A kind of pedot film with high film thickness and high conductivity and preparation method thereof

Abstract

The invention relates to a high-thickness and high-conductivity PEDOT film and a preparation method thereof. The PEDOT film containing PEDOT:X is prepared from an EDOT monomer as a raw material and a weak basic anion-containing high-alcohol-solubility ferric salt FeX<3> as an oxidizing agent by adopting a gas phase method or a solution method, wherein X is high-alcohol-solubility weak basic anions, preferably, at least one of camphosulfonate ions, long-chain alkylbenzene sulfonate ions, alkyl naphthalene sulfonate ions, dialkyl naphthalene sulfonate ions and dinonyl naphthalene disulfonate ions. According to the film and the preparation method thereof, by utilizing high alcohol solubility of a ferric salt oxidizing agent solution of a precursor, the concentration and viscosity of a spin-coating solution are improved, the crystallization of the oxidizing agent in a reaction process is inhibited, and copolymer anti-crystallization inhibitors (pyridine, PEPG and the like) do not need to be added, so that a high-thickness PEDOT film is obtained.

Description

technical field [0001] The invention belongs to the field of energy materials, and specifically relates to a PEDOT film with high film thickness and high conductivity and a preparation method thereof. The product has high film thickness and high conductivity, optimizes the traditional process, and better meets the application requirements. Background technique [0002] Conductive polymer materials have better ductility, processability and lower cost than traditional inorganic bulk materials. Poly-3,4-ethylenedioxythiophene (PEDOT) is currently the most excellent conductive polymer thermoelectric material. , PSS-doped PEDOT is most commonly used due to its high conductivity and commercial production. The highest ZT value of the PEDOT film prepared by Kim et al. reached 0.42 (Nat Mater, 2013, 12, 719). In addition, the small molecule doped PEDOT prepared by solution method, gas phase method and electrochemical polymerization, such as PEDOT:Tos, has a more compact and regular s...

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Problems solved by technology

[0005] The second shortcoming lies in FeTos 3 and FeOtf 3 And other traditional oxidants also have the following two unstable characteristics, which limit their application: First, due to FeTos 3 and FeOtf 3 The middle anions are all strong acid ions, and the pH value of the solution is higher, which accelerates the reaction speed. Too fast reaction speed leads to the formation of structural defects and reduces the thermoelectric performance. Therefore, it is necessary to add alkaline inhibitors such as pyridine to improve the solution. pH, slows down the reaction speed, pyridine is highly toxic to humans, and its volatilization causes environmental pollution

Secondly, due to the low solubility, it is easy to crystallize and precipitate when the reaction is heated, forming defects in the film, which is not conducive to the transport of carriers, so it is necessary to add additional copolymers to inhibit crystallization, such as polyethylene glycol-propylene glycol-ethylene glycol Diol terpolymer (PEPG), the incorporation of PEPG introduces a non-conductive second phase in PEDOT, reducing the uniformity and conductivity of the film

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