Study On The Preparation And Properties Of Single-walled Carbon Tube Film-based Flexible Devices

In recent years,organic and organic/inorganic thermoelectric(TE)composites not only attract wide interests but also witness explosive developments.In sharp contrast with inorganic TE materials,they possess many advantages including solution-processability,light-in-weight and well source on earth,etc.However,the research of corresponding organic TE devices develops slowly,and there are many problems to be resolved.For example,the researchers cannot directly compare with the performance of TE devices in different literatures,owing to the difference of devices'assembly strategy,materials and dimensions of p-n films and applying temperature difference(?T)in literatures.For that reason,the article,which is from the perspectives of the assembly strategy of different devices and the optimization assembly mode,is to deeply research the flexible TE devices(modules)based on single walled carbon nanotube(SWCNT)material.The main research contents and results are as follows:1.First,we fabricated a whole single-walled carbon nanotube(SWCNT)film.Later,the film gained the structure with three p-n units by the way of two chemical agents doping on the SWCNT film respectively.Finally,the film was assembled by the folding approach,achieving an integrative flexible folding device.The results show that(i)p/n dopant can be successfully combined into SWCNT,and the performance of the SWCNT film was also changed;(ii)excessive dopants cannot increase the TE properties of the composite due to overmuch dopant coating on the composite film;and(iii)folding TE module can generate the output power of 243 nW at 50 K.2.we fabricated other two TE modules(serial and stacking)adopting the same materials with the folding module.Moreover,two modules compared with folding one.The results show that the TE properties of the three modules are in accordance with the following rules:serial type is better than folding type,folding type is better than stacking type.And we put forward to an assessment method of the flexible TE module performance(FDP),that is,FDP=Pmax/m?TN,where Pmax,m and N stand for the maximal output power,the mass of module and the number of p-n units.Later,by calculating FDP of three modules,the result demonstrates serial module(FDP=11.13 nW g-1 K-1)is greater than others3.Adopting the above serial strategy,we then fabricated a novel annular flexible TE device with integrated-module architecture by changing the dimensions and pairs of p-n units.In addition,the device was compared with traditional annular TE device with a single thin film.The result demonstrates the output power of TE device with integrated-module architecture(12.37 ?W)is superior to that of literatures and conventional annular device(1.74 ?W)at 18±2K.