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Bonding in Metals02:32

Bonding in Metals

Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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Biasing of Metal-Semiconductor Junctions01:27

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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

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Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...

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Resonant Field Emission from Noble-Metal/Graphene Heterostructures.

Maxim Trushin1,2

  • 1Institute for Functional Intelligent Materials, National University of Singapore, 4 Science Drive 2, Singapore 117544, Singapore.

Nano Letters
|March 13, 2026
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Noble metals coated with graphene display tunable electron transport via resonant tunneling. This breakthrough enables novel applications in air-channel field-emission nanoelectronics.

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air-channel field emissiongraphenemetallic heterostructures

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanoelectronics

Background:

  • Field emission from metals was crucial for early vacuum tubes.
  • Nanoscale engineering integrated field-emission devices with silicon platforms.
  • Limited tunability of electron transport in metals hindered broader applications.

Purpose of the Study:

  • To investigate tunable electron transport in metal-graphene heterostructures.
  • To explore resonant tunneling phenomena in noble metal-graphene systems.
  • To develop novel components for air-channel field-emission nanoelectronics.

Main Methods:

  • Coating noble metals with graphene to modify electron transport properties.
  • Utilizing ab initio interface parameters and the Schrödinger equation for electron transmission analysis.
  • Analyzing vertical and coplanar device geometries for field enhancement and gating.

Main Results:

  • Observed clean, nonmonotonic current-voltage (I-V) characteristics.
  • Demonstrated resonant tunneling through graphene's electronic states.
  • Achieved tunable electron transport due to graphene's atomic thinness and weak hybridization.

Conclusions:

  • Established a practical method for tunable electron transport in metal heterostructures.
  • Positioned these novel structures as competitive components for nanoelectronics.
  • Opened new avenues for advanced field-emission devices.