TEM Studies of Platinum Nanowires Fabricated in Mesoporous Silica MCM-41

Liu, Zheng; Sakamoto, Yasuhiro; Ohsuna, Tetsu; Hiraga, Kenji; Terasaki, Osamu; Ko, Chang Hyun; Shin, Hyun June; Ryoo, Ryong

doi:10.1002/1521-3773(20000901)39:17<3107::aid-anie3107>3.0.co;2-j

Cited by 228 publications

(129 citation statements)

References 18 publications

(6 reference statements)

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“…To date several metallic nanowires of transition metals, such as Pt, Ag, Au, and bimetallic Pt/Rh, have been synthesized by using inorganic mesoporous materials and carbon nanotubes. For example, Pt nanowires with diameter of 30 Å were synthesized using mesoporous silica, MCM‐41, and their structures were characterized by transmission electron microscopy (TEM) 396. This nanowire is stable up to 500 °C in the channel.…”

Section: Nanospace Laboratoriesmentioning

confidence: 99%

Functional Porous Coordination Polymers

2004

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The chemistry of the coordination polymers has in recent years advanced extensively, affording various architectures, which are constructed from a variety of molecular building blocks with different interactions between them. The next challenge is the chemical and physical functionalization of these architectures, through the porous properties of the frameworks. This review concentrates on three aspects of coordination polymers: 1). the use of crystal engineering to construct porous frameworks from connectors and linkers ("nanospace engineering"), 2). characterizing and cataloging the porous properties by functions for storage, exchange, separation, etc., and 3). the next generation of porous functions based on dynamic crystal transformations caused by guest molecules or physical stimuli. Our aim is to present the state of the art chemistry and physics of and in the micropores of porous coordination polymers.

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Section: Nanospace Laboratoriesmentioning

confidence: 99%

Functional Porous Coordination Polymers

2004

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“…In the hard‐templating method, precise control over the structure of the replica is possible by tuning the morphology of the original mesoporous template. To date, various metal nanostructures, such as zero‐dimensional (0D) nanoparticles, one‐dimensional (1D) nanowires, and three‐dimensional (3D) nanowire networks, have been prepared with MCM‐41 ( p 6 mm ), SBA‐15 ( p 6 mm ), KIT‐6 ( Ia ‐3 d ), and MCM‐48 ( Ia ‐3 d ) as hard templates. By using the SBA‐15 hard template combined with ultraviolet–visible (UV–Vis) irradiation, nanoparticles and nanowires can be synthesized through the reduction of their respective metal precursors .…”

Section: Hard‐templating Methodsmentioning

confidence: 99%

Nanoarchitectures for Mesoporous Metals

et al. 2015

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The field of mesoporous metal nanoarchitectonics offers several advantages which cannot be found elsewhere. These materials have been showcasing impressive enhancements of their electrochemical properties for further implementation, compared to their micro- and macroporous counterparts. Since the last few decades, various methods have been developed to achieve narrow pore size distribution with a tunable porosity and particle morphology. While hard templates offer a reliable and intuitive approach to synthesize mesoporous metals, the complexity of the technique and the use of harmful chemicals pushed several research groups to focus in other directions. For example, soft templates (e.g., lyotropic crystals, micelles assemblies) and solution phase methods (requiring to control reduction reactions) offer more and more possibilities in terms of available compositions and morphologies. Indeed, various metal (Pt, Pd, Au, Ru, etc.) can now be synthesized as dendritic, core@shell, hollow or polyhedral nanoparticles, with single- or multicomponents, alloyed or not, with unprecedented electrochemical activity.

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“…Mesoporous metals and alloys with a desired mesostructure and composition can be prepared by selecting specific templates and metal sources. In most cases, the resulting product from the hard‐templating method exhibits high mechanical strength and thermal stability …”

Section: Introductionmentioning

confidence: 99%

Periodically Arranged Arrays of Dendritic Pt Nanospheres Using Cage‐Type Mesoporous Silica as a Hard Template

Kani

Malgras

Hossain

et al. 2017

Chemistry An Asian Journal

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Dendritic Pt nanospheres of 20 nm diameter are synthesized by using ah ighly concentrated surfactant assembly within the large-sized cage-type mesopores of mesoporous silica (LP-FDU-12). After diluting the surfactant solution with ethanol, the lower viscosity leads to an improved penetration inside the mesopores. After Pt deposition followed by template removal,t he arrangement of the Pt nanospheresi sareplication from that of the mesopores in the original LP-FDU-12 template. Although it is well known that ordered LLCs can form on flat substrates, the confined space inside the mesopores hinders surfactant self-organization. Therefore, the Pt nanospheresp ossess ad endritic porouss tructure over the entire area. The distortion observed in some nanospheresi sa ttributed to the close proximity existing between neighboring cage-type mesopores. This new type of nanoporous metal with ah ierarchical architectureh olds potential to enhance substance diffusivity/accessibility for further improvement of catalytic activity.

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TEM Studies of Platinum Nanowires Fabricated in Mesoporous Silica MCM-41

Cited by 228 publications

References 18 publications

Functional Porous Coordination Polymers

Functional Porous Coordination Polymers

Nanoarchitectures for Mesoporous Metals

Periodically Arranged Arrays of Dendritic Pt Nanospheres Using Cage‐Type Mesoporous Silica as a Hard Template

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