Notre Dame Research

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  • Author(s):
    Melissa Grupen-Shemansky
    Abstract:

    This report was developed under a DARPA contract for topic Atoms to products. Two primary goals were addressed in this project. In Focus Area 1 (Assembly Development) the goal was to assemble a 10 μm microelement consisting of an anisotropic lattice of ~5000 (~100 nm) dielectric nanoparticles (NPs) embedded in a polymer electrolyte. Successful completion of the objectives of this goal required that NPs be spatially located with nm-scale precision in a polymer matrix at scales up to ~10 μm (to…

    Date Created:
    2020-04-03
    Record Visibility:
    Public
    Resource Type
    Report
  • Author(s):
    Christopher Smyth, Lee Walsh, Pavel Bolshakov, Massimo Catalano, Michael Schmidt, Brendan Sheehan, Rafik Addou, Luhua Wang, Jiyoung Kim, Moon Kim, Christopher Hinkle, Robert Wallace
    Abstract:

    Sc has been employed as an electron contact to a number of two-dimensional (2D) materials (e.g. MoS2, black phosphorous) and has enabled, at times, the lowest electron contact resistance. However, the extremely reactive nature of Sc leads to stringent processing requirements and metastable device performance with no true understanding of how to achieve consistent, high-performance Sc contacts. In this work, WSe2 transistors with impressive subthreshold slope (109 mV dec−1) and I ON/I OFF (106…

    Date Published:
    2019-07
    Record Visibility:
    Public
  • Author(s):
    Christopher Smyth, Lee Walsh, Pavel Bolshakov, Massimo Catalano, Michael Schmidt, Brendan Sheehan, Rafik Addou, Luhua Wang, Jiyoung Kim, Moon Kim, Christopher Hinkle, Robert Wallace
    Abstract:

    Sc has been employed as an electron contact to a number of two-dimensional (2D) materials (e.g. MoS2, black phosphorous) and has enabled, at times, the lowest electron contact resistance. However, the extremely reactive nature of Sc leads to stringent processing requirements and metastable device performance with no true understanding of how to achieve consistent, high-performance Sc contacts. In this work, WSe2 transistors with impressive subthreshold slope (109 mV dec−1) and I ON/I OFF (106…

    Date Published:
    2019-07
    Record Visibility:
    Public
  • Author(s):
    Robert Hughes, Sergei Rouvimov, Robert Neal, Trevor B. Demille, Svetlana Neretina
    Abstract:

    The seed-mediated growth of noble metal nanostructures with planar geometries requires the use of seeds lined with parallel stacking faults so as to provide a break in symmetry in an otherwise isotropic metal. Although such seeds are now routinely synthesized using colloidal pathways, equivalent pathways have not yet been reported for the fabrication of substrate-based seeds with the same internal defect structures. The challenge is not merely to form seeds with planar defects but to do so in…

    Date Published:
    2019-07
    Record Visibility:
    Public
  • Author(s):
    K. Manukyan, C. Fesano, A. Majumdar, G. Peaslee, M. Raddell
    Abstract:

    This work presents results of macro, micro, and nanoscale surface characterization for a set of Roman denarii, ranging from 136 BCE to 240 CE, using large-scale X-ray fluorescence (XRF) mapping, particle-induced X-ray emission (PIXE) spectroscopy, focused-ion-beam-assisted scanning electron microscopy (FIB-SEM) with energy dispersive spectroscopy (EDS). The combination of XRF and PIXE, with varying beam energies, allowed for visualization and quantification of individual elements as a functio…

    Record Visibility:
    Public
  • Author(s):
    J. M. Pauls, N. F. Shkodich, A. S. Mukasyan
    Abstract:

    We report the results from the investigation of the mechanisms of self-sustained reaction in mechanically induced TiN/B nanocomposites. The exothermic displacement reaction, 3B + TiN → BN + TiB2, with an adiabatic reaction temperature of 1905 K, was initiated through two different means: localized thermal heating and mechanical stimulation by high-energy ball milling. Comprehensive studies strongly indicate that the chemical interaction in the system involves three main stages. Solid-state ma…

    Date Published:
    2019-04
    Record Visibility:
    Public