基于锌配位的石墨烯/偶氮苯光热材料  

Graphene/Azobenzene Photothermal Material Based on Zinc Coordination

作　　者：高文超 冯奕钰[1] 封伟[1] GAO Wenchao;FENG Yiyu;FENG Wei(School of Materials Science and Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《功能高分子学报》2022年第2期116-121,共6页Journal of Functional Polymers

基　　金：国家自然科学基金重点项目(51633007);国家自然科学基金面上项目(51973152)。

摘　　要：为了提高偶氮苯基复合材料的能量密度,通过锌离子(Zn^(2+))与接枝到还原氧化石墨烯上的4-硝基-4′-氨基偶氮苯(AGO)配位的方法,成功制备出了具有阴阳离子相互作用的石墨烯/偶氮苯复合材料(AGO/Zn)。研究表明,石墨烯模板上偶氮苯的光异构化和离子可逆相互作用的协同效果使材料能量密度大幅提高。在紫外光(365 nm)照射4 h后,AGO/Zn的能量密度达到最大值(504.2 J/g),约为AGO能量密度的1.69倍。Azobenzene has two configurations which are trans-configuration and cis-configuration.As a photo-isomerization molecule,azobenzene can transfer from trans-configuration in low energy state to cis-configuration in a high energy state under the irradiation of ultraviolet light(UV),which is the process of photo-isomerization.Herein,azobenzene and its derivatives are used in different industries and fields.However,due to their low energy density compared with other molecular solar thermal energy storage(MOST)like anthracene and norbornadiene,their applications in energy storage are influenced severely.The purpose of this paper is to find a method to solve the problem above.In this paper,4-nitro-4'-aminoazobenzene(Azo)was grafted onto reduced graphene oxide(rGO)by the coupling reaction and then interacted with ZnCl_(2) to get the azobenzene graphene composite with zinc ion interaction(AGO/Zn).There are two mechanisms of energy storage/release in this method,photoisomerization of azobenzene onto graphene template,and ion interaction formation/destruction,which is a unique attempt to improve energy density through multiple mechanisms of heat release.It has been proved that the nanoscale templates have a significant effect on improving the energy density of azobenzene derivatives.FT-IR spectroscopy show that AGO/Zn is successfully prepared by this method.Moreover,the maximum energy density of that is up to 504.2 J/g under the irradiation of UV(365 nm)for 4 h,which is about 1.69 times of the azobenzene graphene composite(AGO)without ion interaction.Results show that the introduction of zinc and graphene templates greatly improves the energy density of azobenzene,which provides a reference for the development and application of azobenzene composites with multiple mechanisms of energy storage in the future.

关 键 词：石墨烯/偶氮苯 能量密度 锌离子 

分 类 号：O625.64[理学—有机化学]