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US 2009/0196788 A1Published application
Methods For The Production Of Silver Nanowires
AssigneeSeashell Technology, LLC
InventorsYuliang Wang, Janet Cravens Dickerson
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Abstract
Embodiments of the present invention are directed to novel methods for the solution-based production of silver nanowires by adaptation of the polyol process. Some embodiments of the present invention can be practiced at lower temperature and/or at higher concentration than previously described methods. In some embodiments reactants are added in solid form rather than in solution. In some embodiments, an acid compound is added to the reaction.
Claims20
A method for the production of silver nanowires comprising reacting:
- i) at least one polyol;
- ii) at least one silver compound capable of producing silver metal when reduced;
- iii) at least one organic protective agent (OPA);
- iv) optionally at least one compound comprising halide ion;
- and
- v) optionally at least one compound comprising Fe(II) and/or Fe(III);
- as reactants in a reaction at a reaction temperature and under conditions that produce a product solution comprising at least 10 weight percent (10 wgt %) silver nanowires as compared with a weight percent of all other silver nanostructures in the product solution;
- a) wherein the reaction temperature is less than or equal to 145° C.;
- and/or wherein a ratio of total moles of silver (either as an ion or as metal) to a total volume of polyol or polyols (in liters) in the product solution is greater than or equal to 0.1 molar;
- and
- b) wherein a ratio of a molar concentration of the organic protective agent to a molar concentration of the silver (either as an ion or as metal) in the product solution is less than or equal to 10:1.
8 more elements
A method for the production of silver nanowires comprising:
- i) mixing as reactants for a reaction:
- a) at least one silver compound capable of producing silver metal when reduced;
- b) at least one polyol;
- c) at least one organic protective agent;
- and d) optionally at least one compound comprising halide ion and/or at least one compound comprising Fe(II) and/or Fe(III) to thereby produce a mixture;
- and
- ii) reacting the mixture at a reaction temperature and under conditions that produce a product solution comprising at least 10 weight percent (10 wgt %) silver nanowires as compared with a weight percent of all other silver nanostructures in the product solution;
- a) wherein the reaction temperature is less than or equal to 145° C.;
- and/or wherein a ratio of total moles of silver (either as an ion or as metal) to a total volume of polyol or polyols (in liters) in the product solution is greater than or equal to 0.1 molar;
- and
- b) wherein a ratio of a molar concentration of the organic protective agent to a molar concentration of the silver (either as an ion or as metal) in the product solution is less than or equal to 10:1.
8 more elements
A method for the production of silver nanowires comprising reacting:
- i) at least one polyol;
- ii) at least one silver compound capable of producing silver metal when reduced;
- iii) at least one organic protective agent (OPA);
- iv) at least one acid compound;
- v) optionally at least one compound comprising halide ion;
- and
- vi) optionally at least one compound comprising Fe(II) and/or Fe(III);
- at a reaction temperature and under conditions that produce silver nanowires having an aspect ratio of at least 150.
5 more elements
A method for the production of silver nanowires comprising reacting as reactants in a reaction a mixture of:
- i) at least one polyol;
- ii) at least one silver compound capable of producing silver metal when reduced;
- iii) at least one organic protective agent (OPA);
- iv) optionally at least one compound comprising halide ion;
- and
- v) optionally at least one compound comprising Fe(II) and/or Fe(III);
- at a reaction temperature and under conditions that produce silver nanowires, wherein the silver compound is in solid form when mixed with other reactants rather than mixed as a silver solution.
4 more elements
A method for the production of silver nanowires comprising reacting:
- i) at least one polyol;
- ii) at least one silver compound capable of producing silver metal when reduced;
- iii) at least one organic protective agent (OPA);
- iv) optionally at least one compound comprising halide ion;
- and
- v) optionally at least one compound comprising Fe(II) and/or Fe(III);
- as reactants in a reaction at a reaction temperature and under conditions that produce a product solution comprising at least 10 weight percent (10 wgt %) silver nanowires as compared with a weight percent of all other silver nanostructures in the product solution wherein the reaction produces bulk silver nanowire product having a length weighted average of at least 10 μm.
4 more elements
A method for the production of silver nanowires comprising reacting:
- i) at least one polyol;
- ii) at least one silver compound capable of producing silver metal when reduced;
- iii) at least one organic protective agent (OPA);
- iv) optionally at least one compound comprising halide ion;
- and
- v) optionally at least one compound comprising Fe(II) and/or Fe(III);
- as reactants in a reaction at a reaction temperature and under conditions that produce a product solution comprising at least 10 weight percent (10 wgt %) silver nanowires as compared with a weight percent of all other silver nanostructures in the product solution wherein the reaction produces bulk silver nanowire product having an AR weighted average that is at least 125.
4 more elements
Dependencies are inferred from the claim text.