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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
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A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
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Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Single-Molecule F&#246;rster Resonance Energy Transfer Methods for Real-Time Investigation of the Holliday Junction Resolution by GEN1
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Orientation-controlled single-molecule junctions.

Sepideh Afsari1, Zhihai Li, Eric Borguet

  • 1Department of Chemistry, Temple University, Philadelphia, PA 19122 (USA) http://www.temple.edu/borguet/

Angewandte Chemie (International Ed. in English)
|July 22, 2014
PubMed
Summary
This summary is machine-generated.

Researchers measured the electrical conductivity of a single aromatic ring using advanced scanning tunneling microscopy techniques. This new method achieved higher conductivity by creating ordered molecular structures for direct tip/π contacts.

Keywords:
benzene derivativesmesitylenemolecular electronicsself-assemblysingle-molecule conductivity

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Determining the intrinsic conductivity of single molecules is crucial for molecular electronics.
  • Conventional methods often struggle with precise control over molecular orientation and contact formation.
  • Aromatic rings are fundamental building blocks in organic materials and molecular devices.

Purpose of the Study:

  • To develop a novel strategy for measuring the conductivity of a single aromatic ring perpendicular to its plane.
  • To investigate the role of molecular assembly and orientation in electrical transport.
  • To establish a reliable method for creating and probing π-conjugated molecular junctions.

Main Methods:

  • Utilized a combination of molecular assembly, scanning tunneling microscopy (STM) imaging, and STM break junction (STM-BJ) techniques.
  • Fabricated highly ordered structures of flat-oriented mesitylene molecules on a Au(111) surface.
  • Achieved direct tip/π contacts for electrical measurements under ambient conditions and room temperature.

Main Results:

  • Successfully measured the conductance of an individual aromatic ring (mesitylene) in a Au/π/Au junction.
  • Obtained a conductance value of approximately 0.1 G(o), which is two orders of magnitude higher than previously reported for phenyl rings with standard anchoring groups.
  • Demonstrated that well-ordered, flat-oriented molecular structures significantly enhance the probability of forming orientation-controlled molecular junctions.

Conclusions:

  • The study presents a new, effective strategy for measuring single aromatic ring conductivity.
  • Highly ordered molecular assemblies are essential for achieving efficient electrical contact and high conductance in molecular junctions.
  • The findings pave the way for designing and fabricating advanced molecular electronic devices with enhanced performance.