Direct bottom-up synthesis of size-controlled monodispersed single-layer magnesium hydroxide nanosheets modified with tripodal ligands

Muramatsu, Keisuke; Kamiusuki, Yuya; Kuroda, Yoshiyuki; Wada, Hiroaki; Shimojima, Atsushi; Kuroda, Kazuyuki

doi:10.1039/d1dt00207d

Cited by 5 publications

(8 citation statements)

References 21 publications

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“…We reported the direct preparation of brucite-type metal hydroxide nanosheets through the suppression of crystal growth along the stacking direction. , The important factor in achieving two-dimensional crystal growth is the strong covalent linkage between the organic modifiers and layer surfaces. Although the use of amine ligands has occasionally resulted in anisotropic crystal growth along the stacking direction, the preferential interaction of amine ligands with the edge surfaces of the layered crystals cannot be considered, and the role of amine ligands remains unknown.…”

Section: Results and Discussionmentioning

confidence: 99%

“…As examples to reduce the number of stacking sheets, direct synthesis of metal hydroxide nanosheets has also been reported by using organic modifiers. 24,25 To summarize, although the aspect ratio can be changed both by limiting the growth in the lateral direction and by reducing the number of stacks, examples of increasing the aspect ratio by preferential growth along the stacking direction are limited, as follows.…”

Section: Introductionmentioning

confidence: 99%

“…One example of the method is the use of a confined nanospace to restrict the direction of the crystal growth. , Although β-Ni(OH) 2 nanorods are synthesized in the cylindrical nanochannels of carbon-coated anodic alumina films, the long axis of the nanorods corresponds to the lateral direction. As examples to reduce the number of stacking sheets, direct synthesis of metal hydroxide nanosheets has also been reported by using organic modifiers. , To summarize, although the aspect ratio can be changed both by limiting the growth in the lateral direction and by reducing the number of stacks, examples of increasing the aspect ratio by preferential growth along the stacking direction are limited, as follows.…”

Section: Introductionmentioning

confidence: 99%

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Anisotropic Crystal Growth of Layered Nickel Hydroxide along the Stacking Direction Using Amine Ligands

et al. 2022

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Edge surfaces of two-dimensional crystals play crucial roles in their properties, such as intercalation behavior and catalytic activities; however, reports on the preparation of crystals with a high aspect ratio of thickness to lateral size, typically a prism-like crystal morphology composed of stacked layers, are scarce. We report the anisotropic crystal growth of β-Ni(OH) 2 along the stacking direction using bidentate amine ligands, which act as both the base and the reservoir of Ni 2+ through the formation of Ni−diamine complexes. Various characterization results of the crystal structure, composition, and crystal orientation indicate the formation of hexagonal prisms of β-Ni(OH) 2 with an unusually high aspect ratio of the thickness to the lateral size higher than 1. A systematic investigation focusing on the molar ratio of amine ligands to Ni 2+ , the concentration of Ni−diamine complexes, and stability constants of the complexes revealed that anisotropic growth was promoted when the supersaturation was relatively high and was maintained constant for a long time. We clarified the role of amine ligands in controlling supersaturation through the controlled release of metal ions from stable complexes. β-Co(OH) 2 with a hexagonal prism shape was prepared using this protocol. This study provides valuable indications for developing synthetic chemistry for various layered compounds to achieve a controlled aspect ratio.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Anisotropic Crystal Growth of Layered Nickel Hydroxide along the Stacking Direction Using Amine Ligands

et al. 2022

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“…As top-down processes include iScience Article the exfoliation in the vertical direction and fracture in the lateral direction, the monodispersed nanosheets are not easily obtained. On the other hand, a recent paper shows bottom-up synthesis of magnesium hydroxide nanosheets with an assistance of ligands (Muramatsu et al, 2021). If monodispersed and thin nanosheets are required, bottom-up synthesis can be a potential route rather than top-down exfoliation.…”

Section: Discussionmentioning

confidence: 99%

Selective syntheses of thick and thin nanosheets based on correlation between thickness and lateral-size distribution

2022

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“…21 Subsequent studies enabled a change of the modifier molecules and direct synthesis of submicrometer-sized monolayer metal hydroxides. 22,23 However, the control of the nanosheet size on the single nanometer scale with various modifier molecules has not yet been reported. Therefore, it is still difficult to tune both the size and chemical composition of metal hydroxide monolayer nanoparticles.…”

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confidence: 99%

Metal Hydroxide Salt Monolayer Nanoparticles: Synthesis, Redox Characterization, and Electrochemical Catalytic Performance

Tarutani

Kimura

Sakata

et al. 2022

ACS Materials Lett.

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Two-dimensional materials modified with low molecular weight species are known to show unique electronic properties. In this study, we focus on the synthesis and electrochemical investigation of metal hydroxide salt monolayer nanoparticles modified with different molecules toward improved electrochemical functions. Nickel hydroxide carboxylate nanoparticles were successfully prepared through the epoxide-mediated alkalinization method using alkylcarboxylates. It was found that the monolayer nanoparticles with a size of approximately 2 nm were formed directly from an ionic precursor or after ultrasonication post-treatment. Manganese, iron, and cobalt hydroxide carbonates were found to form monolayer nanoparticles through the same procedure. Synthesized nickel hydroxide carbonate monolayer nanoparticles with a short alkylcarboxylate showed enhanced redox processes and electrochemical functions due to higher proton diffusion coefficient, lower electron transfer resistance, and improved intrinsic catalytic activity. We propose that the results obtained in this study will provide a novel design strategy for metal hydroxide monolayer nanoparticulate catalysts toward high functionality.

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Direct bottom-up synthesis of size-controlled monodispersed single-layer magnesium hydroxide nanosheets modified with tripodal ligands

Abstract: Conventional top-down methods for preparing inorganic nanosheets possess fundamental challenges of morphological control. Herein, the direct synthesis of organically modified single-layer magnesium hydroxide nanosheets with narrow size distribution was achieved...

Cited by 5 publications

References 21 publications

Anisotropic Crystal Growth of Layered Nickel Hydroxide along the Stacking Direction Using Amine Ligands

Anisotropic Crystal Growth of Layered Nickel Hydroxide along the Stacking Direction Using Amine Ligands

Selective syntheses of thick and thin nanosheets based on correlation between thickness and lateral-size distribution

Metal Hydroxide Salt Monolayer Nanoparticles: Synthesis, Redox Characterization, and Electrochemical Catalytic Performance

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