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Metal microparticle, composition containing the same and process for producing metal microparticle

A technology of metal particles and manufacturing methods, applied in the field of nano-sized rod-shaped gold particles, metal particle compositions, and metal particle manufacturing, which can solve problems such as slow reaction time

Active Publication Date: 2006-10-11
MITSUBISHI MATERIALS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This photoreduction method does not require the use of two tanks like the chemical reduction method, and the length of the rod can be controlled according to the light irradiation time, but there is a problem that the reaction time is slow

Method used

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  • Metal microparticle, composition containing the same and process for producing metal microparticle
  • Metal microparticle, composition containing the same and process for producing metal microparticle
  • Metal microparticle, composition containing the same and process for producing metal microparticle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0110] Method for producing gold particles

[0111] To 50 ml of 0.50 mol / L CTAB aqueous solution, 5 ml of 24 mmol / L aqueous chloroauric acid solution, 1 ml of acetone, 1 ml of cyclohexane, 1 ml of cyclohexanone, and 5 ml of 10 mmol / L aqueous silver nitrate solution were added to prepare a reaction solution. To this reaction solution, 5 ml of a 40 mmol / L ascorbic acid (AS) aqueous solution was added to perform chemical reduction. The reaction solution changed from orange to a clear solution immediately after the AS aqueous solution was added. The transparent solution was put into a beaker with a capacity of 100 ml, and the synthesis solution was directly irradiated with ultraviolet rays from a UV irradiator (high pressure mercury lamp) from the upper part of the beaker for 5 minutes. After being irradiated with light, it was left as it was, and after 1 hour, it was transferred to a storage container, and the solution was diluted 10 times with water (volume ratio, gold particle...

Embodiment 2

[0114] Gold particles surface treated with dispersant

[0115] 0.1 g of a dispersant (manufactured by Avecia: Solsperse 24000SC) was dissolved in 10 g of toluene, and the gold nanorods synthesized in Example 1 (average length of short axis: 10 nm, average length of long axis: 42 nm, Aspect ratio 4.2) 50 g of the aqueous dispersion was stirred for 10 minutes with a mixer (rotational speed 300 rpm). To this solution, 30 g of ethanol was added, and the solution was left to stand for 24 hours. By adding ethanol, the solubility of CTAB becomes high, the CTAB adsorbed on the surface of the gold nanorods is desorbed, and the nitrogen site of the dispersant is adsorbed on the gold nanorods and replaced with CTAB, and the surface treatment is performed accordingly.

[0116] The standing mixture was separated into a colorless and transparent aqueous phase and a bright red toluene phase. Then, only the organic solvent layer was extracted, and the remaining toluene was removed using an ...

Embodiment 3

[0119] Gold particle composition and film

[0120] 5 g of the gold nanorod concentrate of Example 2 was mixed with 20 g of a mixture of a radically polymerizable urethane-based oligomer and a radical polymerization initiator to prepare a paint. The paint was kept at room temperature for 3 months or more in a light-shielded state without discoloration or precipitation, and was stable.

[0121] This coating material was applied on a glass plate (the content of gold fine particles was 1 wt %, and the dry film thickness was 10 μm), and the transmission spectrum was measured. image 3 shows this result. As shown in the figure, with figure 2 The peak position of the peak position of the absorption maximum wavelength is the lowest in the vicinity of the wavelength (870 nm), which confirms that the specific wavelength is absorbed by the gold nanorods.

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Abstract

The present invention provides metal fine particles which have selective wavelength absorption characteristics in a wavelength region from visible light to near infrared light, and have sharp absorption characteristics, and influences little the surrounding wavelength, and therefore, they yield tones having high chroma. The present invention provides metal fine particles wherein an aspect ratio is in a range from 1.1 to 8.0, a maximum absorption wavelength in plasmon absorption is in a range from 400 nm to 1,200 nm, and an absorption coefficient at a peak position of the maximum absorption wavelength is in a range from 6,000 to 20,000 L / mol.cm (measurement concentration: 1.6x10-4 mol / L, and solvent:water).

Description

technical field [0001] The present invention relates to metal microparticles, preferably gold microparticles, which have a selective light absorption function for any wavelength in the wavelength region from visible light to near-infrared light, and have high absorbance, narrow absorption spectrum width, and sharp light absorption characteristics. , In particular, nano-sized rod-shaped gold particles (hereinafter referred to as gold nanorods). [0002] In addition, the present invention relates to a method for producing metal fine particles, which can easily control the aspect ratio of the metal fine particles. [0003] Furthermore, the present invention relates to a composition and the like containing the above-mentioned metal fine particles or the metal fine particles obtained by the above-mentioned production method. [0004] This application claims priority to Japanese Patent Application No. 2003-314208 filed on September 5, 2003, Japanese Patent Application No. 2004-1162...

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00
Inventor 高田佳明平田宽树佐藤纯悦新留康郎山田淳西冈宏司川崎英也沟口大刚永井昌宪室内圣人石原真兴
Owner MITSUBISHI MATERIALS CORP
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