Cobalt-tungsten alloy and method of fabricating the same
AssigneeKorea University Research and Business Foundation
InventorsYoung Keun Kim, Eun Min Yoo, Jun Hwan Moon, Yoo Sang Jeon
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Abstract
Disclosed are a cobalt-tungsten alloy and a method of fabricating the same. More particularly, cobalt-tungsten alloy nanowires according to an embodiment are formed using an electroplating method, a grain structure of the cobalt-tungsten alloy nanowires is controlled according to the content of tungsten, and the electrical resistivity of the cobalt-tungsten alloy nanowires can be reduced through annealing.
Claims10
A method of fabricating cobalt-tungsten alloy nanowires, the method comprising:
- forming cobalt-tungsten (Co—W) alloy nanowires on a nanotemplate using an electroplating method;
- and
- annealing the formed alloy nanowires,
- wherein, in the forming, a grain structure of the alloy nanowires is controlled according to a content of tungsten,
- wherein a content of tungsten in the cobalt-tungsten alloy nanowires is 25.1 at. % to control the grain structure of the alloy nanowires to have an amorphous-like structure,
- wherein, in the forming, the cobalt-tungsten alloy nanowires are formed using the electroplating method in an environment, in which a current density of 5.00 mA/cm2 is applied to simultaneously reduce cobalt and the tungsten,
- wherein the content of tungsten is controlled by using a deionized water-based solution comprising cobalt sulfate heptahydrate (CoSO4·7H2O), sodium tungstate heptahydrate (Na2WO4·7H2O), boric acid (H3BO3), citric acid (C6H8O7), and sodium citrate tribasic dihydrate (C6H7Na3O8), and
- wherein concentrations of the sodium tungstate heptahydrate (Na2WO4·7H2O) and the sodium citrate tribasic dihydrate (C6H7Na3O8) are 0.20 mol/L and 0.50 mol/L, respectively.
A method of fabricating cobalt-tungsten alloy nanowires, the method comprising:
- forming cobalt-tungsten (Co—W) alloy nanowires on a nanotemplate using an electroplating method;
- and
- annealing the formed alloy nanowires,
- wherein, in the forming, a grain structure of the alloy nanowires is controlled according to a content of tungsten,
- wherein a content of tungsten in the cobalt-tungsten alloy nanowires is 15.8 at. % to 19.1 at. % to control the grain structure of the alloy nanowires to have an amorphous-like structure,
- wherein, in the forming, the cobalt-tungsten alloy nanowires are formed using the electroplating method in an environment, in which a current density of 1.25 mA/cm2 to 5.00 mA/cm2 is applied to simultaneously reduce cobalt and the tungsten,
- wherein the content of tungsten is controlled by using a deionized water-based solution comprising cobalt sulfate heptahydrate (CoSO4·7H2O), sodium tungstate heptahydrate (Na2WO4·7H2O), boric acid (H3BO3), citric acid (C6H8O7), and sodium citrate tribasic dihydrate (C6H7Na3O8), and
- wherein concentrations of the sodium tungstate heptahydrate (Na2WO4·7H2O) and the sodium citrate tribasic dihydrate (C6H7Na3O8) are 0.10 mol/L to 0.20 mol/L and 0.50 mol/L, respectively.
Dependencies are inferred from the claim text.