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  • Author(s):
    Courtney Hollar, Zhaoyang Lin, Madhusudan Kongara, Tony Varghese, Chinnathambi Karthik, Jess Schimpf, Josh Eixenberger, Paul Davis, Yaqio Wu, Xiangfeng Duan, Yanliang Zhang, David Estrada
    Abstract:

    Thermoelectric generators are an environmentally friendly and reliable solid-state energy conversion technology. Flexible and low-cost thermoelectric generators are especially suited to power flexible electronics and sensors using body heat or other ambient heat sources. Bismuth telluride (Bi2Te3) based thermoelectric materials exhibit their best performance near room temperature making them an ideal candidate to power wearable electronics and sensors using body heat. In this report, Bi2Te3 t…

    Date Published:
    2020-05
    Record Visibility:
    Public
  • Author(s):
    Stefano Toso, Ilia Pavlovetc, Maksym Zhukovskyi, Sergio Marras, Masaru Kuno, Liberato Mann, Dmitry Baranov
    Abstract:

    Perovskite nanocrystal superlattices (NC SLs) are the nearest real-world approximations to monodisperse NC ensembles. NC SLs thus represent ideal model systems for evaluating the optical and structural stability of CsPb(I1−xBrx)3 NCs at a macroscopic level. Here, photoinduced changes to CsPb(I1−xBrx)3 NC SLs (0 < x < 1.0) are probed via in situ photoluminescence, X-ray diffraction, and electron microscopy. We find that prolonged (∼10−20 h) ultraviolet−visible irradiation causes irrevers…

    Date Published:
    2020-11
    Record Visibility:
    Public
  • Author(s):
    Prateek Mehta, Patrick Barboun, Yannick Engelmann, David Go, Annemie Bogaerts, William Schneider, Jason Hicks
    Abstract:

    We explore the consequences of nonthermal plasma-activation on product yields in catalytic ammonia synthesis, a reaction that is equilibrium-limited at elevated temperatures. We employ a minimal microkinetic model that incorporates the influence of plasma-activation on N2 dissociation rates to predict NH3 yields into and across the equilibrium-limited regime. NH3 yields are predicted to exceed bulk thermodynamic equilibrium limits on materials that are thermal-rate-limited by N2 dissociation….

    Date Published:
    2020-05
    Record Visibility:
    Public
  • Author(s):
    Paul Plachinda, Michael Hopkins, Sergei Rouvimov, Raj Solanki
    Abstract:

    We have employed atomic layer deposition to produce uniform films of Bi 2Se 3, which is a 3D topological insulator (TI), over 5 cm × 5 cm SiO 2-coated Si substrates. The crystalline properties of the films were characterized via Raman spectroscopy, x-ray diffraction, cross-sectional transmission microscopy, and atomic force microscopy, which confirmed the high quality of the films. The TI properties were examined using Hall bridge structures and recording magnetoresistance at 1.9 K. A weak an…

    Date Published:
    2020-01
    Record Visibility:
    Public
  • Author(s):
    Trevor B. Demille, Robert A. Hughes, Nathaniel Dominique, Jacob E. Olson, Sergei Rouvimov, Jon P. Camden, Svetlana Neretina
    Abstract:

    A method for the nanofabrication of periodic arrays of gold nanostars yielding a unique morphology of relevance to SERS applications. With arms radiating from a central core, gold nanostars represent a unique and fascinating class of nanomaterials from which extraordinary plasmonic properties are derived. Despite their relevance to sensing applications, methods for fabricating homogeneous populations of nanostars on large-area planar surfaces in truly periodic arrays is lacking. Herein, the f…

    Date Published:
    2020-07
    Record Visibility:
    Public
  • Author(s):
    S. Rouvimov, D. V. Nechaev, V. I. Kozlovsky, S. V. Ivanov
    Abstract:

    Spreading resistance microscopy (SRM) was used to study nanoscale variations in electronic and structural properties of an ultrathin near-surface GaN/AlN quantum well (QW). In the SRM images of the growth surface of the GaN/AlN QW heterostructure, an inhomogeneous current contrast was detected in the form of disk-like regions of increased conductivity with the sizes in the range of 50–160 nm and a density of 1.7 109 cm 2 . Analysis of the current contrast dependence on the polarity of the sam…

    Date Published:
    2019-02
    Record Visibility:
    Public
  • Author(s):
    Rui Zhao, Benjamin Grisafe, Ram Krishna Ghosh, Ke Wang, Suman Datta, Joshua Robinson
    Abstract:

    The 1T phase of tantalum disulfide (1T-TaS 2 ) possesses a variety of charge-density-wave (CDW) orders, and as a result, it attracts an increasing amount of academic and technological interest. The 1T phase of tantalum disulfide (1T-TaS 2 ) possesses a variety of charge-density-wave (CDW) orders, and as a result, it attracts an increasing amount of academic and technological interest. Researchers have devoted tremendous efforts towards understanding the impacts of doping, alloying, intercalat…

    Date Published:
    2019-04
    Record Visibility:
    Public
  • Author(s):
    Paul J. McGinn
    Abstract:

    High-throughput combinatorial investigations are transforming materials discovery, phase diagram development, and processing optimization. Thin-film deposition techniques are frequently used to fabricate sample libraries employed in these studies. Various adaptations of well-known thin-film chemical vapor deposition (CVD) and physical vapor deposition (PVD) techniques utilized for the synthesis of inorganic combinatorial thin-film materials libraries are reviewed, with novel processing approa…

    Date Published:
    2019-08
    Record Visibility:
    Public
  • Author(s):
    N Kryzhanovskaya, E. Moiseev, F. I. Zubov, A. M. Mozharov, M. V. Maximov, N. A. Kalyuzhnyy, S. A. Mintariov, Yu Bernikov, S. Rouvimov, A. E. Zhukov
    Abstract:

    GaAs-based microdisk lasers with an active region representing a dense array of indium-rich islands (InGaAs quantum well-dots) were studied using direct small-signal modulation. We demonstrate that using dense arrays of InGaAs quantum well-dots enables uncooled high-frequency applications with a GHz-range bandwidth for microdisk lasers. A maximum 3 dB modulation frequency of 5.9 GHz was found in the microdisk with a radius of 13.5 μm operating without a heatsink for cooling. A modulation curr…

    Date Published:
    2019-05
    Record Visibility:
    Public
  • Author(s):
    Eveline Rigo, Zhuxin Dong, Jae Hyun Park, Eamonn Kennedy, Mohammad Hokmabadi, Lisa Almonte-Garcia, Li Ding, Narayana Aluru, Gregory Timp
    Abstract:

    The size of an ion affects everything from the structure of water to life itself. In this report, to gauge their size, ions dissolved in water are forced electrically through a sub-nanometer- diameter pore spanning a thin membrane and the current is measured. The measurements reveal an ion-selective conductance that vanishes in poresThe size of an ion affects everything from the structure of water to life itself. In this report, to gauge their size, ions dissolved in water are forced electric…

    Date Published:
    2019-05
    Record Visibility:
    Public
  • Author(s):
    Gregory timp, Eamonn Kennedy, Zhuxin Dong, Clare Tennant
    Abstract:

    Disclosed are then inorganic membranes having a defined topography that includes pores having a defined diameter of nanometer and sub-nanometer diameter. The thin membranes are resistant to protein denaturing agents, and may be employed in analytical and clinical methods for identifying single amino acid residues within the sequence of a protein and the pores are other than NspA pores. Methods for making a thin inorganic membrane with nanopore and sub-nanopore topography and conical cone stru…

    Date Created:
    2019-02-28
    Record Visibility:
    Public
    Resource Type
    Document
  • Author(s):
    A. M. Mintairov, D. V. Lebedev, N. Bert, K. G. Belyaev, V. N. Nevedomskiy, M. V. Rakhlin, A. A. Toropov, A. S. Vlasov, A. Gocalinska, G. Juska, E. Pelucchi, M. A. Arrendondo, A. B. Naden, A. V. Shelaev, V. A. Bykov
    Abstract:

    We used transmission electron microscopy, Raman, and photoluminescence spectroscopy to identify the effect of CuPt-type GaP-InP atomic ordering (AO) on the structural and emission properties of self-organized (SO) InP/GaInP2 Wigner molecule (WM) quantum dot (QD) structures. We found that the correlation of AO and SO growth results in the formation of InP/GaInP2 QD/AO-domain (QD/AOD) core-shell composites. This observation shows that intrinsic WMs in this system emerge due to a strong piezoele…

    Date Published:
    2019-11
    Record Visibility:
    Public