almost unchanged.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of p-type semiconducting NiCo<sub>2</sub>O<sub>4</sub> thin films using hydroxide nanoplatelet precursors and their application to N749-sensitized photocathodes

Miyachi

Hagiwara

Fujihara

2021

J. Ceram. Soc. Japan

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is promising as one of the p-type oxide semiconductors for practical applications in optoelectronic devices. In this study, we have elaborated NiCo 2 O 4 hexagonal nanoplatelet films and examined their photovoltaic properties. The film fabrication was actually achieved by four steps: the synthesis of hexagonal nanoplatelets of a Ni 1/3 Co 2/3 (OH) 2 precursor, the dispersion of the nanoplatelets in liquid media, the self-assembly of the nanoplatelets on dipped substrates, and the topological conversion of the hydroxide to the oxide by the heat treatment. The resultant NiCo 2 O 4 thin films had structural features such as the crystallographic (111) orientation, the high specific surface area, and the high light-scattering ability. As a result, the NiCo 2 O 4 thin films loaded with an N749 dye could work effectively as photocathodes in the configuration of dye-sensitized solar cells.

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ZnO nano-rectangular framework-like structure from zinc hydroxide acetate plates

Cited by 9 publications

References 26 publications

Crystal-Growth Process of Single-Crystal-like Mesoporous ZnO through a Competitive Reaction in Solution

Crystal-Growth Process of Single-Crystal-like Mesoporous ZnO through a Competitive Reaction in Solution

Effect of pH and aging temperature on the phosphorus removal properties of layered hydroxide synthesized from zinc acetate

Fabrication of p-type semiconducting NiCo<sub>2</sub>O<sub>4</sub> thin films using hydroxide nanoplatelet precursors and their application to N749-sensitized photocathodes

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