Methods of controlling nanostructure formations and shapes
View Patent ↗A method of forming monodispersed metal nanowires comprising: forming a reaction mixture including a metal salt, a capping agent and a quaternary ammonium chloride in a reducing solvent at a first temperature; and forming metal nanowires by reducing the metal salt in the reaction mixture.
1. A composition comprising:
a metal salt;
a capping agent selected from poly(vinyl pyrrolidone), polyacrylamide, polyacrylic and copolymers thereof;
a quaternary ammonium chloride; and
a reducing solvent including at least two hydroxyl groups, wherein a molar ratio of the quaternary ammonium chloride and the metal salt is between about 0.001 and about 0.1.
2. The composition of claim 1 wherein the metal salt is silver nitrate, silver acetate, silver perchlorate, gold perchlorate, palladium chloride, or platinum chloride.
3. The composition of claim 1 wherein the quaternary ammonium chloride is represented by formula NR 4 + Cl − , each R being the same or different and independently an alkyl, alkenyl, alkynyl, aryl, or aralkyl.
4. The composition of claim 3 wherein each R is the same or different and independently methyl, butyl, octyl, decyl or cetyl.
5. The composition of claim 1 wherein the quaternary ammonium chloride is tetramethylammonium chloride, tetrabutylammonium chloride, cetyl trimethylammonium chloride, C 8 -C 18 alkyl dimethyl benzyl ammonium chloride, or methyl trioctylammonium chloride.
6. The composition of claim 1 wherein a molar ratio of the quaternary ammonium chloride and the metal salt is about 0.1.
7. The composition of claim 1 wherein the reducing solvent is ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, glycerin, glycerol, or glucose.
8. The composition of claim 1 wherein the capping agent is poly(vinyl pyrrolidone) having a molecular weight of 50,000.
9. The composition of claim 1 comprising silver nitrate, poly(vinyl pyrrolidone), tetrabutylammonium chloride and ethylene glycol.
10. The composition of claim 1 further comprising a plurality of metal nanowires.
11. A composition comprising:
a metal salt;
a capping agent selected from poly(vinyl pyrrolidone), polyacrylamide, polyacrylic and copolymers thereof;
a quaternary ammonium chloride;
a reducing solvent including at least two hydroxyl groups;
a plurality of metal nanowires; and wherein a molar ratio of the quaternary ammonium chloride and the metal salt is between about 0.001 and about 0.1.
12. The composition of claim 11 wherein the metal salt is silver nitrate, silver acetate, silver perchlorate, gold perchlorate, palladium chloride, or platinum chloride.
13. The composition of claim 11 wherein the quaternary ammonium chloride is represented by formula NR 4 + Cl − , each R being the same or different and independently an alkyl, alkenyl, alkynyl, aryl, or aralkyl.
14. The composition of claim 13 wherein each R is the same or different and independently methyl, butyl, octyl, decyl or cetyl.
15. The composition of claim 11 wherein the quaternary ammonium chloride is tetramethylammonium chloride, tetrabutylammonium chloride, cetyl trimethylammonium chloride, C 8 -C 18 alkyl dimethyl benzyl ammonium chloride, or methyl trioctylammonium chloride.
16. The composition of claim 11 wherein the reducing solvent is ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, glycerin, glycerol, or glucose.
17. The composition of claim 11 wherein the capping agent is poly(vinyl pyrrolidone) having a molecular weight of 50,000.
18. The composition of claim 11 comprising silver nitrate, poly(vinyl pyrrolidone), tetrabutylammonium chloride, ethylene glycol and silver nanowires.