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Highlights

Highlights

Atomic Force Microscopy (AFM) image of an Nb4C3Tx MXene flake covering an 820 nm microwell in a Si/SiO2 substrate. The color map reflects AFM measured height on the sample. The blue spot indicates an AFM-indented area of the flake atop of the microwell.
Atomic Force Microscopy (AFM) image of an Nb4C3Tx MXene flake covering an 820 nm microwell in a Si/SiO2 substrate. The color map reflects AFM measured height on the sample. The blue spot indicates an AFM-indented area of the flake atop of the microwell.
May 25, 2020
UNL Materials Research Science and Engineering Center (2014)

Nanoscale Properties of MXene Membranes

A. Sinitskii and A. Gruverman (University of Nebraska-Lincoln) and Y. Gogotsi (Drexel University)
MXenes are two-dimensional (2D) ceramics made of transition metal carbides and nitrides. Unlike other 2D ceramics, MXenes have inherently good conductivity and thus are promising for various applications. Probing the local physical properties of MXenes monolayers is important for the understanding of their functional performance. Nebraska MRSEC researchers in collaboration with their colleagues at Drexel University have developed an improved method for synthesis of monolayer membranes of Nb4C3Tx MXene.
Schematic showing a ferroelectric tunnel junction (FTJ) with a composite barrier consisting of a ferroelectric layer (red) and a polar lanthanum aluminate (LaAlO3) layer (brown). The LaAlO3 layer creates a positive ionic charge at the interface which pins ferroelectric polarization (P) away from it. This property makes one state having a uniform polarization (top panel) and the other state having a head-to-head polarization (bottom panel). As a result the resistance of the FTJ corresponding to the two polarization states differs significantly, resulting in the enhanced TER effect.
Schematic showing a ferroelectric tunnel junction (FTJ) with a composite barrier consisting of a ferroelectric layer (red) and a polar lanthanum aluminate (LaAlO3) layer (brown). The LaAlO3 layer creates a positive ionic charge at the interface which pins ferroelectric polarization (P) away from it. This property makes one state having a uniform polarization (top panel) and the other state having a head-to-head polarization (bottom panel). As a result the resistance of the FTJ corresponding to the two polarization states differs significantly, resulting in the enhanced TER effect.
May 25, 2020
UNL Materials Research Science and Engineering Center (2014)

Ferroelectric Tunnel Junctions Enhanced by a Polar Oxide Barrier Layer

Qiong Yang, Lingling Tao, Evgeny Tsymbal, and Vitali Alexandrov (University of Nebraska-Lincoln)
Nebraska MRSEC researchers have proposed a new concept to design high-performance ferroelectric tunnel junctions with enhanced tunneling electroresistance (TER). This design exploits property of a polar oxide material to create an ionic charge at the interface.
May 22, 2020
Northwestern Materials Research Science and Engineering Center

Northwestern University Center for Atom Probe Tomography
Northwestern University MRSEC Shared Facilities play a central role in education and outreach programs. For example, the Northwestern University Center for Atom Probe Tomography recently hosted a two-day workshop to offer hands-on user training in the  latest methods in atom probe tomography including materials analysis and visualization tools.
May 22, 2020
Northwestern Materials Research Science and Engineering Center

Facilitating Technology Transfer and Commercialization
In partnership with the Northwestern University Kellogg School of Management, McCormick School of Engineering, Pritzker School of Law, and Innovation and New Ventures Office, the Northwestern University MRSEC fosters a comprehensive innovation ecosystem that allows fundamental research to be transferred to the market via startup companies.
May 22, 2020
Northwestern Materials Research Science and Engineering Center

Professional Development Workshops: Supporting Women in STEM in Tanzania
The Northwestern University MRSEC sponsors the Women Supporting Women in the Sciences initiative, which is a partnership with the University of Dodoma and the Nelson Mandela African Institution for Science and Technology in Tanzania. This initiative develops professional development workshops for female STEM students.
May 22, 2020
Northwestern Materials Research Science and Engineering Center

Northwestern Prison Education Program
The Northwestern Prison Education Program is an initiative to provide a high-quality liberal arts and STEM education to incarcerated students in Illinois in partnership with Oakton Community College and the Illinois Department of Corrections. Responding to the crisis of mass incarceration, NPEP fills a vital need by being the only degree-granting program in the State of Illinois with a full liberal arts curriculum including STEM courses for incarcerated students.
May 22, 2020
Northwestern Materials Research Science and Engineering Center

Improving Water Desalination with Molecularly Precise Porous Membranes
Through molecular dynamics simulations, the Northwestern University MRSEC Super-Seed has studied the dependence of pore size dimension on the desalination properties of COF membranes.
May 22, 2020
Northwestern Materials Research Science and Engineering Center

Ultrafast Photoswitches for Reconfigurable Mixed-Dimensional Heterojunctions
This Northwestern University MRSEC seed project is designing and building molecules to bridge the QD-MoS2 interface, thus enabling control over this ultrafast charge transfer. These photoswitchable molecules can be rapidly toggled between two different states using different colors of light.
May 22, 2020
Northwestern Materials Research Science and Engineering Center

Machine-Learning Guided Discovery of Ternary Heteroanionic Semiconductors
Recently, novel methods based on materials informatics and machine-learning models have emerged to assist the search for materials with improved properties in industrially relevant applications. To apply this approach in heteroanionic materials discovery, NU-MRSEC IRG-2 has reported a computational investigation of a series of ternary HetMs with tunable band gaps from machine-learning and crystal structure prediction.
May 22, 2020
Northwestern Materials Research Science and Engineering Center

Enhancing the Electronic Properties of Indium Oxide via Heteroanionic Doping
Heteroanionic doping of metal oxide semiconductors enables unique optoelectronic properties as a result of the tunable bonding and variable charge transport properties imparted by diverse anion chemistry. Here the effects of fluoride (Fˉ) doping in an archetypical metal oxide semiconductor, indium oxide (In-O), is studied.

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