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
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
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
A Novel, Low-Cost Substrate System for Gas-Phase or Multiphase Analyte Detection Using Surface-Enhanced Raman Scattering (SERS)
This invention provides a new and low-cost substrate system and related methods for highly sensitive detection of analytes in a gaseous phase or multiphase sample medium.
Published: 6/21/2018   |   Inventor(s): Lili He, Haoxin Chen
Category(s): Research tools, Food technology & plant science, Nanotechnology
Simple and Rapid Optical Detection of Bacteria Using a Mobile Device
This invention provides cost-effective substrates and a rapid method for detection of bacteria in food, water or other materials, or on material surfaces using a mobile device, such as a smartphone attached to an inexpensive smartphone microscope.
Published: 5/17/2018   |   Inventor(s): Lili He, Brooke Pearson
Category(s): Food technology & plant science, Nanotechnology, Research tools, Devices & sensors
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
Low Cost, Durable Master Molds for Pattern Transfer
This invention provides a method to make low cost, durable master molds for micro- and nano-scale pattern transfer. The transferred pattern can have a variety of functional utilities such as manipulating wetting, adhesion an antimicrobial properties, inducing color, harvesting light, etc. The master molds can be created on flexible substrates, enabling additional opportunities including roll-to-roll embossing and use in blow molding and other operations.
Published: 4/30/2018   |   Inventor(s): James Watkins, Feyza Dundar
Category(s): Material science, Nanotechnology, Physical Science
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