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Metal nanoparticle compositions

a technology of metal nanoparticles and compositions, applied in the direction of chemical vapor deposition coating, non-conductive materials with dispersed conductive materials, inks, etc., can solve the problems of insufficient approaches to produce well-defined features with good electrical properties, low viscosity compositions are not as well developed as high-viscosity compositions, etc., to achieve good electrical and/or mechanical properties, and low processing (curing).

Inactive Publication Date: 2006-08-24
CABOT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] The present invention is directed to metal nanoparticle compositions that can be deposited onto a substrate using, for example, direct-write methods such as ink-jet deposition. The metal nanoparticle compositions preferably exhibit a low processing (curing) temperature, thereby permitting the formation of electrically conductive features on a variety of substrates, including organic substrates. The metal nanoparticle compositions can be deposited onto a substrate and processed by heating and / or irradiation to form features with good electrical and / or mechanical properties.

Problems solved by technology

However, low viscosity compositions are not as well developed as the high viscosity compositions.
Ink-jet printing of conductors has been explored, but the approaches to date have been inadequate for producing well-defined features with good electrical properties, particularly at relatively low temperatures.

Method used

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  • Metal nanoparticle compositions
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Examples

Experimental program
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Effect test

example 1

Preparation of Silver Nanoparticles Carrying PVP Thereon

[0286] In a mixing tank a solution of 1000 g of PVP (M.W. 10,000, Aldrich) in 2.5 L of ethylene glycol is prepared and heated to 120° C. In a second mixing tank, 125 g of silver nitrate is dissolved in 500 ml of ethylene glycol at 25° C. These two solutions are rapidly combined (within about 5 seconds) in a reactor, in which the combined solutions (immediately after combination at a temperature of about 114° C.) are stirred at 120° C. for about 1 hour. The resultant reaction mixture is allowed to cool to room temperature and about 0.25 L of ethylene glycol is added thereto to replace evaporated ethylene glycol. This mixture is stirred at high speed for about 30 minutes to resuspend any particles that have settled during the reaction. The resultant mixture is transferred to a mixing tank where 12 L of acetone and about 1 L of ethylene glycol are added. The resultant mixture is stirred thoroughly and then transferred to a centri...

example 2

Effect of PVP Molecular Weight on Resistivity and Curing Temperature

[0295] Silver nanoparticles can be synthesized using 58,000 g / mol PVP using a process substantially the same as the process used to synthesize silver nanoparticles using 10,000 g / mol PVP by mixing a PVP / ethylene glycol solution with a silver nitrate / ethylene glycol solution. Once the reaction is complete, 250 mL of ethylene glycol is mixed into the reaction solution after cooling down. The resulting solution is equally divided into five 4-L Nalgene® bottles. 200 mL of ethylene glycol and 3 L of acetone are added to each plastic bottle. The bottles are sealed with lids and shaken up to create a black precipitate suspension in the solvent mixture. The suspensions are transferred to centrifuge bottles and centrifuged at 2,200 RPM for 10 minutes. The clear, light orange supernatants are discarded to leave behind a reflective, silver cake. More black suspension is added to the same bottles and the separation steps are r...

example 3

Preparation and Testing of Composition for Ink-Jet Printing

[0299] Silver nanoparticles prepared according to the process described in Example 1 (ranging from about 30 nm to about 50 nm in size) are suspended in a solvent mixture composed of, in weight percent based on the total weight of the solvent mixture, 40% of ethylene glycol, 35% of ethanol and 25% of glycerol to produce an ink for ink-jet printing. The concentration of the silver particles in the ink is 20% by weight.

[0300] The ink had the following properties:

Viscosity* (22° C.)14.4cPSurface tension** (25° C.)31dynes / cmDensity1.24g / cc

*measured at 100 rpm with a Brookfield DVII+ viscometer (spindle no. 18)

**measured with a KSV Sigma 703 digital tensiometer with a standard Du Nouy ring method

[0301] The ink is chemically stable for 6 months, some sedimentation occurring after 7 days at room temperature.

[0302] Printing and Properties of Printed Features

[0303] A Spectra SE 128 head (a commercial piezo ink-jet head) is loa...

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Abstract

A metal nanoparticle composition for the fabrication of conductive features. The metal nanoparticle composition advantageously has a low viscosity permitting deposition of the composition by direct-write tools. The metal nanoparticle composition advantageously also has a low conversion temperature, permitting its deposition and conversion to an electrical feature on polymeric substrates.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application Serial Nos. 60 / 643,577; 60 / 643,629; and 60 / 643,378, all filed on Jan. 14, 2005, the entireties of which are all incorporated herein by reference.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to metal nanoparticle compositions that are useful for the production of electrically conductive features. The compositions may advantageously be deposited on a variety of substrates and processed into electrically conductive features at low temperatures. The compositions can also have a viscosity which allows the deposition of the compositions using direct-write tools, such as ink-jet devices. [0004] 2. Discussion of Background Information [0005] The electronics, display and energy industries rely on the formation of coatings and patterns of conductive materials to form circuits on organic and inorganic substrates. The primary met...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09D5/10H01L21/44B22F1/054B22F1/0545
CPCB22F1/0018B22F1/0022B22F9/24B22F2998/10B82Y30/00C09D11/101C09D11/30C09D11/38C22B3/20C22B11/04C22B23/0453H01B1/22H01L21/288H05K1/097H05K3/125H05K2203/013Y10S977/896Y10S977/777Y02P10/20B22F1/0545B22F1/054
Inventor VANHEUSDEN, KARELKUNZE, KLAUSKIM, HYUNGRAKSTUMP, AARON D.SCHULT, ALLEN B.HAMPDEN-SMITH, MARK J.EDWARDS, CHUCKJAMES, ANTHONY R.CARUSO, JAMESKODAS, TOIVO T.HAUBRICH, SCOTT THOMASKOWALSKI, MARK H.
Owner CABOT CORP
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