Graphene improve the conductivity of PEDOT/PSS

Poly(3,4-ethylenedioxythiophene) /poly(styrenesulfonate)(PEDOT/PSS) is an aqueous solution of high molecular polymer, CAS number 155090-83-8, with high transparency, good flexibility and Excellent thermal stability, widely used in sensors, organic solar cells, transistors, electrochromic materials and other fields.

The modification of PEDOT/PSS composite materials has become the focus of research at home and abroad in recent years. Composite with graphene is an important method to improve the conductivity of PEDOT/PSS.

Graphene has good optical properties and thermal conductivity. Unlike other materials, the electron mobility of graphene is less affected by temperature changes, and it has high strength and good toughness. The introduction of graphene can form a strong π-π interaction with PEDOT, provide a conductive channel, and at the same time reduce the energy barrier of charge transfer on the PEDOT chain, so as to obtain a conductive composite material with high conductivity and good processability.

C. S. Pathak etc. ^[1] studied the preparation of PEDOT/PSS/graphene nanocomposite film. When graphene with a mass fraction of 0.47% is added to the PEDOT/PSS solution, the prepared nanocomposite has an excellent conductivity of 60S/cm and a high degree of transparency in the visible light region. Compared with the pure PEDOT/PSS film, the conductivity of the nanocomposite film has increased by two orders of magnitude, and the resistivity of the PEDOT/PSS/graphene nanocomposite film decreases as the temperature rises, which has the characteristic behavior of a semiconductor. In the PEDOT/PSS solution, the well-dispersed graphene sheets formed a better conductive path in the nanocomposite film, and at the same time reduced the energy barrier of charge transport on the PEDOT chain.

In summary, the composite of graphene nanomaterials and PEDOT/PSS can effectively modify the material, so that it has broader application prospects in solar cells, supercapacitors, organic thermoelectric devices and other fields.

references:

[1]Pathak CS, et al. Chemical Physics Letters, 2018, 694:75–81.