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Noble metal nanotube and method for preparation thereof

a nanotube and noble metal technology, applied in the field of new metals having a nanotube structure, can solve the problems of difficult to achieve, and no previous cases of applying such complex effects to the template synthesis

Inactive Publication Date: 2005-10-20
JAPAN SCI & TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0037] FIGS. 1(A)-1(B) are observation views of nanotubes of the present invention taken by a transmission electron microscope, wherein FIG. 1(A) is an observation view of a platinum nanotube obtained in Example 1, taken by the transmission electron microscope, FIG. 1(B) is an observation view of a palladium nanotube obtained in Example 2, taken by the transmission electron microscope, and FIG. 1(C) is an observation view of a silver nanotube obtained in Example 3, taken by the transmission electron microscope.

Problems solved by technology

However, it is difficult to achieve this according to the method discovered by Martin et al.
However, there have been no previous cases of applying such complex effects to the template synthesis.

Method used

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  • Noble metal nanotube and method for preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0041] Nonaethylene glycol monododecyl ether (C12 EO9) was dropped into aqueous solution of chloroplatinic acid (H2PtCl6) taken in a test tube and was heated to 60° C. Further, polyoxyethylene (20) sorbitan monostearate (tween60, trade name; available from Wako Pure Chemical Industries, Ltd.) was added. After the test tube was shaken in water bath of 60° C. for three minutes, the test tube was left in air constant-temperature bath of 25° C. for two minutes. This procedure was repeated three times.

[0042] The test tube was left at 25° C. for twenty minutes, thereby preparing reaction mixture of feeding molar ratio H2PtCl6:C12EO9:tween60:H2O=1:1:1:60. Hydrazine of which molar ratio was 16 times as much as the chloroplatinic acid was dropped into the reaction mixture at the same temperature and was reacted for 24 hours. Fine solid phase deposition was centrifuged, after that, washed with water, then washed with ethanol, and dried, thereby obtaining black powder.

[0043] The powder was o...

example 2

[0044] Nonaethylene glycol monododecyl ether (C12 EO9) was dropped into aqueous solution of palladium chloride (PdCl2) taken in a test tube and was heated to 60° C. Further, polyoxyethylene (20) sorbitan monostearate (tween60, trade name; available from Wako Pure Chemical Industries, Ltd.) was added. After the test tube was shaken in water bath of 60° C. for 15 minutes, the test tube was cooled to 25° C. and left at this temperature for twenty minutes, thereby preparing reaction mixture of feeding molar ratio PdCl2:C12EO9:tween60:H2O=1:1:1:60. Hydrazine of which molar ratio was 16 times as much as the palladium chloride was dropped into the reaction mixture at the same temperature and was reacted for 24 hours.

[0045] Fine solid phase deposition was centrifuged, after that, washed with water, then washed with ethanol, and dried, thereby obtaining black powder.

[0046] The powder was observed by the transmission electron microscope and it was confirmed that the major product of the pow...

example 3

[0047] Sodium dodecylsulfate (SDS) was added to 0.056M nitric acid solution of silver nitrate (AgNO3) taken in a test tube and was heated to 60° C. so as to obtain uniform solution. Further, polyoxyethylene (20) sorbitan monostearate (tween60, trade name; available from Wako Pure Chemical Industries, Ltd.) was added to the solution. After the test tube was shaken for ten minutes, the test tube was cooled to 25° C., thereby preparing reaction mixture of feeding molar ratio AgNO3:SDS:tween60:H2O (0.056M HNO3)=1:1:1:60. Hydrazine of which molar ratio was 16 times as much as the silver nitrate was dropped into the reaction mixture at the same temperature and was reacted for 24 hours. Fine solid phase deposition was centrifuged, after that, washed with water, then washed with ethanol, and dried, thereby obtaining gray powder.

[0048] The powder was observed by the transmission electron microscope and it was confirmed that the major product of the powder was tubular particle of about 7 nm ...

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Abstract

A nanotube of which basic skeleton is made of a noble metal element is provided. The skeleton of the nanotube is made of (1) a single noble metal element of gold (Au), silver (Ag), platinum (Pt), palladium (Pd), rhodium (Rh), or iridium (Ir) as noble metal elements, of (2) a mixture in which (Ru) is added to the above (1) in any proportion, or of (3) a mixture in which a base metal element is added to the above (1) or (2) in any proportion, and the noble metal nanotube has a tubular form of about 5-7 nm in outer diameter, about 2-4 nm in inner diameter, about 1-2 nm in thickness, and 10 nm or more in length.

Description

TECHNICAL FIELD [0001] The present invention relates to a new metal having a nanotube structure which mainly consists of a noble metal element which can be used as various catalysts for chemical reactions in industrial and environmental fields of such as fuel-cell catalyst and automotive exhaust catalyst, various electrodes for electrochemical reaction such as electrolysis electrode, base materials or functional elements for photonics / electronics / information technologies such as temperature, pressure, gas sensor elements, paste for manufacturing electro electronics devices, electrical resistive elements for electronic parts, permanent magnet, components of a microreactor, and substance-storing material, utilizing their chemical, electrochemical and magnetic characteristics of the noble metal element. BACKGROUND OF THE INVENTION [0002] Noble metal elements have excellent workability, heat resistance, oxidation resistance, corrosion resistance, electrochemical characteristics, and, re...

Claims

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Application Information

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IPC IPC(8): B82B1/00B22F1/00B22F9/24B82B3/00H01B1/22H01M4/90H01M4/92
CPCB22F1/0025B22F9/24B22F2001/0029B22F2999/00B82Y30/00B22F2202/11B22F1/0549B22F1/0547
Inventor KIJIMA, TSUYOSHI
Owner JAPAN SCI & TECH CORP
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