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  • Author(s):
    Seog Joon Yoon, Rizwan Khan, Junkhyun Lee, Jin Ho Bang
    Abstract:

    ABSTRACT: Despite the successful launch of Au nanoclusters (NCs) in light energy conversion applications, the utilization of Ag NCs has been limited by their instability under continuous illumination. The main cause of photoinduced degradation pathways remains elusive. Hence, understanding the underlying mechanism behind the low stability is an urgent task to provide a new impetus for the development of Ag NCs. The slow regeneration of Ag NCs by a redox couple leads to holes in the NCs, which…

    Date Published:
    2019-05
  • 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:
    2019-09-26
    Resource Type
    Document
  • Author(s):
    Zhe Cheng, Yee Rui Koh, Habib Ahmad, Rejiu Hu, Jingjing Shi, Michael Liao, Yekan Wang, Tingyu Bai, Ruiyang Li, Eungkyu Lee, Evan Clinton, Christopher Matthews, Zachary Engel, Luke Yates, Tengfei Luo, Mark Goorsky, William Doolittle, Zhiting Tian, Patrick Hopkins, Samuel Graham
    Abstract:

    A unified fundamental understanding of interfacial thermal transport is missing due to the complicated nature of interfaces which involves complex factors such as interfacial bonding and mixing, surface chemistry, crystal orientation, roughness, and interfacial disorder. This is especially true for metal-nonmetal interfaces which incorporate multiple fundamental heat transport mechanisms such as elastic and inelastic phonon scattering as well as electron-phonon coupling in the metal and acros…

    Date Published:
    2019-09
  • Author(s):
    Zhe Cheng, Yee Rui Koh, Habib Ahmad, Rejiu Hu, Jingjing Shi, Michael Liao, Yekan Wang, Tingyu Bai, Ruiyang Li, Eungkyu Lee, Evan Clinton, Christopher Matthews, Zachary Engel, Luke Yates, Tengfei Luo, Mark Goorsky, William Doolittle, Zhiting Tian, Patrick Hopkins, Samuel Graham
    Abstract:

    A unified fundamental understanding of interfacial thermal transport is missing due to the complicated nature of interfaces which involves complex factors such as interfacial bonding and mixing, surface chemistry, crystal orientation, roughness, and interfacial disorder. This is especially true for metal-nonmetal interfaces which incorporate multiple fundamental heat transport mechanisms such as elastic and inelastic phonon scattering as well as electron-phonon coupling in the metal and acros…

    Date Published:
    2019-09
  • Author(s):
    Khachatur Manukyan
    Abstract:

    Cerium oxide (CeO2) is of great interest due to its unique properties. The formation of a single oxygen-vacancy during the reduction of CeO2 to Ce2O3 increases the Ce3+ fraction [1,2,3]. The valence and defect structures of CeO2 are dynamic and can change spontaneously or in response to physical parameters such as temperature, partial oxygen pressure, doping with other ions, and on applying an electric field or surface stress. Nano-scale CeO2 particles possess an increased Ce3+ concentration …

    Date Published:
    2019-08
  • Author(s):
    Min Wang, Zulei Zhang, Lei Li, X. Cao
    Abstract:

    The nanocomposite preparation procedure plays an important role in achieving a well-established heterostructured junction, and hence, an optimized photocatalytic activity. In this study, a series of g-C3N4/ZnO nanocomposites were prepared through two distinct procedures of a low-cost, environmentally-friendly, in-situ fabrication process, with urea and zinc acetate being the only precursor materials. The physicochemical properties of synthesized g-C3N4/ZnO composites were mainly characterized…

    Date Published:
    2019-02
  • Author(s):
    Man Yang, Wei Lu, Renxi Jin, Xian-Chun Liu, Shuyan Song, Yan Xing
    Abstract:

    In this work, ZIF-67 is self-grown on the NiCo layered double hydroxide (NiCo-LDH) nanosheets-modified Ni foam (NF) surface. Its derivative, the hierarchically structured Co3O4/NiCo2O4/Ni foam (CO/NCO/NF) composite, is successfully fabricated by the oxidation of ZIF-67/NiCo-LDH/ NF, which exhibits excellent electrocatalytic performance. When assessed as an electrode for oxygen evolution reaction (OER), the CO/NCO/NF electrode shows low overpotentials of 320 and 407 mV at 10 and 50 mA cm−2, re…

    Date Published:
    2019-06
  • Author(s):
    Paolo Paletti, Ruoyu Yue, Christopher Hinkle, Susan Fullerton-Shirey, Alan Seabaugh
    Abstract:

    Two-dimensional van der Waals materials offer unique advantages for the development of band-to-band tunneling devices given their lack of dangling bonds, atomically flat thickness and steep band edges. Here, we present the experimental demonstration of an electric double layer (EDL) Esaki junction in synthetic WSe2 thin films. A Si-compatible process is developed for the fabrication of nanoscale FETs utilizing molecular beam epitaxy of WSe2 performed directly on top of a high-κ dielectric at ba…

    Date Published:
    2019-04
  • Author(s):
    Kazuki Nomoto, Aditya Sundar, Kevin Lee, Mingda Zhu, Zongyang Hu, Edward Beam, Jinqiao Xie, Manyam Pilla, Xiang Gao, Sergei Rouvimov, Debdeep Jena, Huili Grace Xing
    Abstract:

    GaN PolarMOS is a vertical power transistor incorporating the unique polarization-induced bulk doping scheme in III-nitrides for the body p-n junction. We report the realization of this device, wherein the vertical channel, source contact, and body contact regions are successfully formed using three steps of selective-area epitaxial regrowth, all by molecular beam epitaxy (MBE). The fabricated PolarMOS has an excellent on-current of >500 mA mm−1 and a specific on-resistance of 0.66 mΩ · cm…

    Date Published:
    2019-05
  • Author(s):
    Tor Elmelund, Rebecca Scheidt, Brian Seger, Prashant Kamat
    Abstract:

    MAPbBr3 and MAPbI3 films cast onto glass slides and physically paired together undergo halide exchange to form mixed halide films. The change in halide composition in these two ∼130 nm thick films occurs concurrently with Br− diffusing toward the MAPbI3 film and I− diffusing toward the MAPbBr3 film. The diffusion of these halide species, which is tracked through changes in the absorption, offers a direct measurement of thermally activated halide diffusion in perovskite films. The increase in …

    Date Published:
    2019-06
  • Author(s):
    Zhuxin Dong, Jae Hyde 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 pores <0.24 nm in diameter—the size of a water molecule—indicating that permeating ions have a grossly distorted hydration shell. Analysis of the current noise powe…

    Date Published:
    2019-05
  • Author(s):
    D. E. Sviridov, V. N. Jmerik, 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:
    2019-05