PEDOT:PSS

Product Specifications.

　　Solid content: 1.1~1.40%

　　Viscosity: < 200mPas

　　PH: 1.5~2.5

　　Sodium ion content: < 200 ppm

　　Conductivity: > 800 S/cm (5% DMSO)

　　Surface resistance: < 40 ohm/sq

　　Light transmittance: > 78.0 %

　　Haze: < 0.3%

　　Product main performance characteristics.

　　- After formulation it is suitable for coating on flexible substrates;

　　- After formulation, it is suitable for spraying, spin coating, slit coating, stick coating and other coating processes;

　　Product application areas.

　　- Composite transparent conductive film.

　　- All kinds of transparent electrodes

　　- Supercapacitor auxiliary electrode

　　- Medical biosensors

　　- Organic thermoelectric films

　　- Solid/semi-solid aluminum electrolytic capacitor electrolyte

　　Usage matters.

　　Pretreatment and preservation of PEDOT/PSS

　　- As with most polymer emulsion dispersions, it is difficult to redisperse PEDOT/PSS when it has become dry. It is recommended that the dispersion be filtered to remove residual gels or large particles that have dried out and are visible to the naked eye after long openings and frequent use. In general, a filter of about 15um can be used.

　　- Dried out particles in the solution can clog the filter. Therefore, syringes and filters should only be used once. In addition, PEDOT/PSS containers should only be opened when the required amount of dispersion is prepared. Pouring unused product back into the container for reuse should be avoided.

　　- Particle settling and semi-gelatinization may occur after a long period of closed storage. If the particle and particle surface roughness are not required, it can be used again by shaking well;

　　- Suitable placement conditions are 5~25℃ to avoid light, remember not to freeze.

　　Improvement of coating wettability.

　　- The fluid properties of PEDOT/PSS aqueous dispersions are similar to those of water, with high surface tension, and the quality of pretreatment of the substrate seriously affects the ability to disperse PEDOT/PSS uniformly on the substrate surface.

　　- The wettability of PEDOT/PSS can be significantly improved on various substrates including glass, TCO and PET films by surface activation such as plasma, UV/ozone or corona discharge.

　　- If severe wetting problems still occur, add up to 30 wt% by mass of isopropyl alcohol and a surfactant to improve wetting and coating properties.

　　Coating of PEDOT/PSS

　　- In the laboratory, the coating method of PEDOT/PSS can be referred to the general coating and ink testing process, which can be made into a continuous and uniform film by different tools, such as "GB/T 1727-1992 General Preparation Method of Paint Film".

　　- For uniformity surface flatness has high requirements, spin coating and spraying is the most suitable; equipment should be cleaned with water in time after coating to avoid liquid curing crust; especially for spraying operation, it is more suitable for continuous operation to prevent blocking the nozzle during intermittent.

　　Improved electrical conductivity

　　- PEDOT / PSS direct coating preparation of the coating, does not have the best conductivity, you need to add a variety of polar solvents to achieve, suitable conductivity enhancers are: DMSO, ethylene glycol, NMP, etc., the general addition of 5 ~ 8 wt%, the upper limit of the increase in conductivity according to different batches, grades PEDOT / PSS different, need to experiment to determine.

　　Drying and curing of PEDOT/PSS

　　- After the coating of the substrate, the need for heating drying curing, the use of laboratory blast drying oven can be; drying temperature is generally set between 120 ~ 150 ℃, drying time of 2 ~ 15min.

　　Statement

　　- As the polymerization dispersion is not a solution, there are various types of instability; generally for the use of various additives, should be done now, unless through experiments to understand the stability of PEDOT / PSS to various additives.

　　Coating use matters.

　　- PEDOT/PSS coating has hygroscopic properties, so after the film is prepared, it needs to be placed in a non-humid environment.

　　- The film of PEDOT/PSS without additives is very fragile and has no adhesion to various substrates and will swell and peel when it meets water.

　　- This coating has not been tested for internal use on living organisms and is not guaranteed to be non-toxic.

　　- The surface resistance and light transmittance of the coating are sensitive to sunlight, oxidizing gas, alkaline gas and moisture, and long-term storage will cause the aging of the coating. Therefore, a dry and sealed environment should be chosen for the preservation of the coating, and experiments have confirmed that ordinary plastic bags can meet the medium and long-term (six months to one year) placement (resistance change <10%)

　　- The coating contains strong acidic poly (styrene sulfonate), in a complex atmospheric environment, when the coating surface is partially plated with metal contact electrodes, if no timely protection treatment is carried out, it will cause electrochemical corrosion of the metal surface after several weeks.