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Showing 1–10 of 10 results
Advanced filters: Author: Jae-Pyoung Ahn Clear advanced filters

  • We report on the formation and rupture of CFs through Ag ion migration inside a single-crystalline 2D van der Waals (vdW) solid electrolyte material within an ECM device structure. This study provides clear experimental evidence that CFs consisting of Ag can be formed inside single-crystalline 2D layered chromium thiophosphate (CrPS4) and their configuration can be changed by an applied voltage. Density functional theory calculations confirm that the Ag ion migration is an energetically favorable process. The electrically induced changes in Ag CFs inside single-crystalline CrPS4 raise the possibility of a reliable ECM device that exploits the properties of two-dimensionally confined materials.

    • Mi Jung Lee
    • Sung-Hoon Kim
    • Bae Ho Park
    ResearchOpen Access
    NPG Asia Materials
    Volume: 12, P: 1-9

  • The extracellular matrix is remodeled to form complex interconnected network structures that regulate stem cell behaviors. Here, the authors modulate extracellular matrix-like networks using magnetic nano-blockers, adjusting stem cell behavior by changing ligand inter-cluster connectivity. This dynamic system provides new insights into cell-material interactions for tissue regeneration.

    • Chowon Kim
    • Nayeon Kang
    • Heemin Kang
    ResearchOpen Access
    Nature Communications
    Volume: 15, P: 1-22

  • We suggest synaptic devices using cation migration along thickness direction in a new class of 2D layered materials. An electrochemically active metal, such as Ag and Cu, is used for the operation of the synaptic device and chromium thiophosphate (CrPS4) single crystal is used as an electrolyte material. Multi-stable resistive states, short-term plasticity, and long-term potentiation are observed by controlling external voltage pulse with height smaller than 0.3 V. Given that simple mechanical exfoliation can generate very thin CrPS4 layers, the vertical Ag/CrPS4/Au capacitor offers a promising inorganic synaptic device compatible with next-generation flexible neuromorphic technology.

    • Mi Jung Lee
    • Sangik Lee
    • Bae Ho Park
    ResearchOpen Access
    NPG Asia Materials
    Volume: 10, P: 23-30

  • Cracking in thin films is usually associated with failure. Here, the authors use an electron beam to selectively irradiate a copper thin film on a polymer substrate and introduce designed cracks under tension to make a strain responsive organic light-emitting device (OLED).

    • So-Yeon Lee
    • Kyung Ryoul Park
    • In-Suk Choi
    ResearchOpen Access
    Nature Communications
    Volume: 10, P: 1-8

  • A metastable palladium hydride is synthesized where the unique environment in the liquid cell, namely the limited quantity of Pd precursors and the continuous supply of H, resulted in the formation of the hcp phase.

    • Jaeyoung Hong
    • Jee-Hwan Bae
    • Dong Won Chun
    Research
    Nature
    Volume: 603, P: 631-636

  • 3D-networked boron-doped diamond/carbon nanotube (BDD–CNT) core-shell nanowires were fabricated using the electrostatic self-assembly of nanodiamond. Although CNTs are easily etched out at their defect sites in hydrogen-rich environments, densely attached nanodiamond particles suppressed the etching of the CNTs and promoted BDD growth. After BDD deposition, 3D-networked BDD–CNT nanowires were successfully developed. In comparison to other electrodes, the BDD–CNT electrode exhibited better electrochemical performances, that is, low electron transfer resistance, large effective surface area and high sensitivity with significantly low detection range (8.7 mA mM−1 in the range 0.65–83.75 nM). The improvement in the performances of the BDD–CNT electrode could be attributed to the geometry and electron pathways offered by CNTs as well as to the synergistic material properties of BDD and CNT. The BDD–CNT electrode shows promise for application in the noninvasive measurement of glucose in living beings as well as for environmental monitoring in sea water.

    • Seung-Koo Lee
    • Min-Jung Song
    • Dae-Soon Lim
    ResearchOpen Access
    NPG Asia Materials
    Volume: 6, P: e115