Patents by Inventor David B. Geohegan
David B. Geohegan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9964846Abstract: Methods, articles of manufacture and systems for creating new nanoscale two dimensional materials comprising designed arrays of lateral or vertical heterojunctions may be fabricated by first lithographically masking a 2D material. Exposed, or unmasked, regions of the 2D material may be converted to a different composition of matter to form lateral or vertical heterojunctions according to the patterned mask. PLD and high kinetic energy impingement of atoms may replace or add atoms in the exposed regions, and a plurality of the exposed regions may be converted concurrently. The process may be repeated one or more times on either side of the same 2D material to form any suitable combination of lateral heterojunctions and/or vertical heterojunctions, comprising semiconductors, metals or insulators or any suitable combination thereof. Furthermore, the resulting 2D material may comprise p-n, n-n, p-p, n-p-n and p-n-p junctions, or any suitable combination thereof.Type: GrantFiled: July 20, 2016Date of Patent: May 8, 2018Assignee: UT Battelle, LLCInventors: David B. Geohegan, Christopher M. Rouleau, Kai Wang, Kai Xiao, Ming-Wei Lin, Alexander A. Puretzky, Masoud Mahjouri-Samani
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Patent number: 9759622Abstract: The present invention, in one embodiment, provides a method of measuring pressure or temperature using a sensor including a sensor element composed of a plurality of carbon nanotubes. In one example, the resistance of the plurality of carbon nanotubes is measured in response to the application of temperature or pressure. The changes in resistance are then recorded and correlated to temperature or pressure. In one embodiment, the present invention provides for independent measurement of pressure or temperature using the sensors disclosed herein.Type: GrantFiled: September 24, 2013Date of Patent: September 12, 2017Assignee: UT-BATTELLE, LLCInventors: Ilia N. Ivanov, David B. Geohegan
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Publication number: 20170025505Abstract: Methods, articles of manufacture and systems for creating new nanoscale two dimensional materials comprising designed arrays of lateral or vertical heterojunctions may be fabricated by first lithographically masking a 2D material. Exposed, or unmasked, regions of the 2D material may be converted to a different composition of matter to form lateral or vertical heterojunctions according to the patterned mask. PLD and high kinetic energy impingement of atoms may replace or add atoms in the exposed regions, and a plurality of the exposed regions may be converted concurrently. The process may be repeated one or more times on either side of the same 2D material to form any suitable combination of lateral heterojunctions and/or vertical heterojunctions, comprising semiconductors, metals or insulators or any suitable combination thereof. Furthermore, the resulting 2D material may comprise p-n, n-n, p-p, n-p-n and p-n-p junctions, or any suitable combination thereof.Type: ApplicationFiled: July 20, 2016Publication date: January 26, 2017Inventors: David B. Geohegan, Christopher M. Rouleau, Kai Wang, Kai Xiao, Ming-Wei Lin, Alexander A. Puretzky, Masoud Mahjouri-Samani
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Patent number: 9518885Abstract: The present invention, in one embodiment, provides a method of measuring pressure or temperature using a sensor including a sensor element composed of a plurality of carbon nanotubes. In one example, the resistance of the plurality of carbon nanotubes is measured in response to the application of temperature or pressure. The changes in resistance are then recorded and correlated to temperature or pressure. In one embodiment, the present invention provides for independent measurement of pressure or temperature using the sensors disclosed herein.Type: GrantFiled: September 24, 2013Date of Patent: December 13, 2016Assignee: UT-BATTELLE, LLCInventors: Ilia N. Ivanov, David B. Geohegan
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Patent number: 9494478Abstract: The present invention, in one embodiment, provides a method of measuring pressure or temperature using a sensor including a sensor element composed of a plurality of carbon nanotubes. In one example, the resistance of the plurality of carbon nanotubes is measured in response to the application of temperature or pressure. The changes in resistance are then recorded and correlated to temperature or pressure. In one embodiment, the present invention provides for independent measurement of pressure or temperature using the sensors disclosed herein.Type: GrantFiled: September 24, 2013Date of Patent: November 15, 2016Assignee: UT-BATTELLE, LLCInventors: Ilia N. Ivanov, David B. Geohegan
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Patent number: 9476785Abstract: The present invention, in one embodiment, provides a method of measuring pressure or temperature using a sensor including a sensor element composed of a plurality of carbon nanotubes. In one example, the resistance of the plurality of carbon nanotubes is measured in response to the application of temperature or pressure. The changes in resistance are then recorded and correlated to temperature or pressure. In one embodiment, the present invention provides for independent measurement of pressure or temperature using the sensors disclosed herein.Type: GrantFiled: September 24, 2013Date of Patent: October 25, 2016Assignee: UT-BATTELLE, LLCInventors: Ilia N. Ivanov, David B. Geohegan
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Patent number: 8778226Abstract: A photoluminescent or electroluminescent system and method of making a non-luminescent nanostructured material into such a luminescent system is presented. The method of preparing the luminescent system, generally, comprises the steps of modifying the surface of a nanostructured material to create isolated regions to act as luminescent centers and to create a charge imbalance on the surface; applying more than one polar molecule to the charged surface of the nanostructured material; and orienting the polar molecules to compensate for the charge imbalance on the surface of the nanostructured material. The compensation of the surface charge imbalance by the polar molecules allows the isolated regions to exhibit luminescence.Type: GrantFiled: September 30, 2010Date of Patent: July 15, 2014Inventors: Ilia N. Ivanov, Alexander A. Puretzky, Bin Zhao, David B. Geohegan, David J. Styers-Barnett, Hui Hu
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Publication number: 20140020474Abstract: The present invention, in one embodiment, provides a method of measuring pressure or temperature using a sensor including a sensor element composed of a plurality of carbon nanotubes. In one example, the resistance of the plurality of carbon nanotubes is measured in response to the application of temperature or pressure. The changes in resistance are then recorded and correlated to temperature or pressure. In one embodiment, the present invention provides for independent measurement of pressure or temperature using the sensors disclosed herein.Type: ApplicationFiled: September 24, 2013Publication date: January 23, 2014Applicant: UT-BATTELLE LLCInventors: Ilia N. Ivanov, David B. Geohegan
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Publication number: 20140020471Abstract: The present invention, in one embodiment, provides a method of measuring pressure or temperature using a sensor including a sensor element composed of a plurality of carbon nanotubes. In one example, the resistance of the plurality of carbon nanotubes is measured in response to the application of temperature or pressure. The changes in resistance are then recorded and correlated to temperature or pressure. In one embodiment, the present invention provides for independent measurement of pressure or temperature using the sensors disclosed herein.Type: ApplicationFiled: September 24, 2013Publication date: January 23, 2014Applicant: UT-BATTELLE LLCInventors: Ilia N. Ivanov, David B. Geohegan
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Publication number: 20140023116Abstract: The present invention, in one embodiment, provides a method of measuring pressure or temperature using a sensor including a sensor element composed of a plurality of carbon nanotubes. In one example, the resistance of the plurality of carbon nanotubes is measured in response to the application of temperature or pressure. The changes in resistance are then recorded and correlated to temperature or pressure. In one embodiment, the present invention provides for independent measurement of pressure or temperature using the sensors disclosed herein.Type: ApplicationFiled: September 24, 2013Publication date: January 23, 2014Applicant: UT-BATTELLE LLCInventors: Ilia N. Ivanov, David B. Geohegan
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Publication number: 20140016671Abstract: The present invention, in one embodiment, provides a method of measuring pressure or temperature using a sensor including a sensor element composed of a plurality of carbon nanotubes. In one example, the resistance of the plurality of carbon nanotubes is measured in response to the application of temperature or pressure. The changes in resistance are then recorded and correlated to temperature or pressure. In one embodiment, the present invention provides for independent measurement of pressure or temperature using the sensors disclosed herein.Type: ApplicationFiled: September 24, 2013Publication date: January 16, 2014Applicant: UT-BATTELLE LLCInventors: Ilia N. Ivanov, David B. Geohegan
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Publication number: 20120080646Abstract: A photoluminescent or electroluminescent system and method of making a non-luminescent nanostructured material into such a luminescent system is presented. The method of preparing the luminescent system, generally, comprises the steps of modifying the surface of a nanostructured material to create isolated regions to act as luminescent centers and to create a charge imbalance on the surface; applying more than one polar molecule to the charged surface of the nanostructured material; and orienting the polar molecules to compensate for the charge imbalance on the surface of the nanostructured material. The compensation of the surface charge imbalance by the polar molecules allows the isolated regions to exhibit luminescence.Type: ApplicationFiled: September 30, 2010Publication date: April 5, 2012Inventors: Ilia N. Ivanov, Alexander A. Puretzky, Bin Zhao, David B. Geohegan, David J. Styers-Barnett, Hui Hu
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Patent number: 7815973Abstract: Compositions, systems and methods are described for condensed phase conversion and growth of nanorods and other materials. A method includes providing a condensed phase matrix material; and activating the condensed phase matrix material to produce a plurality of nanorods by condensed phase conversion and growth from the condensed phase matrix material instead of from vapor. The compositions are very strong. The compositions and methods provide advantages because they allow (1) formation rates of nanostructures necessary for reasonable production rates, and (2) the near net shaped production of component structures.Type: GrantFiled: January 18, 2005Date of Patent: October 19, 2010Assignees: UT-Battelle, LLC, University of Tennessee Research FoundationInventors: David B. Geohegan, Roland D. Seals, Alex A. Puretzky, Xudong Fan
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Patent number: 7763353Abstract: Methods and apparatus are described for fabrication of high thermal conductivity arrays of carbon nanotubes and their composites. A composition includes a vertically aligned nanotube array including a plurality of nanotubes characterized by a property across substantially all of the vertically aligned nanotube array. A method includes depositing a vertically aligned nanotube array that includes a plurality of nanotubes; and controlling a deposition rate of the vertically aligned nanotubes array as a function of an in situ monitored property of the plurality of nanotubes.Type: GrantFiled: June 10, 2005Date of Patent: July 27, 2010Assignees: UT-Battelle, LLC, University of Tennessee Research FoundationInventors: David B. Geohegan, Ilya N. Ivanov, Alexander A. Puretzky
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Patent number: 7491934Abstract: Methods and apparatus are described for SEM imaging and measuring electronic transport in nanocomposites based on electric field induced contrast. A method includes mounting a sample onto a sample holder, the sample including a sample material; wire bonding leads from the sample holder onto the sample; placing the sample holder in a vacuum chamber of a scanning electron microscope; connecting leads from the sample holder to a power source located outside the vacuum chamber; controlling secondary electron emission from the sample by applying a predetermined voltage to the sample through the leads; and generating an image of the secondary electron emission from the sample.Type: GrantFiled: January 13, 2006Date of Patent: February 17, 2009Assignee: UT-Battelle, LLCInventors: Stephen Jesse, David B. Geohegan, Michael Guillorn
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Patent number: 6923946Abstract: Compositions, systems and methods are described for condensed phase conversion and growth of nanorods and other materials. A method includes providing a condensed phase matrix material; and activating the condensed phase matrix material to produce a plurality of nanorods by condensed phase conversion and growth from the condensed chase matrix material instead of from vacor. The compositions are very strong. The compositions and methods provide advantages because they allow (1) formation rates of nanostructures necessary for reasonable production rates, and (2) the near net shaped production of component structures.Type: GrantFiled: November 28, 2001Date of Patent: August 2, 2005Assignee: UT-Battelle, LLCInventors: David B. Geohegan, Roland D. Seals, Alex A. Puretzky, Xudong Fan
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Patent number: 4649059Abstract: A novel method and system for depositing films of selected metallic or semiconductor materials, and particularly of the group III, IV, and V elements, is described which comprises heating a halide compound of the material to produce vapor within a substantially closed chamber, irradiating the vapor with light of preselected wavelength to dissociatively photoionize the vapor into the constituent positive ions of the material and negative halogen ions, and subjecting the photoionized vapor to an electric field to selectively remove the positive ions of the material for plating as a film.Type: GrantFiled: May 29, 1985Date of Patent: March 10, 1987Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: James G. Eden, David B. Geohegan
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Patent number: 4606034Abstract: The efficiency of pulsed laser systems is enhanced substantially by injecting a minor amount of radiation energy into the system .DELTA.t seconds prior to the emergence of the laser pulse. The degree of power enhancement is a function of both radiation wavelength and time delay.Type: GrantFiled: February 19, 1985Date of Patent: August 12, 1986Assignee: Board of Trustees, University of IllinoisInventors: James G. Eden, Andrew W. McCown, David B. Geohegan