SYNTHESIS OF NANOPARTICLES COMPRISING OXIDATION SENSITIVE METALS WITH TUNED PARTICLE SIZE AND HIGH OXIDATION STABILITY

Title:

SYNTHESIS OF NANOPARTICLES COMPRISING OXIDATION SENSITIVE METALS WITH TUNED PARTICLE SIZE AND HIGH OXIDATION STABILITY

Document Type and Number:

WIPO Patent Application WO/2012/152740

Kind Code:

A3

Abstract:

Process for the synthesis of nanoparticles comprising oxidation sensitive metals, in particular copper comprising the following steps: Preparation and nucleation of citrate-capped Metal-hydroxide nanoparticles, reduction of the intermediate citrate-capped Metal-hydroxide nanoparticles to Metal0 by reduction via NaBH4 Cu0 nanoparticles with narrow size distribution are obtained by NaBH4 Li-induced reduction of CUCI2 2H2O in diethylene glycol. The course of the reaction essentially involves an intermediate formation of Cu(OH)2 nanoparticles as well as the presence of citrate to control the nucleation of almost monodisperse and non-agglomerated Cu0 nanoparticles. The citrate-capped Cu0 nanoparticles of the invention are surprisingly stable against air oxidation. Via simple solvent evaporation, porous Cu0 thin-films are prepared on glass substrates that exhibit bulk-like sheet resistances of 0.23 - 0.42 Ωϛ after vacuum sintering at 250 °C (bulk-Cu sheet under similar conditions with: 0.3 Ωϛ). With these features the as-prepared, citrate-capped Cu0 nanoparticles become highly relevant to electronic devices in particular thin-film electronics, thin-film sensors and high-power batteries.

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Inventors:

RAUSCHER FRANK (DE)
FELDMANN CLAUS (DE)
KIND CHRISTIAN (DE)
LU HUACHANG (DE)
KOEHLER KAREN (DE)
MLECZKO LESLAW (DE)

Application Number:

PCT/EP2012/058339

Publication Date:

January 10, 2013

Filing Date:

May 07, 2012

Export Citation:

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Assignee:

BAYER IP GMBH (DE)
RAUSCHER FRANK (DE)
FELDMANN CLAUS (DE)
KIND CHRISTIAN (DE)
LU HUACHANG (DE)
KOEHLER KAREN (DE)
MLECZKO LESLAW (DE)

International Classes:

B22F1/054; B22F9/24; H01L21/304; H01L31/0352

Foreign References:

US20070190323A1	2007-08-16
JP2010189681A	2010-09-02

Other References:

KYLER J. CARROLL ET AL: "Preparation of Elemental Cu and Ni Nanoparticles by the Polyol Method: An Experimental and Theoretical Approach", JOURNAL OF PHYSICAL CHEMISTRY C, vol. 115, no. 6, 17 February 2011 (2011-02-17), pages 2656 - 2664, XP055044673, ISSN: 1932-7447, DOI: 10.1021/jp1104196

Attorney, Agent or Firm:

BAYER INTELLECTUAL PROPERTY GMBH (Alfred-Nobel-Str. 10, Monheim, DE)

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