Carbon-Based Polymer Materials And Their Photothermal Conversion Performance

Due to good physical and chemical properties,the carbon-based polymer materials have been widely used in various fields such as photothermal conversion,thermal management,solar cells,and thermal actuators.In this thesis,a highly efficient photothermal conversion devices were based on CNTs and polypyrrole.It is used in solar-driven evaporation,SERS detection,photothermal assisted oil absorption,etc.The details are as follows:(1)Herein,an all-in-one solar driven evaporator has been developed by alternatively depositing carbon nanotubes(CNTs)films and gold nanoparticles films on flexible cotton fabric surface for solar driven both pollution detection and water collection.Based on the facile and robust interfacial self-assembly strategy,a large-area CNTs film at air/water interface and closely-packed Au nanoparticles(AuNPs)film assembled at liquid/liquid interface was readily achieved,which could be further alternatively transferred onto cotton fabric surface for solar-to-thermal conversion applications.Owing to the favorable flexibility and foldability of the cotton fabric,the CNTs film modified cotton enabled the configurable transition from 2D flat structure to adjusted 3D wave-like structures for enhanced solar steam generation.Furthermore,when the AuNPs film was further deposited onto the surface of CNTs film for polluted water evaporation,the resulted CNTs-loaded Au hybrid could realize an effective pollutant detection through surface enhanced Raman scattering(SERS)signals.(2)A biomass-derived sponge from discarded pomelo peel(PP)was discussed in this paper.And it can be modified with photothermal polypyrrole in a cost-effective way with mild reaction.The photothermic sponge which is derived from this process can then be effectively employed to realize solar enhanced water evaporation and heavy crude oil removal.The polypyrrole-functionalized pomelo peel(FPyPP)can be attained by a mild,one-pot wet oxypolymerization method,resulting in over 95%absorption of sunlight and evaporation rates of about 1.22 kg/m~2 under the sun.Furthermore,the concentrated heat on the sponge surface can efficiently reduce the viscosity of heavy crude oil and thereby lead to an effective clean-up.This study aims to provide a low-cost,low-energy-consumption and eco-friendly approach to the acquisition of the multifunctional photothermic sponge by recycling the waste and demonstrating potential applications in tackling clean water generation and polluted water treatment.