University of Massachusetts Amherst

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Hierarchically Ordered Nanoscale Electric Field Concentrators for Embedded Thin Film Devices
Resistance switching devices, also known as memristive devices, represent the next generation in computing. With a typical metal-oxide-metal structure, memristors change resistance under different external biases and retain this new resistance even when power is turned off. This allows memristors to store data without needing constant power like in traditional computer memory. Memristors have other desirable properties such as low power consumption, fast switching speed, and multistate logic potential. These properties open up next generation computing applications in non-volatile memory, reconfigurable switches, bio-inspired neuromorphic computing, and radiofrequency switches. However, before these applications are enabled, significant technical challenges in memristors must be overcome. These include cycle-to-cycle instabilities in operating voltage and resistance states, which cause memory retention and device endurance issues.

 

Professor Stephen Nonnenmann and his laboratory address these instability issues by embedding highly ordered metal nanoislands in the memristor’s oxide switching layer. Through a unique template-directed nanoisland embedding procedure, the nanoisland diameter, spacing, and area density can be precisely controlled. The Nonnenmann lab found that through precise control of these variables, the growth of conductive filaments formed through the memristor’s oxide layer, which enable its unique properties, can be more precisely controlled, leading to a nearly 100% improvement in uniformity performance in one device case.

Published: 5/20/2019   |   Inventor(s): Stephen Nonnenmann, Jiaying Wang
Category(s): Computers, Electronics, Engineering, Nanotechnology, Material science, Devices & sensors
Novel Hydrophilic Conjugated Polymers as Efficient Hole Extraction Layers for Solar Cell Applications
This invention provides novel hydrophilic conjugated polymers that can be used as hole extraction layers in solar cells to enhance power conversion efficiency and solar cell stability. The polymers can be synthesized in water at room temperatures without using toxic transition metals or flammable organic solvents.
Published: 2/28/2019   |   Inventor(s): Todd Emrick, Zachariah Page, Yao Liu, Thomas Russell
Category(s): Physical Science, Material science, Clean Energy
Nanopatterned Articles Produced Using Reconstructed Block Copolymer Films
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Published: 2/26/2019   |   Inventor(s): Thomas Russell, Soojin Park, Jia-Yu Wang, Bokyung Kim
Category(s): Material science, Nanotechnology, Devices, Engineering, Computers
A Simple, Scalable Method for Producing Bicontinuous Jammed Emulsions (or Bijels) with Sub-micrometer Domains
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Published: 9/14/2018   |   Inventor(s): Thomas Russell, Caili Huang, Joseph Forth, Brett Helms
Category(s): Physical Science, Nanotechnology, Material science
Sub-5 nm Full Pitch Lamellar Microdomains by Chemical Transformation
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Published: 8/24/2018   |   Inventor(s): Thomas Russell, Duk Man Yu, Javid Rzayev, Jose Kenneth Mapas
Category(s): Material science, Nanotechnology, Physical Science
Method, Device and System for Active Cooling of Cold-Spray Nozzles
Cold Spray technology is a deposition process in which metal powder particles are accelerated by injection into a high-velocity stream of gas at temperatures below their melting point through a de Laval nozzle. However, clogging in the inside of the nozzle during the deposition process presents a significant challenge for this technology. This UMass Amherst invention provides a new method, device and system for active cooling of cold spray nozzles that can effectively prevent clogging and increase the operating life of the nozzles.
Published: 8/24/2018   |   Inventor(s): James Watkins, David Schmidt, Jacobo Morere Rodriguez, Victor Champagne
Category(s): Devices, Engineering, Material science
Direct Printing of 3-D Microbatteries and High Surface-Area Electrodes
This invention provides highly scalable methods to fabricate 3-D lithium ion microbatteries and high surface-area electrodes for microbatteries. The methods involve imprint patterning nanoparticle-based inks using nanoimprint lithography to form high surface-area electrodes and 3-D microbatteries with well-engineered architectures. The 3-D microbatteries offer superior performance with greatly enhanced capacity and power, and can be rapidly charged and discharged.
Published: 8/22/2018   |   Inventor(s): James Watkins, Wenhao Li
Category(s): Material science, Nanotechnology, Physical Science
Dual-Functional Substates for SERS- and SEIRAS-Based Detection of Analytes
This invention provides cost-effective, dual-functional substrates for analyte detection by using Surface Enhanced Raman Spectroscopy (SERS) and Surface Enhanced Infrared Absorption Spectroscopy (SEIRAS).
Published: 5/10/2018   |   Inventor(s): Lili He, Chen Tan
Category(s): Material science, Nanotechnology, Research tools
Large Area Formation of Porous Media and Patterned Carbon Composites
This invention provides rapid and low cost methods to make porous media and carbon composite materials as high-performance components for energy storage, electronics, senors and other applications.
Published: 5/9/2018   |   Inventor(s): James Watkins, Dong-Po Song
Category(s): Physical Science, Nanotechnology, Material science
Flame Retardant Monomers and Crosslinked Polymers
This invention provides flame retardant monomers and polymers. The monomers are unsaturated deoxybenzoin compounds that are inherently fire resistant and can decrease the flammability of unsaturated polymers by crosslinking the polymers.
Published: 5/1/2018   |   Inventor(s): Todd Emrick, E. Bryan Coughlin, Megan Szyndler, Aabid Mir, Justin Timmons
Category(s): Chemicals, Material science, Physical Science
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