Yayınlanmış 1 Ocak 2025 | Sürüm v1
Dergi makalesi Açık

Synthesis of intrinsically sodium intercalated ultra-thin layered MnO<sub>2</sub> and its ionic charge transport

  • 1. Bilkent Univ UNAM, Inst Mat Sci & Nanotechnol, TR-06800 Ankara, Turkiye
  • 2. Bilkent Univ, Dept Phys, TR-06800 Ankara, Turkiye

Açıklama

Ionic motion at the interlamellar space in layered materials can provide superior properties in electrochemical energy storage, neuromorphic computing, and ion-mediated charge transport. Herein, we demonstrate the synthesis of ultra-thin, single-crystalline MnO2 nanosheets intercalated with Na+ ions during molten-salt-assisted chemical vapor deposition. Unlike the post-intercalation of alkali ions into a host material, this method facilitates spontaneous Na+ intercalation during crystal formation, yielding highly ordered layered delta-MnO2 (birnessite-type phase) with structural stability. Our in-depth studies, including X-ray diffraction, Raman spectroscopy, and transmission electron microscopy, on the as-synthesized Na-MnO2 crystals elucidate the crystal properties and highlight that ambient moisture significantly affects the movement of ions and improves their electrochemical stability. Furthermore, we used two-terminal devices of Na-MnO2 crystals to show hysteretic behavior due to the ionic charge transport mechanisms, making them highly suitable for neuromorphic applications.

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