Nanoink composition

Abstract

Disclosed is a nanoink composition which can impart electrical conductivity to a surface-protecting ligand layer of an inorganic nanoparticle and does not require any post-treatment such as the removal of ligands. Specifically disclosed is a nanoink composition comprising inorganic nanoparticles ( 1 ) and an organic π-conjugated ligand ( 3 ), and characterized in that the organic π-conjugated ligand ( 3 ) is bound to the inorganic nanoparticles ( 1 ) via π-conjugation to exhibit electrical conductivity.

What is claimed is: 
     
         1 . A nanoink composition comprising:
 an inorganic nanoparticle comprising at least one metal, a mixture of at least two metals, or an alloy of at least two metals, wherein the at least one metal or the at least two metals are selected from a group consisting of gold, silver, copper, palladium, nickel, ruthenium, indium, and rhodium;   an organic pi conjugated ligand comprising: a phthalocyanine or naphthalocyanine derivative having one or more substituent groups substituting at only beta position of phthalocyanine or naphthalocyanine wherein one or more substituent side chains are any one or more substituent groups of mercapto group, phosphine group, halogen group, selenol group, sulfide group, and seleno ether group, and/or any one or more substituent groups of hydroxyl group, carboxyl group, amino group, alkylamino group, amido group, imide group, phosphonate group, sulfonate group, cyano group, nitro group, and salt thereof; and   a solvent,   characterized in that a Q band of the phthalocyanine or naphthalocyanine disappears.   
     
     
         2 . The nanoink composition according to  claim 1  wherein the solvent comprises water or a solvent mixed with water, or alcohol or a solvent mixed with alcohol. 
     
     
         3 . The nanoink composition according to  claim 1  wherein the organic pi conjugated ligand comprises OTAP. 
     
     
         4 . The nanoink composition according to  claim 2  wherein the organic pi conjugated ligand comprises OTAP. 
     
     
         5 . The nanoink composition according to  claim 1  wherein the organic pi conjugated ligand comprises OTAN. 
     
     
         6 . The nanoink composition according to  claim 2  wherein the organic pi conjugated ligand comprises OTAN. 
     
     
         7 . A nanoink composition comprising:
 an inorganic nanoparticle comprising at least one metal, a mixture of at least two metals, or an alloy of at least two metals, wherein the at least one metal or the at least two metals are selected from a group consisting of gold, silver, copper, palladium, nickel, ruthenium, indium, and rhodium;   an organic pi conjugated ligand comprising: a phthalocyanine or naphthalocyanine derivative having one or more substituent groups substituting at only one of two alpha positions of phthalocyanine or naphthalocyanine wherein one or more substituent side chains are any one or more substituent groups of mercapto group, phosphine group, halogen group, selenol group, sulfide group, and seleno ether group, and/or any one or more substituent groups of hydroxyl group, carboxyl group, amino group, alkylamino group, amido group, imide group, phosphonate group, sulfonate group, cyano group, nitro group, and salt thereof; and   a solvent,   characterized in that a Q band of the phthalocyanine or naphthalocyanine disappears.   
     
     
         8 . The nanoink composition according to  claim 7  wherein the solvent comprises water or a solvent mixed with water, or alcohol or a solvent mixed with alcohol. 
     
     
         9 . The nanoink composition according to  claim 7  wherein organic pi conjugated ligand comprises 1, 8, 15, 22-tetrakis[(2-N, N-dimethylaminoethyl) thio] phthalocyanine. 
     
     
         10 . The nanoink composition according to  claim 8  wherein organic pi conjugated ligand comprises 1, 8, 15, 22-tetrakis[(2-N, N-dimethylaminoethyl) thio] phthalocyanine.