Conducting polymers by ankit gupta

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Conducting polymers by ankit gupta

  1. 1. Polyacetylene
  2. 2.  Organic polymers that conduct electricity are called conducting polymers. Such compounds may have metallic conductivity or can be semiconductors. The biggest advantage of conductive polymers is their processability, mainly by dispersion.
  3. 3.  In 1970 H.shirakawa reported high molecular weight polyacetylene film by passing dry acetylene gas over Ziegler- Natta catalyst of titanium tetrabutoxide triethyl aluminium in toluene at -78℃ . It was obtained on the surface of the catalyst. And also in the two forms known as cis and trans .
  4. 4. (1) Is cis polyacetylene.(2) Is trans polyacetylene.
  5. 5. The role of a dopant is to either add or remove electrons to the polymer. It is of two kinds: (1) Oxidative or p-doping. (2) Reductive or n-doping.
  6. 6.  The oxidizing agents for P-doping are like iodine vapours,I₂ dissolved in CCl₄ , HBF₄, HClO₄ , Br₂..etc. (CH)n → (CH)n ⁺ I₃⁻ The conduction in this type of doping increases up to 10⁵ s/cm.
  7. 7.  The reducing agents for n-doping are like Na metal ,FeCl₂, lithium metal ,sodium naphthalide..etc. (CH)n → (CH)⁻ Na⁺ Negative charge resonates throughout the chain and transferred to neighbouring chains through Na⁺ during conduction.
  8. 8.  For making rechargeable batteries. Used as sensors for phenol , O₂..etc at low concentrations. For manufacture of transistors ,LEDs, lasers and solar cells. In telecommunication systems In the construction of photovoltaic cells.
  9. 9. Light-emitting diodesSolar cell Shield for computer screen against electromagnetic "smart" windows radiation

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