Methods for fabricating metal nanowires
First Claim
1. A method for preparing metallic nanometer scale wires comprising the steps ofelectrodepositing a plurality of wires from an aqueous solution including a metal at step edges present on a stepped surface, embedding the plurality of wires in a polymer film, and lifting the plurality of wires off of the stepped surface.
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Accused Products
Abstract
Methods for the preparation of long, dimensionally uniform, metallic nanowires that are removable from the surface on which they are synthesized. The methods include the selective electrodeposition of metal nanowires at step edges present on a stepped surface, such as graphite, from an aqueous solution containing a metal or metal oxide. Where a metal oxide is first deposited, the metal oxide nanowires are reduced via a gas phase reduction at elevated temperatures to metal nanowires. Alternatively, beaded or hybrid nanowires comprising a metal A into which nanoparticles of a metal B have been inserted may be prepared by first electrodepositing nanoparticles of metal B selectively along step edges of a stepped surface, capping these nanoparticles with a molecular layer of an organic ligand, selectivley electrodepositing nanowire segments of metal A between nanoparticles of metal B and then heating the surface of the hybrid nanowire under reducing conditions to remove the ligand layer. In all three methods, the nanowires may be removed from the stepped surface by embedding the wires in a polymer film, and then peeling this film containing the embedded wires off of the stepped surface.
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Citations
19 Claims
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1. A method for preparing metallic nanometer scale wires comprising the steps of
electrodepositing a plurality of wires from an aqueous solution including a metal at step edges present on a stepped surface, embedding the plurality of wires in a polymer film, and lifting the plurality of wires off of the stepped surface.
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5. A method for preparing metallic nanowires comprising the steps of
electrodepositing metal oxide particles at step edges present on a stepped surface from an aqueous solution including a metal oxide forming a plurality of metal oxide wires, reducing the plurality of metal oxide wires via gas phase reduction to a plurality of metal wires, embedding the plurality of metal wires in a polymer film, and lifting the plurality of metal wires from the stepped surface.
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10. A method for preparing beaded nanowires comprising the steps of
electrodepositing nanoparticles of a first metal from a first aqueous solution at step edges present on a stepped surface, and electrodepositing wire segments of a second metal from a second aqueous solution at the stepped edges between the nanoparticles forming a plurality of beaded nanowires.
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16. A method for preparing nanometer scale metallic wires comprising the steps of
applying a deposition potential to an aqueous solution comprising a metal or metal oxide wherein the deposition potential corresponds to an over potential of less than − - 900 millivolts, and
selectively depositing metal or metal oxide nanowires at step edges present on a stepped surface. - View Dependent Claims (17, 18, 19)
- 900 millivolts, and
Specification