Methods of positioning and/or orienting nanostructures
First Claim
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1. A method of depositing a population of nanowires on a surface substantially in a desired orientation, comprising:
- flowing a first fluid containing nanowires over the surface in a first direction, the first direction being parallel to a desired longitudinal orientation of the nanowires; and
permitting a population of nanowires in the first fluid to become immobilized onto the surface, a longitudinal dimension of the nanowires from the first fluid being substantially oriented in the first direction.
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Abstract
Methods of positioning and orienting nanostructures, and particularly nanowires, on surfaces for subsequent use or integration. The methods utilize mask based processes alone or in combination with flow based alignment of the nanostructures to provide oriented and positioned nanostructures on surfaces. Also provided are populations of positioned and/or oriented nanostructures, devices that include populations of positioned and/or oriented nanostructures, systems for positioning and/or orienting nanostructures, and related devices, systems and methods.
223 Citations
64 Claims
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1. A method of depositing a population of nanowires on a surface substantially in a desired orientation, comprising:
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flowing a first fluid containing nanowires over the surface in a first direction, the first direction being parallel to a desired longitudinal orientation of the nanowires; and
permitting a population of nanowires in the first fluid to become immobilized onto the surface, a longitudinal dimension of the nanowires from the first fluid being substantially oriented in the first direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method of positioning nanowires in one or more predetermined regions on a substrate, comprising:
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providing a substrate having a first surface;
overlaying the first surface with a mask, the mask providing fluid access to one or more first predetermined regions on the first surface, but not to one or more second predetermined regions on the surface of the substrate;
flowing fluid containing nanowires through the mask and into contact with the first predetermined regions of the substrate surface; and
permitting the nanowires contained in the nanowire containing fluid to immobilize in the first predetermined regions of the surface of the substrate. - View Dependent Claims (31, 32, 33, 34, 35)
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- 36. A population of nanowires immobilized on a planar surface of a substrate, the population of nanowires being substantially longitudinally oriented in a first direction parallel to the planar surface.
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40. A population of nanowires immobilized on a surface of a substrate, comprising:
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a first set of nanowires immobilized in a first selected region of the surface of the substrate; and
a second set of nanowires immobilized in a second selected region of the surface of the substrate, the second selected region being separate from the first selected region.
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41. A nanowire based device, comprising:
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at least a first population of nanowires immobilized in at least a first region of a surface of a substrate, the first population of nanowires being substantially longitudinally oriented in a first direction;
at least first and second electrical contacts disposed on the first region of the surface of the substrate; and
wherein the first and second electrical contacts are separated from each other on the first surface of the substrate in the first direction by a less than an average length of the nanowires in the first population of nanowires. - View Dependent Claims (42, 43, 44, 45, 46, 47, 48, 49, 50)
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51. A substrate comprising
a plurality of populations of nanowires deposited upon a first surface of said substrate; - and
wherein each of the populations of nanowires is deposited and immobilized in a separate discrete region of the surface of the substrate. - View Dependent Claims (52)
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53. A system for orienting nanowires on a surface of a substrate, comprising:
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a substrate having a first surface;
a fluid channel disposed on the first surface; and
a fluid direction system coupled to the first channel and coupled to a source of fluid containing nanowires, for flowing the fluid containing nanowires in a first direction through the first fluid channel. - View Dependent Claims (54, 55, 56)
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57. A system for positioning nanowires on a substrate, comprising:
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a substrate having a first surface;
a masking element disposed over the first surface and providing one or more fluid passages to one or more discrete regions of the first surface;
a source of fluid containing nanowires fluidly coupled to the one or more fluid passages on the masking element; and
a fluid direction system for delivering fluid from the fluid source to the one or more fluid passages. - View Dependent Claims (58, 59, 60, 61, 62, 63)
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64. A method of positioning nanostructures on a surface of a substrate, comprising:
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contacting the surface of the substrate with a fluid containing the nanostructures;
establishing a standing wave through the fluid, the standing wave localizing nanostructures preferentially in first selected regions of the surface of the substrate and not in second selected regions of the substrate.
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Specification