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Related Concept Videos

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
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Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
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Bonding in Metals02:32

Bonding in Metals

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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”. 
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Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Semi-metallic polymers.

Olga Bubnova1, Zia Ullah Khan1, Hui Wang1

  • 1Linkoping University, Department of Science and Technology, Organic Electronics, SE-601 74 Norrkoping, Sweden.

Nature Materials
|December 10, 2013
PubMed
Summary
This summary is machine-generated.

Researchers discovered that polymers can exhibit semi-metallic properties, offering new possibilities for advanced electronics. These novel polymer semi-metals show promise for thermoelectric and spintronic applications.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Polymer Science

Background:

  • Polymers are versatile materials with potential for low-cost printed electronics.
  • Previous research established polymers as insulators, semiconductors, or metals.
  • Semi-metals, characterized by a zero bandgap and low density of states at the Fermi level, are valuable for thermoelectrics.

Purpose of the Study:

  • To investigate the potential of polymers to exhibit semi-metallic properties.
  • To explore the thermoelectric properties of poly(3,4-ethylenedioxythiophene) (PEDOT) under varying molecular organization.
  • To assess the suitability of polymer semi-metals for thermoelectrics and spintronics.

Main Methods:

  • Synthesis and characterization of poly(3,4-ethylenedioxythiophene) samples.
  • Measurement of thermoelectric properties, including Seebeck coefficient and electrical conductivity.
  • Analysis of molecular organization's impact on electronic properties.

Main Results:

  • Demonstrated that polymers can be semi-metallic, a novel finding.
  • Observed a significant increase in the Seebeck coefficient with enhanced electrical conductivity in PEDOT.
  • Showcased the transition from a Fermi glass state to a semi-metallic state through molecular organization.

Conclusions:

  • Polymer semi-metals represent a new class of materials with unique electronic properties.
  • Enhanced molecular organization in polymers can induce semi-metallic behavior.
  • The high Seebeck coefficient, metallic conductivity, and absence of unpaired spins make these materials promising for thermoelectrics and spintronics.