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Single Crytalline Noble Metal Ultrathin-Film-Like Nanoparticle Formed in Adsorbed Micelle Film as Reaction Filed Formed at Solid-Liquid Interface, and Production Method Thereof

a technology of noble metals and nanoparticles, applied in the direction of catalyst activation/preparation, metal/metal-oxide/metal-hydroxide catalysts, etc., can solve the problems of high production quantities of noble metal elements, particularly pt materials, and the difficulty of sufficiently addressing a demand, etc., to achieve the effect of extreme fine precision

Inactive Publication Date: 2008-07-10
JAPAN SCI & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0113]Unlike the conventional noble metal particles, the present invention provides the noble metal nanoparticles with only an extremely small amount of platinum source by virtue of the above-mentioned unique synthesis process, and the present invention can provide composites each including a carrier substrate and single crystalline ultrathin-film nanoparticles of noble metal represented by platinum and carried on the carrier substrate, in a manner that the nanoparticles exhibit unique and novel ultrathin-film shapes having controlled forms, sizes, and arrangements and are controlled to have thicknesses in “nm” ranges with an extremely fine precision. Even without separation of the noble metal nanoparticles from the composites, such composites can be each directly and exemplarily utilized in themselves as: a fuel cell-oriented catalyst configured to react hydrogen with oxygen and to extract electrical energy; a catalyst such as utilized in vehicular exhaust gas purification, petrochemical industry, synthesis gas production, production of medicine and fat and oil, and the like; and an ultra fine sensor material, electrode material, and the like; so that the composites are expected to remarkably contribute to development of the industry.

Problems solved by technology

However, the production amounts of noble metal elements, particularly Pt material, are extremely low such that it will be considerably hard to sufficiently deal with a demand to be expected from now on mainly based on fuel cells insofar as in view of the existent amount of the resource and the development level at present.
Thus, it is worried that the situation is urgent.

Method used

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  • Single Crytalline Noble Metal Ultrathin-Film-Like Nanoparticle Formed in Adsorbed Micelle Film as Reaction Filed Formed at Solid-Liquid Interface, and Production Method Thereof
  • Single Crytalline Noble Metal Ultrathin-Film-Like Nanoparticle Formed in Adsorbed Micelle Film as Reaction Filed Formed at Solid-Liquid Interface, and Production Method Thereof
  • Single Crytalline Noble Metal Ultrathin-Film-Like Nanoparticle Formed in Adsorbed Micelle Film as Reaction Filed Formed at Solid-Liquid Interface, and Production Method Thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0151]Added into a weighing bottle was 10 mL of a weighed water solution (0.5 mM) of polyoxyethylene (20) sorbitan monostearate (Tween60: product name sold by Atlas Powder Company in U.S.). Immersed into this solution was a highly oriented graphite substrate (HOPG), thereby causing semicylindrical rod-like micelles to be spontaneously formed at a graphite / solution interface.

[0152]Next, 1 mL of hexachloro platinate water solution (0.1 M) was added, thereby establishing a reaction solution. At this time, rod-like micelles adsorbed on the graphite substrate surface cooperated with platinum complex compounds to form composites which acted as templates for growth of thinfilm-like platinum particles. FIG. 2 shows images observed within a liquid by an atomic force microscope (AFM) of shapes of rod-like micelles formed at a graphite / solution interface.

[0153]Subsequently, 1.5 molar equivalent of hydrazine relative to chloroplatinic acid was added to the reaction solution held at 25° C. to co...

example 2

Concentration Effect of Chloroplatinic Acid Water Solution on Production of Platinum Thinfilm-Like Particle in Sheet-Like Shape

[0157]Semicylindrical rod-like micelles were spontaneously formed at graphite / solution interfaces, by the same procedures and under the same conditions as Example 1, respectively. Next, added into the water solutions including precursory rod-like micelles at the graphite substrate surfaces, were chloroplatinic acid water solutions so as to attain their concentrations of 0.02 mM, 0.1 mM, 1 mM, and 10 mM, respectively.

[0158]Next, 2 molar equivalent of hydrazine relative to chloroplatinic acid was added into each reaction solution held at 25° C., followed by reaction for 24 hours as it was. In this way, thinfilm-like platinum particles were grown within rod-like micelles immobilized on the graphite substrates, respectively. At this time, the graphite substrates were downwardly oriented and fixed, to avoid deposition of massive platinum particles produced in the...

example 3

Production of Platinum Thinfilm-Like Particle in Sheet-Like Shape by Two-Kind Mixed Surfactant System

[0160]Semicylindrical rod-like micelles were spontaneously formed at graphite / solution interfaces, by the same procedures and under the same conditions as Example 1, respectively, by each adopting a two-kind mixed system of Tween60 and nonaethyleneglycol monohexadecyl ether (C12EO9: product name: Nikkol BL-9EX by Wako, Japan) as surfactants, instead of Tween60 only. The whole concentrations of surfactants were fixed at 0.5 mM, and the mole fractions (γ) of Tween60 in the two-kind mixed systems were varied, respectively.

[0161]Next, 1.5 molar equivalent of hydrazine relative to chloroplatinic acid was added into each reaction solution held at 25° C., followed by reaction for 24 hours as it was. In this way, thinfilm-like platinum particles were grown within rod-like micelles immobilized on the graphite substrates, respectively. At this time, the graphite substrates were downwardly orie...

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Abstract

It is aimed at creating noble metal nanoparticles having novel shapes, sizes, and arrangements usable for catalysts, electrodes, and the like.Micelles made into rod-like shapes having semicylindrical cross-sections are formed on a carrier substrate in a self-creating manner and immobilized thereon; noble metal ions are added and diffused in the micelles to complex the micelles with noble metal ions; and a reducing agent is subsequently caused to act thereon to progress a reductive reaction of noble metal within the immobilized micelles as reaction fields, thereby growing single crystalline noble metal ultrathin-film nanoparticles on the carrier substrate by utilizing the fixed micelles having the shapes as templates, respectively.

Description

TECHNICAL FIELD[0001]The present invention relates to a novel noble metal ultrathin-film-like nanoparticle including, as a main component, noble metal such as platinum usable as: a catalyst to be used in various chemical reactions; an electrode to be provided for various electrochemical reactions, such as an electrolysis electrode; and a fundamental material or functional element for photonics, electronics, and information technologies such as temperature, pressure, and gas sensor elements; in various industries and environmental fields such as fuel cell-oriented catalyst, and catalyst for treatment of vehicular exhaust gas, utilizing chemical, electrochemical, and magnetic characteristics of metal platinum; and also relates to a production method of such a noble metal ultrathin-film-like nanoparticle.BACKGROUND ART[0002]Noble metal elements have excellent workability, heat resistance, oxidation resistance, corrosion resistance, electrochemical property, and unique magnetism, and sp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C22C5/00C22C5/02C22C5/06C22C5/04B22F1/054B22F1/068
CPCB01J23/38B01J35/0013B22F2998/00B01J37/0215B01J37/03B22F1/0018B22F1/0055B22F9/24B82Y30/00C25B11/0473H01M4/885H01M4/92H01M2008/1095Y02E60/50B22F2001/0033B22F1/0025C25B11/081B22F1/0551B22F1/054B22F1/068B01J35/23B22F1/0547
Inventor KIJIMA, TSUYOSHIKAWASAKI, HIDEYA
Owner JAPAN SCI & TECH CORP
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