Ultrafine metal oxide particle dispersion liquid and ultrafine metal oxide particle thin film

Inactive Publication Date: 2005-09-08
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0028] The present invention further provides an ultrafine metal oxide particle thin film produced with the above ultrafine meta

Problems solved by technology

This is probably because a gradual reaction does not allow the particles to take in excess water.
A coating liquid prepared by a conventional microemulsion method, however, undesirably requires the repetition of coating many times to form a thin film having a desired thickness because the concentration of the coating liquid is low and therefore the rate of deposition is low, namely 10 to 20 nm for each coating.
According to the first approach, the removal of the hydrophobic medium increases the proportion of the residual surfactant, thus undesirably increasing the viscosity of the dispersion liquid and producing porous films due to loss of the surfactant during firing.
In this approach, however, an i

Method used

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  • Ultrafine metal oxide particle dispersion liquid and ultrafine metal oxide particle thin film
  • Ultrafine metal oxide particle dispersion liquid and ultrafine metal oxide particle thin film
  • Ultrafine metal oxide particle dispersion liquid and ultrafine metal oxide particle thin film

Examples

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example 1

[0084] First, 4 g of barium isopropoxide was mixed into 160 ml of isopropyl alcohol in a glove box containing an argon atmosphere to prepare a barium alkoxide solution. An equimolar amount of titanium isopropoxide solution was added dropwise into the barium alkoxide solution, which was mixed overnight to obtain a light yellow, transparent barium-titanium composite alkoxide stock solution.

[0085] A W / O microemulsion was prepared by mixing water, cyclohexane, as a dispersion medium, NP-10 ((p—C9H19)—C6H4—O—(CH2CH2O)10CH2CH2OH), as a surfactant, and 1-octanol, as a cosurfactant, at a ratio of 0.2:150:7.5:9, respectively, while bubbling the mixture with an argon gas. The barium-titanium composite alkoxide stock solution was then added to the microemulsion with a micropipette so that the content of water in the microemulsion was 1.2 times the amount of water required for the hydrolysis of the barium-titanium composite alkoxide. This mixture was stirred in a glove box containing an argon ...

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Abstract

An ultrafine metal oxide particle dispersion liquid is prepared by mixing an ultrafine titanium-based composite metal oxide particle dispersion liquid prepared by hydrolysis in a microemulsion containing a hydrophobic dispersion medium, water, and a surfactant and an organic metal compound solution for the same titanium-based composite metal oxide at a ratio of 1:1 to 1:30 in terms of the composite metal oxide contained.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to ultrafine metal oxide particle dispersion liquids in which ultrafine metal oxide particles are dispersed and ultrafine metal oxide particle thin films composed of metal oxide nanoparticles and having excellent dielectric properties. [0003] 2. Description of the Related Art [0004] In recent years, higher-performance devices have been intensively researched and developed with the increasing need for the miniaturization of devices. For example, composite metal oxides such as barium titanate and lead titanate zirconate are widely used for devices such as monolithic capacitors and actuators since such materials have excellent dielectric and piezoelectric properties. Development of smaller, higher-performance devices demands the establishment of techniques for manufacturing thinner, higher-quality films composed of finer particles. [0005] One of such thin-film manufacturing techniques is t...

Claims

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Application Information

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IPC IPC(8): C01G23/00H01C1/00
CPCB82Y30/00C01G23/006H01G4/1227C01P2006/22C01P2004/64B01J13/0008B01J13/0039
Inventor YAMASHITA, YASUHISA
Owner MURATA MFG CO LTD
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