RESISTIVE ELEMENTS USING CARBON NANOTUBES
First Claim
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1. A resistive element, comprising:
- a patterned region of nanofabric with a redefined area and a pre-selected sheet resistance, the nanofabric having a pre-selected temperature coefficient of resistance (TCR); and
first and second electrical contacts contacting the patterned region of nanofabric and in spaced relation to each other, wherein a total resistance of the resistive element between the first and second electrical contacts is determined by the predefined area of the patterned region of nanofabric, the pre-selected sheet resistance of the patterned region of nanofabric between the first and second electrical contacts, and the pre-selected TCR of the nanofabric, and the spaced relation of the first and second electrical contacts; and
wherein the total resistance of the resistive element is tunable to a pre-selected total resistance.
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Abstract
Resistive elements include a patterned region of nanofabric having a predetermined area, where the nanofabric has a selected sheet resistance; and first and second electrical contacts contacting the patterned region of nanofabric and in spaced relation to each other. The resistance of the element between the first and second electrical contacts is determined by the selected sheet resistance of the nanofabric, the area of nanofabric, and the spaced relation of the first and second electrical contacts. The bulk resistance is tunable.
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Citations
63 Claims
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1. A resistive element, comprising:
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a patterned region of nanofabric with a redefined area and a pre-selected sheet resistance, the nanofabric having a pre-selected temperature coefficient of resistance (TCR); and
first and second electrical contacts contacting the patterned region of nanofabric and in spaced relation to each other, wherein a total resistance of the resistive element between the first and second electrical contacts is determined by the predefined area of the patterned region of nanofabric, the pre-selected sheet resistance of the patterned region of nanofabric between the first and second electrical contacts, and the pre-selected TCR of the nanofabric, and the spaced relation of the first and second electrical contacts; and
wherein the total resistance of the resistive element is tunable to a pre-selected total resistance. - 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, 42, 43)
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30. A method of making a resistive element, comprising:
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providing a substrate;
providing a layer of nanotubes disposed on the substrate, wherein providing the layer comprises selecting a porosity of the layer and further comprises pre-selecting a ratio of metallic and semiconducting nanotubes forming the layer to determine a pre-selected range of values of a temperature coefficient of resistance (TCR) for the resistive element;
patterning the layer of nanotubes to form a patterned region of nanofabric to provide a pre-selected sheet resistance of the layer;
providing first and second electrical contacts in contact with the patterned region of nanofabric; and
tuning a total resistance of the resistive element between the first and second electrical contacts to a pre-selected total resistance. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63)
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Specification