Metal nano particle and method for manufacturing them and conductive ink

Abstract

A method of producing hydrophobic metal nanoparticles using a hydrophobic solvent, having uniform particle size distribution and high yield rate to allow mass production; the metal nanoparticles thus produced; and conductive ink including the metal nanoparticles are disclosed. According to one aspect of the invention, a method of producing metal nanoparticles is provided, comprising dissociating a metal compound with an amine-based compound, and adding a hydrocarbon-based compound and either one of an alkanoic acid or a thiol-based compound to the dissociated metal ion solution.

1 . A method of producing metal nanoparticles, said method comprising: 
 dissociating a metal compound with an amine-based compound; and    adding a hydrocarbon-based compound and either one of an alkanoic acid or a thiol-based compound to the dissociated metal ion solution.    
   
   
       2 . The method of  claim 1 , wherein the metal compound includes one or more metals selected from a group consisting of silver (Ag), copper (Cu), nickel (Ni), gold (Au), platinum (Pt), palladium (Pd), and iron (Fe).  
   
   
       3 . The method of  claim 2 , wherein the metal compound includes one or more compounds selected from a group consisting of AgNO 3 , AgBF 4 , AgPF 6 , Ag 2 O, CH 3 COOAg, AgCF 3 SO 3 , and AgClO 4 .  
   
   
       4 . The method of  claim 1 , wherein the amine-based compound has a composition of C x H 2x+1 NH 2 , where x is an integer from 2 to 20.  
   
   
       5 . The method of  claim 4 , wherein the amine-based compound is one or more compounds selected from a group consisting of butylamine, propylamine, octylamine, decylamine, dodecylamine, hexadecylamine, and oleylamine.  
   
   
       6 . The method of  claim 1 , wherein the mole ratio of the amine-based compound to the metal compound ranges from 1 to 100.  
   
   
       7 . The method of  claim 1 , wherein the hydrocarbon-based compound is one or more compounds selected from a group consisting of hexane, octane, decane, tetradecane, hexadecane, 1-hexadecene, 1-octadecene, toluene, xylene, and chlorobenzoic acid.  
   
   
       8 . The method of  claim 1 , wherein the hydrocarbon-based compound is added so that the concentration of the metal compound becomes a mole ratio of 0.001 to 10.  
   
   
       9 . The method of  claim 1 , wherein the alkanoic acid has a composition of RCOOH, where R is a saturated or unsaturated aliphatic hydrocarbon from C 1  to C 20 .  
   
   
       10 . The method of  claim 9 , wherein the alkanoic acid is one or more acids selected from a group consisting of lauric acid, oleic acid, decanoic acid, and palmitic acid.  
   
   
       11 . The method of  claim 1 , wherein the mole ratio of the alkanoic acid to the metal compound ranges from 0.1 to 1.  
   
   
       12 . The method of  claim 1 , wherein the thiol-based compound has a composition of C y H 2y+1 SH, where y is an integer from 2 to 20.  
   
   
       13 . The method of  claim 12 , wherein the thiol-based compound is one or compounds selected from a group consisting of linear-structure octanethiol, decanethiol, dodecanethiol, tetradecanethiol, hexadecanethiol, octadecanethiol and branched-structure 2-methyl-2-propanethiol.  
   
   
       14 . The method of  claim 1 , wherein the mole ratio of the thiol-based compound to the metal compound ranges from 0.1 to 1.  
   
   
       15 . The method of  claim 1 , wherein a reducing agent is further added during the adding of a hydrocarbon-based compound and either one of an alkanoic acid or a thiol-based compound to the dissociated metal ion solution.  
   
   
       16 . The method of  claim 15 , wherein the reducing agent is one or more compounds selected from a group consisting of boron hydroxide, hydrazine, alcohol, amide, acid, and glucose.  
   
   
       17 . The method of  claim 15 , wherein the reducing agent is one or more compounds selected from a group consisting of NaBH 4 , LiBH 4 , tetrabutylammonium borohydride, N 2 H 4 , glycol, glycerol, dimethylformamide, tannic acid, citrate, and glucose.  
   
   
       18 . The method of  claim 15 , wherein the mole ratio of the reducing agent to the metal compound ranges from 0.1 to 1.  
   
   
       19 . Metal nanoparticles, produced by a method comprising: 
 dissociating a metal compound with an amine-based compound; and    adding a hydrocarbon-based compound and an alkanoic acid to the dissociated metal ion solution.    
   
   
       20 . The metal nanoparticles of  claim 19 , wherein the size of the metal nanoparticles is 1 to 40 nm.  
   
   
       21 . The metal nanoparticles of  claim 19 , including 10 to 40 weight % organic components among the metal nanoparticles.  
   
   
       22 . The metal nanoparticles of  claim 19 , used an antibiotic, a deodorant, a disinfectant, a conductive adhesive, a conductive ink, or an electromagnetic shield for a display device.  
   
   
       23 . Metal nanoparticles, produced by a method comprising: 
 dissociating a metal compound with an amine-based compound; and    adding a hydrocarbon-based compound and a thiol-based compound to the dissociated metal ion solution.    
   
   
       24 . The metal nanoparticles of  claim 23 , wherein the size of the metal nanoparticles is 1 to 20 nm.  
   
   
       25 . The metal nanoparticles of  claim 23 , having 1 to 6 weight % of sulfur.  
   
   
       26 . The metal nanoparticles of  claim 23 , used an antibiotic, a deodorant, a disinfectant, conductive adhesive, conductive ink, or an electromagnetic shield for a display device.  
   
   
       27 . Conductive ink including metal nanoparticles produced by a method comprising: 
 dissociating a metal compound with an amine-based compound; and    adding a hydrocarbon-based compound and either one of an alkanoic acid or a thiol-based compound to the dissociated metal ion solution.