Preparation of Pt Nanosheets Using Graphene Oxide

Tanaka, Sakae; Arita, Hiroki; Sugiyama, Kojiro; Nakatani, Keiko

doi:10.1246/cl.180414

Cited by 6 publications

(9 citation statements)

References 20 publications

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“…The physically confined Pt nanoplatelets should be bonded to give NSs. The surface of the PtNSs could be stable, unlike the previously reported single-crystalline PtNSs …”

Section: Results and Discussioncontrasting

confidence: 67%

“…The surface of the PtNSs could be stable, unlike the previously reported single-crystalline PtNSs. 37 We measured the u-dependence of the obtained particle size, as shown in Table S2. The width and thickness of the PtNSs for each of several synthetic conditions were measured using AFM, as shown in Figure S12, and the size distribution of these PtNSs was estimated from DLS measurements, as shown in Figure S13.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Mechanochemical Synthesis of Dispersible Platinum Nanosheets for Enhanced Catalysis in a Microreactor

Sasaki

Miyake

Uchida

et al. 2022

ACS Appl. Nano Mater.

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Nanosheet fabrication usually requires some self-assembly process of the ingredients themselves or self-assembled templates to lead to the local anisotropy. Macroscopic forces and dynamics cannot usually generate the local anisotropy to synthesize nanosheets in a solution because the anisotropies of the macroscopic mechanical forces and dynamics are promptly relaxed in the molecular scale in a liquid phase. Here, we report the mechanochemical synthesis of dispersible platinum nanosheets (PtNSs) using a microreactor. This work is the first example of bottom-up nanosheet synthesis of a nonexfoliable compound in a microflow reactor. The nanosheets grow through the lateral fusion of nanoplatelets in the hydrophilic space of the stable hyperswollen lyotropic lamellar (HL) phase of a surfactant solution. The lateral fusion is accelerated as the flow rate increases because the area of the bilayer in the HL phase increases with shear stress. The mechanical energy to promote the growth of the PtNSs can also be extracted in different ways. Most simply, syringe pumps electrically generate it. We also illustrate mechanochemical synthesis using gravity, the most universal and eco-friendly energy source on the earth. It is also the first example of the fabrication of anisotropic nanoparticles using gravity. Larger PtNSs show higher catalytic activity for the reduction reaction from 4-nitrophenol to 4-aminophenol due to their dispersibility; surprisingly, the exponential increase of the fusion patterns of nanoplatelets dramatically reduces the agglomeration of PtNSs. These PtNSs perform better in catalysis and should be promising for hydrogen production, fuel cells, and sensors because of their large surface area and dispersibility. This method could open up a pathway to valuable nanosheets.

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“…The physically confined Pt nanoplatelets should be bonded to give NSs. The surface of the PtNSs could be stable, unlike the previously reported single-crystalline PtNSs …”

Section: Results and Discussioncontrasting

confidence: 67%

Section: ■ Results and Discussionmentioning

confidence: 99%

Mechanochemical Synthesis of Dispersible Platinum Nanosheets for Enhanced Catalysis in a Microreactor

Sasaki

Miyake

Uchida

et al. 2022

ACS Appl. Nano Mater.

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show abstract

“…These carbon structures can serve as both reducing agents and templates, as graphene sheets can be used to confine the growth. A one-pot solvothermal synthesis was developed to prepare Pt nanosheets using H 2 PtCl 6 as the precursor and GO in cyclohexane . Nanosheets were formed by heating the solution in a Teflon-lined stainless-steel autoclave at 180 °C for 6 h. Micelles, shaped salt crystals, and NiFe-LDH nanosheets are some of the suitable 2D templates.…”

Section: Materials Developments Of 2d Metal Nanosheetsmentioning

confidence: 99%

Two-Dimensional Metal Nanostructures: From Theoretical Understanding to Experiment

Zhang

Yang

2023

Chem. Rev.

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This paper reviews recent studies on the preparation of two-dimensional (2D) metal nanostructures, particularly nanosheets. As metal often exists in the high-symmetry crystal phase, such as face centered cubic structures, reducing the symmetry is often needed for the formation of low-dimensional nanostructures. Recent advances in characterization and theory allow for a deeper understanding of the formation of 2D nanostructures. This Review firstly describes the relevant theoretical framework to help the experimentalists understand chemical driving forces for the synthesis of 2D metal nanostructures, followed by examples on the shape control of different metals. Recent applications of 2D metal nanostructures, including catalysis, bioimaging, plasmonics, and sensing, are discussed. We end the Review with a summary and outlook of the challenges and opportunities in the design, synthesis, and application of 2D metal nanostructures.

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“…Furthermore, it is known that the thickness of metal nanosheets has a significant impact on their structures and properties, and the sub-nm level thickness control is an important issue. 13 Although many methods have been proposed to synthesize Pt metal nanosheets, 15,[29][30][31][32][33][34][35][36][37][38][39] the thickness and morphology control still remain challenging issues. In order to control the thickness of the molecularly thin nanosheets, we investigated the relationship of thickness between the 2D surfactant crystals and Pt metal nanosheets.…”

Section: The Synthesis Of Pt Metal Nanosheets With Varied Thicknesses...mentioning

confidence: 99%

Tailored synthesis of molecularly thin platinum nanosheets using designed 2D surfactant solids

et al. 2022

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Preparation of Pt Nanosheets Using Graphene Oxide

Cited by 6 publications

References 20 publications

Mechanochemical Synthesis of Dispersible Platinum Nanosheets for Enhanced Catalysis in a Microreactor

Mechanochemical Synthesis of Dispersible Platinum Nanosheets for Enhanced Catalysis in a Microreactor

Two-Dimensional Metal Nanostructures: From Theoretical Understanding to Experiment

Tailored synthesis of molecularly thin platinum nanosheets using designed 2D surfactant solids

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