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Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
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Towards graphyne molecular electronics.

Zhihai Li1, Manuel Smeu2, Arnaud Rives3

  • 1Department of Chemistry, Temple University, Philadelphia, Pennsylvania 19122, USA.

Nature Communications
|February 21, 2015
PubMed
Summary
This summary is machine-generated.

Single molecule conductance of carbo-benzene, a theoretical material, was measured. This carbo-graphene derivative shows high conductance, outperforming similar nanographenes and exhibiting field-effect transistor behavior for potential device applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Organic Electronics

Background:

  • α-Graphyne, a theoretical carbon-expanded graphene, is a zero-gap semiconductor.
  • Molecular units of α-graphyne can be synthesized and functionalized for molecular electronics.

Purpose of the Study:

  • To measure the single molecule conductance of carbo-benzene, a molecular unit of α-graphyne.
  • To investigate the electronic transport properties and potential device applications of carbo-benzene.

Main Methods:

  • Scanning tunneling microscopy (STM) break junction technique for electrical measurements.
  • First-principles electron transport calculations.
  • Synthesis of carbo-benzene molecular junctions with anilinyl anchoring groups on gold electrodes.

Main Results:

  • Unprecedented single molecule conductance of 106 nS for carbo-benzene at a 1.94-nm N-N distance.
  • Carbo-benzene conductance is approximately 10 times higher than a shorter hexabenzocoronene analogue.
  • A modified 'carbo-butadiene' molecule showed 40 times lower conductance.
  • Carbo-benzene junctions demonstrated field-effect transistor behavior with an electrochemical gate.

Conclusions:

  • Carbo-benzene exhibits exceptionally high single-molecule conductance, surpassing existing nanographenic materials.
  • Molecular structure significantly impacts conductance, with rigidity playing a key role.
  • Carbo-benzene's field-effect transistor behavior indicates potential for future electronic device applications.