Method for manufacturing silver nanowire

1. A method for manufacturing silver nanowires, comprising reacting a reaction liquid including a growth control agent, a halide salt, a polyol, a silver salt, and an α-hydroxycarbonyl compound (a) represented by formula (1) below, to obtain the silver nanowires:

(in general formula (1), R indicates any of a hydrogen atom and a hydrocarbon group having 1 to 6 carbon atoms),

wherein the reaction liquid includes the growth control agent, the halide salt, the polyol, the silver salt and either one of hydroxyacetone or α-hydroxyacetophenone, and

the silver salt excludes a silver complex.

2. The method for manufacturing silver nanowires according to claim 1 , wherein the silver salt is silver nitrate.

3. The method for manufacturing silver nanowires according to claim 1 , wherein a molar ratio of the α-hydroxycarbonyl compound (a) to silver atoms in the silver salt is 0.20 to 3.0.

4. The method for manufacturing silver nanowires according to claim 1 , comprising a step of mixing a first solution containing the α-hydroxycarbonyl compound (a) and a second solution containing the silver salt at a reaction temperature over 10 minutes or more.

5. The method for manufacturing silver nanowires according to claim 1 , wherein a concentration of the growth control agent to the reaction liquid is 0.40% by mass or more.

6. The method for manufacturing silver nanowires according to claim 1 , wherein a molar ratio of halogen atoms in the halide salt to silver atoms in the silver salt is 0.010 to 0.30.

7. The method for manufacturing silver nanowires according to claim 1 , wherein the reacting the reaction liquid comprises heating the reaction liquid at 50° C. to 200° C. for 72 hours or less.

8. The method for manufacturing silver nanowires according to claim 1 , wherein the reacting the reaction liquid comprises heating the reaction liquid at 130° C. to 160° C. for 0.38 hours to 3 hours.

9. The method for manufacturing silver nanowires according to claim 1 , wherein the halide salt includes a chloride salt and a bromide salt.

10. The method for manufacturing silver nanowires according to claim 9 , wherein the chloride salt includes at least one of a sodium chloride or a lithium chloride, and the bromide salt includes at least one of a sodium bromide or a potassium bromide.

11. The method for manufacturing silver nanowires according to claim 1 , wherein a major axis length of each of the silver nanowires is 5 to 50 μm, and a diameter of each of the silver nanowires is less than 40 nm.

12. The method for manufacturing silver nanowires according to claim 1 , wherein the polyol is at least one selected from a group consisting of ethylene glycol, propylene glycol, 1,3-propanediol and glycerin.

13. The method for manufacturing silver nanowires according to claim 1 , wherein the growth control agent is polyvinyl pyrrolidone or poly-N-substituted (meth)acrylamide.

14. The method for manufacturing silver nanowires according to claim 1 , wherein a weight average molecular weight of the growth control agent is 100,000 to 2,000,000.

15. The method for manufacturing silver nanowires according to claim 1 , wherein the halide salt includes a chloride salt and a bromide salt, and [total number of moles of chlorine atoms in chloride]/[total number of moles of bromine atoms in bromide] is 1.5 to 5.0.

16. The method for manufacturing silver nanowires according to claim 1 , wherein a molar ratio of the α-hydroxycarbonyl compound (a) to silver atoms in the silver salt is 0.010 to 5.0.

17. The method for manufacturing silver nanowires according to claim 1 , wherein a molar ratio of hydroxyacetone or α-hydroxyacetophenone to silver atoms in the silver salt is 0.15 to 3.5.