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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Tuning Charge Transport in Aromatic-Ring Single-Molecule Junctions via Ionic-Liquid Gating.

Na Xin1, Xingxing Li2, Chuancheng Jia1

  • 1Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.

Angewandte Chemie (International Ed. in English)
|September 15, 2018
PubMed
Summary

Researchers developed novel aromatic-ring molecular nanotransistors using an ionic-liquid gate. This breakthrough enables precise control over charge transport in single-molecule junctions, paving the way for advanced molecular electronics.

Keywords:
aromatic ringscharge transportgrapheneionic liquidssingle-molecule junction

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Achieving atomic-level gate control is essential for nanoscale transistor performance but remains a significant challenge.
  • Molecular nanotransistors offer potential for future electronic devices but require effective gate modulation.

Purpose of the Study:

  • To report a new class of aromatic-ring molecular nanotransistors.
  • To demonstrate effective gate control using an ionic-liquid gate in graphene-molecule-graphene junctions.
  • To achieve ambipolar charge transport in molecular systems with low gate voltage.

Main Methods:

  • Fabrication of single-molecule junctions using graphene-molecule-graphene structures.
  • Utilizing an ionic-liquid gate to modulate the molecular nanotransistors.
  • Conducting experimental measurements and theoretical calculations to analyze charge transport properties.

Main Results:

  • The ionic-liquid gate effectively modulates the alignment of molecular orbitals with graphene electrodes.
  • Charge-transport properties of the junctions are tuned by the gate voltage.
  • Ambipolar charge transport is achieved with a low gate voltage (|VG| ≤ 1.5 V) in electrochemically inactive molecular systems (EG > 3.5 eV).

Conclusions:

  • The developed ionic-liquid gating strategy provides a viable method for high-performance single-molecule transistors.
  • This approach enhances the prospects for creating molecularly engineered electronic devices.
  • Precise gate control at the molecular level is demonstrated, advancing the field of molecular electronics.