# US 8,771,553 B2 · Conductive fine particle and metal paste for electrode formation, and electrode

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- Number: US 8,771,553 B2
- Document ID: US8771553B2
- Status: Granted
- Kind: B2
- Application number: 13/387,976
- Filed: 2011-07-08
- Published: 2012-05-24
- Granted: 2014-07-08
- Earliest claimed: 2010-07-12
- Assignees: Tanaka Kikinzoku Kogyo K.K.
- Applicants: Takuya Hosoi; Nobuhisa Okamoto; Koichi Sakairi
- Inventors: Takuya Hosoi; Nobuhisa Okamoto; Koichi Sakairi
- Web page: https://patentgrep.com/patent/US8771553B2

## CPC

- C09D 5/24: Electrically-conducting paints {(conductive materials H01B1/00)}
- G01N 27/4075: {Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts}
- H01B 1/02: mainly consisting of metals or alloys
- H01B 1/22: the conductive material comprising metals or alloys
- Y10T 428/2991: Coated
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An object of the present invention is to provide a conductive fine particle for producing a metal paste that can produce an electrode film having a low resistance, and a metal paste utilizing the conductive fine particle. The present invention is a conductive particle for electrode formation having a core/shell structure, and the conductive particle comprises a core particle made of Pt or a Pt alloy and having a particle diameter of 10 to 200 nm, and a shell made of a ceramic containing Al2O3 or ZrO2 and covers at least a part of the core particle, wherein the ceramic constituting the shell is added in an amount of 0.5 to 15% by weight based on the core particle to cover the core. The core particle is preferably Pt or a Pt alloy alloyed with Pd, Au, Ag, or Rh.

## Claims

### Claim 1

A sensor electrode obtained by calcining a metal paste comprising a conductive particle and a solvent, and the conductive particle has a core/shell structure, the conductive particle comprising:
a core particle that is made of Pt or a Pt alloy and having a particle diameter of 10 to 200 nm; and
a shell made of a ceramic comprising Al2O'or ZrO2 and covering at least a part of the core particle,
wherein the ceramic constituting the shell comprises an amount of 0.5 to 15% by weight based on the core particle to cover the core.

### Claim 2 (depends on 1)

The sensor electrode according to claim 1, wherein the core particle is Pt.

### Claim 3 (depends on 2)

The sensor electrode according to claim 2, wherein the amount of the conductive particle is 50 to 90% by weight based on the entire paste.

### Claim 4 (depends on 1)

The sensor electrode according to claim 1, wherein the core particle is a Pt-Pd alloy comprising 30% by weight or less of Pd.

### Claim 5 (depends on 4)

The sensor electrode according to claim 4, wherein the amount of the conductive particle is 50 to 90% by weight based on the entire paste.

### Claim 6 (depends on 1)

The sensor electrode according to claim 1, wherein the core particle is Pt or a Pt alloy further comprising 3% by weight or less of Al or Zr.

### Claim 7 (depends on 6)

The sensor electrode according to claim 6, wherein the core particle is Pt or a Pt alloy further comprising 3% by weight or less of Al.

### Claim 8 (depends on 7)

The sensor electrode according to claim 7, wherein the amount of the conductive particle is 50 to 90% by weight based on the entire paste.

### Claim 9 (depends on 6)

The sensor electrode according to claim 6, wherein the amount of the conductive particle is 50 to 90% by weight based on the entire paste.

### Claim 10 (depends on 1)

The sensor electrode according to claim 1, wherein the core particle is Pt or a Pt alloy further comprising 3% by weight or less of Al.

### Claim 11 (depends on 1)

The sensor electrode according to claim 1, wherein the amount of the conductive particle is 50 to 90% by weight based on the entire paste.

### Claim 12 (depends on 1)

The sensor electrode according to claim 1, wherein the amount of the conductive particle is 50 to 90% by weight based on the entire paste.