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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
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Li-Ion Intercalation, Rectification, and Solid Electrolyte Interphase in Molecular Tunnel Junctions.

Hungu Kang1, Soo Jin Cho1, Gyu Don Kong1

  • 1Department of Chemistry, Korea University, Seoul, 02841, Korea.

Nano Letters
|June 6, 2022
PubMed
Summary
This summary is machine-generated.

Lithium-ion intercalation into self-assembled monolayers (SAMs) enhances molecular junction tunneling. However, solid electrolyte interphase formation at high concentrations disrupts rectification, impacting molecular electronics and battery research.

Keywords:
Li-ion intercalationmolecular junctionsrectificationsolid electrolyte interphase (SEI)tunneling

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Area of Science:

  • Molecular Electronics
  • Materials Science
  • Electrochemistry

Background:

  • Self-assembled monolayers (SAMs) on gold surfaces are crucial for molecular junctions.
  • Graphite anodes in lithium-ion batteries utilize intercalation mechanisms.
  • Understanding ion transport in molecular systems is key for advanced electronic devices.

Purpose of the Study:

  • To investigate lithium-ion (Li-ion) intercalation into pyrenyl-terminated SAMs.
  • To determine the effect of Li-ion intercalation on the tunneling performance of molecular junctions.
  • To explore the role of the solid electrolyte interphase (SEI) in modulating electronic properties.

Main Methods:

  • Fabrication of molecular junctions with pyrenyl-terminated SAMs on gold.
  • Controlled exposure to varying concentrations of LiPF6 precursor solutions.
  • Measurement of electrical transport properties, specifically rectification ratio.
  • Surface analysis to characterize SEI formation (e.g., LiF composition).

Main Results:

  • Li-ion intercalation increased the rectification ratio to approximately 10^2 at 10^-2 M LiPF6.
  • Intercalation induced changes in PYR group orientation and HOMO energy levels, enhancing rectification.
  • High LiPF6 concentrations (10^-2 to 10^0 M) formed a LiF-rich SEI layer.
  • The SEI layer caused the disappearance of rectification by renormalizing the HOMO level.

Conclusions:

  • Li-ion intercalation and SEI formation significantly influence tunneling transport in molecular junctions.
  • The study highlights the interplay between ion intercalation, SEI, and electronic properties in SAM-based systems.
  • Findings benefit the development of molecular electronics and SAM-based energy storage devices.