A metallic nanoparticle dispersion
AssigneeAgfa-Gevaert
InventorsDirk BOLLEN, Nicolas VRIAMONT, Johan LOCCUFIER
Life of this patent
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Abstract
A metallic nanoparticle dispersion includes metallic nanoparticles and less than 50 μmol/g metal of an inorganic acid or a compound capable of generating such an acid during curing of a metallic layer or pattern formed from the dispersion. The presence of such small amounts an inorganic acid increases the conductivity of metallic layers or patterns formed from the metallic nanoparticle dispersions at moderate curing conditions.
Claims18
1-15. (canceled)
A metallic nanoparticle dispersion comprising:
- metallic nanoparticles;
- and
- less than 50 μmol/g metal of an inorganic acid or a compound that generates the inorganic acid during curing of the metallic nanoparticle dispersion.
A method of preparing a metallic nanoparticle dispersion, the method comprising the steps of:
- dispersing metal precursor particles in a dispersion medium including a solvent according to Formula I:
- wherein R1 and R2 represent an optionally substituted alkyl group;
- and
- R1 and R2 optionally form a ring;
- reducing the metal precursor particles with a reducing agent to form metallic nanoparticles;
- and
- adding an inorganic acid or a compound that generates the inorganic acid during or at an end of the method.
A method of preparing a metallic nanoparticle dispersion, the method comprising the steps of:
- forming a metal precursor dispersion or solution by adding a metallic precursor to a dispersion medium including:
- (a) a solvent according to Formula I:
- wherein
- R1 and R2 represent an optionally substituted alkyl group;
- and
- R1 and R2 optionally form a ring;
- and
- (b) a carboxylic acid according to Formula III:
- R—COOH Formula III
- wherein
- R is an optionally substituted C2-C7 alkyl, alkenyl, alkynyl, or cycloalkyl group;
- reducing the metallic precursor with a reducing agent to form metallic nanoparticles;
- sedimenting the metallic nanoparticles to obtain a concentrated metallic nanoparticle dispersion including at least 15 wt % of metallic nanoparticles;
- and
- adding an inorganic acid or a compound that generates the inorganic acid during or at an end of the method.
Dependencies are inferred from the claim text.