Method for producing metal nanowires and silver nanowires

1. A metal nanowire production method comprising, a step for preparing a solution containing a metal salt, a polymer, at least one selected from a group consisting of halides, sulfides, carbonates, and sulfates, and an aliphatic alcohol, and a step for heating and reacting the solution at the temperature of 100° C. to 250° C. for 10 minutes or more while maintaining a simplified shear stress applied to the solution at 10 mPa·m or less, wherein, during the heating and reacting step, ultraviolet-visible absorption spectrum change of the solution is measured, and a reaction time is controlled on the basis of the ultraviolet-visible absorption spectrum information.

2. A metal nanowire production method according to claim 1 , wherein the metal is at least one selected from a group consisting of gold, silver, copper, platinum, palladium, ruthenium, cobalt, nickel, molybdenum, indium, iridium, and titanium.

3. A metal nanowire production method according to claim 1 , wherein the metal salt is at least one selected from a group consisting of a nitrate, an organic carboxylate, a metal alkoxide, and a metal phenoxide.

4. A metal nanowire production method according to claim 1 , wherein the polymer is at least one selected from a group consisting of polyvinylpyrrolidone, poly-N-vinyl acetamide, poly-N-vinyl formamide, polyvinyl caprolactam, and polyacrylamide.

5. A metal nanowire production method according to claim 1 , wherein the aliphatic alcohol has a boiling point of 100° C. or more at 1 atmospheric pressure, and a viscosity of 10 Pa·s or less at 25° C.

6. A metal nanowire production method according to claim 1 , wherein the halide is selected from a group consisting of NaCl, CoCl 2 , SnCl 4 , CuCl 2 , NiCl 2 , FeCl 3 , ZnCl 2 , NaBr, NaI, KBr, KI, and quaternary ammonium salts represented by R 4 NCl, R 4 NBr, R 4 NI (wherein, R is an alkyl group having 1 to 12 carbons), the sulfide is selected from a group consisting of Na 2 S and K 2 S, the carbonate is selected from a group consisting of Na 2 CO 3 and K 2 CO 3 , and the sulfate is selected from a group consisting of Na 2 SO 4 and K 2 SO 4 .

7. A metal nanowire production method according to claims 1 , wherein metal is silver, the aliphatic alcohol is at least one selected from a group consisting of ethylene glycol and propylene glycol, and the at least one selected from a group consisting of halides, sulfides, carbonates, and sulfates has a concentration of 1×10 −8 M to 1×10 −2 M.

8. A metal nanowire production method according to claim 7 , wherein, ultraviolet-visible absorption spectrum of the solution is measured during the heating step, and the reaction is stopped at a point where a ratio (A420 nm/A350 nm) representing an absorption intensity at 350 nm (A350) relative to an absorption intensity at 420 nm (A420) is 2 or less, and an absorption intensity at 380 nm (A380) is more than a half of the peak absorption intensity at 380 nm.

9. A silver nanowire production method comprising, a step for preparing a solution containing a silver salt, a polymer, at least one selected from a group consisting of halides, sulfides, carbonates, and sulfates, and an aliphatic alcohol, and a step for heating and reacting the solution at the temperature of 100° C. to 250° C. for 10 minutes or more while maintaining a simplified shear stress applied to the solution at 10 mPa·m or less, wherein, during the heating and reacting step, ultraviolet-visible absorption spectrum change of the solution is measured, and a reaction time is controlled on the basis of the ultraviolet-visible absorption spectrum information.

10. A silver nanowire production method according to claim 9 , wherein the silver salt is at least one selected from a group consisting of a nitrate, an organic carboxylate, a silver alkoxide, and a silver phenoxide.

11. A silver nanowire production method according to claim 9 , wherein the polymer is at least one selected from a group consisting of polyvinylpyrrolidone, poly-N-vinyl acetamide, poly-N-vinyl formamide, polyvinyl caprolactam, and polyacrylamide.

12. A silver nanowire production method according to claim 9 , wherein the aliphatic alcohol has a boiling point 100° C. or more at 1 atmospheric pressure, and a viscosity of 10 Pa·s or less at 25° C.

13. A silver nanowire production method according to claim 9 , wherein the halide is selected from a group consisting of NaCl, CoCl 2 , SnCl 4 , CuCl 2 , NiCl 2 , FeCl 3 , ZnCl 2 , NaBr, NaI, KBr, KI, and quaternary ammonium salts represented by R 4 NCl, R 4 NBr, R 4 NI (wherein, R is an alkyl group having 1 to 12 carbons), the sulfide is selected from a group consisting of Na 2 S and K 2 S, the carbonate is selected from a group consisting of Na 2 CO 3 and K 2 CO 3 , and the sulfate is selected from a group consisting of Na 2 SO 4 and K 2 SO 4 .

14. A silver nanowire production method according to claim 9 , wherein the aliphatic alcohol is at least one selected from a group consisting of ethylene glycol and propylene glycol, and the at least one selected from a group consisting of halides, sulfides, carbonates, and sulfates has a concentration of 1×10 −8 M to 1×10 −2 M.

15. A silver nanowire production method according to claim 14 , wherein, ultraviolet-visible absorption spectrum of the solution is measured during the heating step, and the reaction is stopped at a point where a ratio (A420 nm/A350 nm) representing an absorption intensity at 350 nm (A350) relative to an absorption intensity at 420 nm (A420) is 2 or less, and an absorption intensity at 380 nm (A380) is more than a half of the peak absorption intensity at 380 nm.