| With the increase of demand of human for energy,the traditional fossil energy,because of its limited output and irrefragable that can not meet the requirements of the future society for energy,so the development and effective utilization of new energy is necessary in the future.As a new kind of energy material,thermoelectric materials can transform the waste heat in daily life into the electric energy that can be used directly,thus it have been receiving a lot of attention.Organic/inorganic composite thermoelectric material is an important thermoelectric material,which has aroused great interest in recent years.In this paper,two kinds of organic/inorganic composite thermoelectric materials were studied,Poly（3,4-ethylenedioxythiophene）:poly（styrenesulfonate）（PEDOT:PSS）/stannous sulfide nanobelt（SnS）nanobelt and single-walled carbon nanotubes（SWCNT）treated with quaternary ammonium salt.The main contents are as follows:1.A high performance p-type flexible film thermoelectric composites was prepared by the Sn S nanobelt blend with high Seebeck coefficient and high conductivity PEDOT:PSS.Firstly,SnS nanobelt with high purity,high crystallinity and high aspect ratio inorganic thermoelectric materials is prepared by hydrothermal method under high temperature and high pressure conditions.Then,the Sn S nanobelt and a certain amount of PEDOT:PSS were mixed by ultrasonic in the organic solvent DMF or EtOH,and the thin film thermoelectric materials were obtained by filtering uniformly dispersed liquid.The thermoelectric performance test shows the content of SnS nanobelt and the type of dispersive solvent influence the thermoelectric properties of composite materials.The thermoelectric properties of the composites prepared in DMF were better,and the maximum power factor was27.8±0.5μW m-1 K-2.By SEM,XRD methods to characterize morphology and structure of SnS nanobelts and its composite materials,Raman,ultraviolet visible near infrared test and analysis of the further study the principle of increasing PEDOT:PSS conductivity.On the basis of the above research,the mechanism of relationship the structure and thermoelectric properties of the composite flexible film are discussed.2.n-type thermoelectric materials were prepared by CTAB and other quaternary ammonium salt molecules doping single-wall carbon nanotubes.The n-type thin film thermoelectric materials were prepared by mixing quaternary ammonium salt and single-walled carbon nanotubes with different mass ratios in the solvent of water（H2O）,N,N-dimethyl formamide（DMF）and petroleum ether（PE）and and filtration.By testing the thermoelectric properties of thin film materials,the result shows that CTAB doped SWCNT films prepared in DMF have the maximum power factor 185.73±8.5μW m-1 K-2.SEM,XRD,EDS,Raman and XPS,this a series of characterization methods be utilized for analying the morphology,structure and composition of the materials;The influence of the different solvents,different alkyl chain length of quaternary ammonium salt and anionic type of quaternary ammonium salt for thermoelectric performance of the n-type thermoelectric materials have been discussed in detail and made reasonable explanation;The doped n-type carbon nanotubes and undoped p-type carbon nanotubes were assembled into flexible devices to realize the conversion of heat and electricity.The output voltage and output power of the device is tested,The maximum output power of the thermoelectric device at the temperature difference of 80K is 6.7μW. |
