Ut-battelle, Inc.

U.S. Geological Survey

Applicote, LLC

Pooran Chandra Joshi

Chad Edward Duty

Ilia N Ivanov

Beth Louise Armstrong

Tommy Joe Phelps

Gerald Earle Jellison, Jr

Stephen M Killough

Nathaniel R Quick

Lonnie J Love

Robert J Warmack

Tolga Aytug

Vlastimil Kunc

Adam Justin Rondinone

Ahmed A Hassen

John M Lindahl

Seokpum Kim

Ronald S Oremland

Michelle K Kidder

Ji-Won Moon

Gyoung Gug Jang

Joseph A Angelini

Ji Won Moon

Jordan A Failla

Phani Teja Kuruganti

Sean Campbell Smith

David E Graham

Tyler C H Smith

Hyunsung Jung

Phani Teja V Kuruganti

Christopher B Jacobs

Christine Fisher

A low-cost and low-power polyaniline-based (PANI) gas sensor is provided. The PANI-based gas sensor is formed on a flexible polyimide (PI) substrate using additive manufacturing techniques. The gas sensor can include silver interdigitated electrode (IDE) arrays and conducting polymeric sensing films (i.e., PANI) that are printed onto the PI substrate using a direct-write technology of aerosol-jet printing. Aerosol-jet printing enables high-resolution, non-contact deposition of both the electrode and chemically sensitive materials. The gas sensor is optionally capable of 5 ppm sensitivity and a sub-ppm detection limit.

Gas sensor and method of manufacture

A structural health monitoring method is provided that utilizes self-sensing printed polymer structures. The method is based on resistivity properties of conductive materials, which can be integrated to a 3D printed polymer structure during additive manufacturing. An article to be monitored has at least one 3D printed polymer structure including a circuit comprising at least one conductive pathway extending through a non-conductive material. The resistance across the circuit is measured during or after loading of the article to determine a resistance value. The measured resistance value is compared to a known resistance value, and based on the comparison, a defect can be detected in the 3D printed polymer structure. Structural health monitoring systems and articles with integrated structural health monitoring are also provided.

Self-sensing of printed polymer structures

A system and method (referred to as a method) to fabricate sensors and electronic circuits. The method prints a first thin-film having an electronic conductivity of about less than a millionth of a Siemens per meter and a permalloy directly onto the first thin-film. The permalloy has a magnetic permeability greater than a predetermined level and has a thickness within a range of about 1 to 20 microns. The system prints a second thin-film directly onto the permalloy to encapsulate the permalloy onto the first thin-film and prints conductive traces directly onto the surfaces of the first-thin-film, the permalloy, and the second thin-film. In some applications, a sensor is packaged in an additively manufactured three-dimensional cylindrical shape that can be mounted on or is a unitary part of a current carrying conductor without incising, sharing, or severing (e.g., cutting) the current carrying conductor or its insulation.

Flexible sensor technology

A method for producing metal chalcogenide nanoparticles, the method comprising: (i) producing hydrogen chalcogenide-containing vapor from a microbial source, wherein said microbial source comprises: (a) chalcogen-reducing microbes capable of producing hydrogen chalcogenide vapor from a chalcogen-containing source; (b) a culture medium suitable for sustaining said chalcogen-reducing microbes; (c) at least one chalcogen-containing compound that can be converted to hydrogen chalcogenide vapor by said chalcogen-reducing microbes; and (d) at least one nutritive compound that provides donatable electrons to said chalcogen-reducing microbes during consumption of the nutritive compound by said chalcogen-reducing microbes; and (ii) directing said hydrogen chalcogenide-containing vapor into a metal-containing solution comprising a metal salt dissolved in a solvent to produce metal chalcogenide nanoparticles in said solution, wherein said chalcogen is sulfur or selenium, and said chalcogenide is sulfide or selenide, respectively. The invention is also directed to metal chalcogenide nanoparticle compositions produced as above and having distinctive properties.

Microbially-mediated method for synthesis of metal chalcogenide nanoparticles

The invention is directed to a method for producing metal-containing particles, the method comprising subjecting an aqueous solution comprising a metal salt, E, lowering reducing agent, pH adjusting agent, and water to conditions that maintain the Evalue of the solution within the bounds of an E-pH stability field corresponding to the composition of the metal-containing particles to be produced, and producing said metal-containing particles in said aqueous solution at a selected Evalue within the bounds of said E-pH stability field. The invention is also directed to the resulting metal-containing particles as well as devices in which they are incorporated.

Controllable reductive method for synthesizing metal-containing particles

A wireless sensor platform and methods of manufacture are provided. The platform involves providing a plurality of wireless sensors, where each of the sensors is fabricated on flexible substrates using printing techniques and low temperature curing. Each of the sensors can include planar sensor elements and planar antennas defined using the printing and curing. Further, each of the sensors can include a communications system configured to encode the data from the sensors into a spread spectrum code sequence that is transmitted to a central computer(s) for use in monitoring an area associated with the sensors.

Wireless sensor platform

A method is disclosed for processing an insulator material or a semiconductor material. The method includes pulsing a plasma lamp onto the material to diffuse a doping substance into the material, to activate the doping substance in the material or to metallize a large area region of the material. The method may further include pulsing a laser onto a selected region of the material to diffuse a doping substance into the material, to activate the doping substance in the material or to metallize a selected region of the material.

Processing of insulators and semiconductors

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Knoxville, TN, United States of America

Pooran Chandra Joshi