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Method of producing metallic nano particle colloidal dispersions

  • US 10,076,785 B2
  • Filed: 07/17/2017
  • Issued: 09/18/2018
  • Est. Priority Date: 07/18/2016
  • Status: Active Grant
First Claim
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1. A stable, fully reduced metallic nanoparticle-containing colloidal dispersion in which the nanoparticle is a reduced metal and aromatic stabilizer particle with a uniform and mean particle size less than 2.9 nm, wherein the nanoparticle comprises a metal and aromatic stabilizer with at least two nitrogen functional groups, and wherein the colloidal dispersion is synthesized by a solution phase synthesis process wherein synthesis occurs at a temperature of less than 60 degrees Celsius in a period of less than 60 minutes, comprising the steps of:

  • forming a salt charge transfer complex of metal cations (CT complex) of an amino alcohol or diamine moiety with a metal salt;

    reacting the CT complex with a solution comprising a two or three nitrogen atom-containing organic reducing agent to form metallic nanoparticles; and

    stabilizing the metallic nanoparticles with aniline or a bi-dentate hetero atom containing a Lewis Base amine stabilizer to form the stable, fully reduced metallic nanoparticle-containing colloidal dispersion,wherein;

    the CT complex results from the reaction of a metallic formate, acetate, alkoxide or citrate salt dissolved in at least two solvents selected from the group consisting of water, monoethanolamine, di-ethanolamine, tri-ethanolamine, 1,2-aminopropanol, 1,3-aminopropanol, and combinations thereof;

    the two or three nitrogen atom containing reducing agent is selected from the group consisting of diethylenetriamine, 1,2-diaminocyclohexane, hydrazine, organic group substituted hydrazine molecule or phenidone molecule; and

    the bi-dentate hetero atom-containing amine stabilizer is selected from the group consisting of dimethyl glyoxime, 2,2′

    -bipyridine, 1,10-phenanthroline, ortho-phenylenediamine, 1,2-diaminocyclohexane, 1,4-diamino butane, urea, 8-hydroxyquinoline, substituted urea, and combinations thereof.

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