Synthesis of Nanogroove‐Network‐Structured Platinum Nanosheets and Their Carbon‐Supported Forms Using a Mixed‐Surfactant Templating Approach

Sakai, Go; Yoshimura, Teizo; Isohata, Shusaku; Uota, Masafumi; Kawasaki, Hideya; Kuwahara, Taishi; Fujikawa, Daisuke; Kijima, Toshiki

doi:10.1002/adma.200601127

Cited by 30 publications

(28 citation statements)

References 34 publications

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“…The Tween-80-based single surfactant mixtures for x 1 ¼ 40-80 were thus identified as a hexagonal LLC phase with a rod-to-rod distance of as large as $ 8.6 nm for their most stable one, in marked contrast to layered LLCs formed in the Tween 60/H 2 O single surfactant system. [9,25] This is because the oleic chains of Tween 80 molecules with their cis-unsaturated conformations prefer their loose packing compared with the close-packed straight-bilayered structure constructed by the stearyl chains of Tween 60 with their trans-zigzag conformation. [28] On the other hand, the C 12 EO 9 /Tween 80/H 2 O mixed surfactant compositions at a 1:1:x 2 molar ratio also formed a hexagonal LLC phase over a wide range of x 2 ¼ 60-120 and the parameter a increased from 7.3 to 8.0 nm with an increase of water content (Fig.…”

Section: Structural Characterization Of Precursory Tween-80-based Sinmentioning

confidence: 99%

“…[5] This is the case for their use in electrocatalysis [6,7] and actually a few studies have devoted to the loading of Pt nanostructures as the electrode materials of PEFCs. [8][9][10] Various methods have been developed for the control in nanometerscales of Pt particles. Size-and shapecontrolled Pt nanoparticles, including cubic, tetrahedral, icosahedral, and cubooctahedral nanocrystals, have been prepared by the polyol method or its combined use of capping polymers to induce anisotropic growth of their different facets.…”

Section: Introductionmentioning

confidence: 99%

“…[24] In this 3D LLC system, equimolar amounts of Tween 60 and C 12 EO 9 surfactant molecules are combined into a hexagonal array of cylindrical rodlike micelles and the aqueous shell of the rodlike micelles is so thick that the reduced metal grow into nanotubes separately within the aqueous shell. More recently, nanogroove-network structured single-crystalline Pt nanosheets were synthesized by the borohydride reduction of Pt-salts using the same mixed surfactant LLC templates, [9] whereas the Tween 60 single surfactant system produced a layered LLC template for the growth of 2D dendritic polycrystalline Pt nanosheets. [9,25] On the other hand, the hydrazine reduction of a Pt-salt confined to the 2D hemicylindrical micelles of Tween 60 at aqueous solution/graphite interfaces yielded single-crystalline Pt nanosheets with a uniform thickness of ca.…”

Section: Introductionmentioning

confidence: 99%

“…More recently, nanogroove-network structured single-crystalline Pt nanosheets were synthesized by the borohydride reduction of Pt-salts using the same mixed surfactant LLC templates, [9] whereas the Tween 60 single surfactant system produced a layered LLC template for the growth of 2D dendritic polycrystalline Pt nanosheets. [9,25] On the other hand, the hydrazine reduction of a Pt-salt confined to the 2D hemicylindrical micelles of Tween 60 at aqueous solution/graphite interfaces yielded single-crystalline Pt nanosheets with a uniform thickness of ca. 3.5 nm and several micrometer sizes.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of Nanohole‐Structured Single‐Crystalline Platinum Nanosheets Using Surfactant‐Liquid‐Crystals and their Electrochemical Characterization

Kijima

Takemoto

et al. 2009

Adv Funct Materials

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Nanohole‐structured single‐crystalline Pt nanosheets have been synthesized by the borohydride reduction of Na2PtCl6 confined to the lyotropic liquid crystals (LLCs) of polyoxyethylene (20) sorbitan monooleate (Tween 80) with or without nonaethylene‐glycol (C12EO9). The Pt nanosheets of around 4–10 nm in central thickness and up to 500 nm or above in diameter have a number of hexagonal‐shaped nanoholes ∼1.8 nm wide. High‐resolution electron microscope images of the nanosheets showed atomic fringes with a spacing of 0.22 nm indicating that the nanosheets are crystallographically continuous through the nanoholed and non‐holed areas. The inner‐angle distributions for the hexagonal nanoholes indicate that the six sides of the nanoholes are walled with each two Pt (111), Pt (1${\bar {1}}$1) and Pt (010) planes. The formation mechanism of nanoholed Pt nanosheets is discussed on the basis of structural and compositional data for the resulting solids and their precursory LLCs, with the aid of similar nanohole growth observed for a Tween 80 free but oleic acid‐incorporated system. It is also demonstrated that the nanoholed Pt nanostructures loaded on carbon exhibit fairly high electrocatalytic activity for oxygen reduction reaction and a high performance as a cathode material for polymer‐electrolyte fuel cells, along with their extremely high thermostability revealed through the effect of electron‐irradiation.

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Section: Structural Characterization Of Precursory Tween-80-based Sinmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synthesis of Nanohole‐Structured Single‐Crystalline Platinum Nanosheets Using Surfactant‐Liquid‐Crystals and their Electrochemical Characterization

Kijima

Takemoto

et al. 2009

Adv Funct Materials

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“…Next, the nanogroove-network-structured single-crystalline Pt nanosheets were obtained by the reduction of Na 2 PtCl 6 confined to the mixed LLCs using NaBH 4 as the reductant. The nanosheets were composed of pseudo 2-D irregular Pt networks, in which Pt nanoleaves were loosely interconnected with crystallographic alignment to form an irregular network of nanogrooves [102]. Recently, Kijima et al synthesized nanohole-structured single-crystalline Pt nanosheets by the borohydride reduction of Na 2 PtCl 6 confined to the LLCs [103].…”

Section: -D Nanostructuresmentioning

confidence: 99%

Lyotropic liquid crystal directed synthesis of nanostructured materials

Wang

Chen

Jiao

2009

Science and Technology of Advanced Materials

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This review introduces and summarizes lyotropic liquid crystal (LLC) directed syntheses of nanostructured materials consisting of porous nanostructures and zero-dimensional (0-D), one-dimensional (1-D) and two-dimensional (2-D) nanostructures. After a brief introduction to the liquid crystals, the LLCs used to prepare mesoporous materials are discussed; in particular, recent advances in controlling mesostructures are summarized. The LLC templates directing the syntheses of nanoparticles, nanorods, nanowires and nanoplates are also presented. Finally, future development in this field is discussed.

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Approaches to the Synthesis and Characterization of Spherical and Anisotropic Platinum Nanomaterials

Peng

Yang

2008

Nanotechnologies for the Life Sciences

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The basic principles and recent research findings on the synthetic approaches to shape control of platinum nanostructures are reviewed in this chapter. Various thermodynamic and kinetic parameters directly relevant to shape evolution and uniformity control during nucleation and growth are discussed. Attention is focused on those concepts related to the control of morphology, such as defect formation, and aimed at explaining those aspects that can go beyond the classical LaMer concepts which do not deal with the control of shapes. Sequential growth and defect formation, both of which relate to morphology, are given special attention. The chemical reagents used to achieve such control are reviewed to present a global view of the selection principles. Secondary growth, which may lead to anisotropic or higher‐ordered nanostructures, is presented as a new concept developed in recent years. The chapter further discusses the practical aspects of synthetic approaches to platinum nanostructures in both aqueous and nonhydrolytic systems. Detailed examples of synthetic and characterization approaches to zero‐, one‐, two‐ and three‐dimensional nanostructured platinum are also presented, and emerging topics on the shape control of platinum alloys and intermetallics are briefly discussed. The chapter concludes with some details of present knowledge of key recent developments on the shape control of platinum nanostructures.

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Synthesis of Nanogroove‐Network‐Structured Platinum Nanosheets and Their Carbon‐Supported Forms Using a Mixed‐Surfactant Templating Approach

Cited by 30 publications

References 34 publications

Synthesis of Nanohole‐Structured Single‐Crystalline Platinum Nanosheets Using Surfactant‐Liquid‐Crystals and their Electrochemical Characterization

Synthesis of Nanohole‐Structured Single‐Crystalline Platinum Nanosheets Using Surfactant‐Liquid‐Crystals and their Electrochemical Characterization

Lyotropic liquid crystal directed synthesis of nanostructured materials

Approaches to the Synthesis and Characterization of Spherical and Anisotropic Platinum Nanomaterials

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