| Thermoelectric materials are based on the thermoelectric effect and can be used to prepare devices that directly convert heat and electric energy,and require high thermoelectric conversion efficiency.Traditional thermoelectric materials are inorganic thermoelectric materials with high thermoelectric conversion efficiency.Corresponding products have been launched in the fields of mobile phones,automobiles,and aviation.However,inorganic thermoelectric materials have complicated manufacturing processes,most of which require high temperature and high pressure,and the cost of manufacturing raw materials is high.The raw materials are mostly precious metals,and the processability is poor,and there is a lack of flexibility.People began to pay attention to organic thermoelectric materials.Among them,poly（3,4-ethylenedioxythiophene）:polystyrene sulfonic acid（PEDOT:PSS）is one of the most studied organic thermoelectric materials with the greatest potential.Its preparation process Simple,easy to obtain raw materials,strong processability,flexibility and high light transmittance,and a wide range of applications.However,due to its thermoelectric conversion efficiency,it has not yet reached the application requirements.The composite of inorganic nanomaterials is one of the important ways to improve the thermoelectric performance of PEDOT:PSS.A good composite can give play to the advantages of multiple materials and avoid the defects of a single material.Therefore,this paper chooses nano silver wires and graphene nanomaterials to improve the performance of PEDOT:PSS flexible thermoelectric film,and prepares the corresponding PEDOT:PSS composite thermoelectric textile.The results are as follows:（1）First,PEDOT:PSS is prepared by chemical oxidation polymerization method,and the film is coated on polyethylene terephthalate（PET）by bar coating method.By changing the amount of PSS,it is found that PEDOT is obtained when m PEDOT:m PSS=1:2.5.The PSS film has the highest thermoelectric efficiency,and the highest power factor is 1.2×10-2μW/（m?K~2）.It is determined that the packaging process can effectively improve the adhesion and bending resistance of the film,and the composite film has a higher light transmittance.（2）The polyol method is used to prepare silver nanowires（AgNWs）.The structure of the product was analyzed by scanning electron microscopy and ultraviolet spectroscopy.The diameter of AgNWs is about 60nm and the length is about 10μm.The AgNWs composite PEDOT:PSS film was prepared on the PET substrate by dipping and pulling method and bar coating method.In the film obtained by the dipping and pulling method,the arrangement of silver nanowires has directionality,which improves the overall conductivity of the film.When the amount of thickener is 4wt%,the pulling speed is 6cm/min,and the amount of AgNWs is 15wt%,the highest composite film is obtained.The power factor is 5.4×10-1μW/（m?K~2）.（3）The edge of the graphite is oxidized by potassium permanganate and concentrated sulfuric acid,and the mixed solution of hydrogen peroxide and ammonia is added to peel off the edge oxidized graphite to obtain edge graphene oxide（EGO）.It is modified by ethylenediamine to obtain amino-edge-modified graphene（NEGO）.It was mixed with PEDOT:PSS aqueous dispersion to prepare PET-based NEGO/PEDOT:PSS transparent thermoelectric film.When the NEGO doping amount is 3wt%,the obtained film has the highest thermoelectric efficiency,the transmittance is higher than 80%,and the power factor reaches the highest 9.9×10-1μW/（m·K~2）.（4）The AgNWs/PEDOT:PSS and NEGO/PEDOT:PSS composite thermoelectric textiles were prepared by impregnation on the cotton fabric,and the power factors were 0.18μW/（m·K~2）and 0.11μW/（m·K~2）respectively.The performance of the sample was tested,and the results showed that the thermoelectric textile obtained had good mechanical properties and thermal stability.The thermoelectric wristband used at room temperature was prepared,and when the temperature difference was 20°C,the thermoelectric potential was 0.03V. |
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