Synthesis of Metallic Nanoparticle Dispersions
First Claim
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1. A composition, comprising:
- a population of metallic nanoparticles dispersed in an aqueous medium, wherein at least a portion of the population comprising individual metallic nanoparticles characterized as having an average cross-sectional dimension in the range of from about 1 nm to about 100 nm; and
, wherein each of the nanoparticles comprise at least one ligand bound to its surface, the ligand comprising a heteroatom head group bound to the nanoparticle surface and a tail bound to the heteroatom head group.
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Abstract
Disclosed are compositions comprising metallic nanoparticles suitable for use in cohesive, highly conductive structures on substrates. Also disclosed are methods for synthesizing the compositions and methods for forming cohesive, highly conductive structures from the compositions.
93 Citations
105 Claims
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1. A composition, comprising:
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a population of metallic nanoparticles dispersed in an aqueous medium, wherein at least a portion of the population comprising individual metallic nanoparticles characterized as having an average cross-sectional dimension in the range of from about 1 nm to about 100 nm; and
,wherein each of the nanoparticles comprise at least one ligand bound to its surface, the ligand comprising a heteroatom head group bound to the nanoparticle surface and a tail bound to the heteroatom head group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A composition, comprising:
a metallic nanoparticle mixture comprising at least one metallic nanoparticles, capable of forming a cohesive structure of less than about 10 μ
m in thickness following curing at a temperature of less than about 140°
C. for less than about 90 seconds, wherein the cohesive structure has a resistivity in the range of from about 2 times to about 15 times the bulk resistivity of the corresponding metal.- View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A method for synthesizing a metallic nanoparticle dispersion, comprising:
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reacting in an aqueous medium;
at least one ligand, wherein the ligand comprises a heteroatom head group bonded to a tail comprising from 1 to about 20 carbon atoms;
at least one reducing agent; and
,at least one metallic salt in an aqueous dispersing solution, wherein the metallic salt is present in the dispersion at a concentration in the range of from about 10 grams/liter to about 600 grams/liter based on volume of the dispersing solution, and wherein the metallic salt comprises at least one cation comprising silver, copper, gold, zinc, cadmium, palladium, iridium, ruthenium, osmium, rhodium, platinum, iron, nickel, cobalt, indium, or any combination thereof. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56)
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57. A method for forming a conductive structure on a substrate, comprising:
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depositing a composition onto the substrate, wherein the composition comprises at least one population of metallic nanoparticles, wherein at least a portion of the population comprising individual metallic nanoparticles characterized as having an average cross-sectional dimension in the range of from about 1 nm to about 30 nm;
wherein each of the nanoparticles comprise at least one ligand bound to its surface, the ligand comprising a heteroatom head group bound to the nanoparticle surface and a tail bound to the heteroatom head group; and
,curing the deposited composition. - View Dependent Claims (58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80)
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81. A method for forming a conductive structure, comprising:
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depositing a metallic nanoparticle composition comprising at least one metallic nanoparticle onto the substrate, wherein the composition is capable of forming after curing at a temperature of less than about 140°
C. for less than about 90 seconds a cohesive and conductive structure having a resistivity in the range of from about 2 times to about 15 times the bulk resistivity of the corresponding metal and having a thickness of less than about 20 μ
m; and
,curing the deposited composition. - View Dependent Claims (82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105)
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Specification