石墨烯-聚合物基纳米复合材料的光热效应分析  

Analysis of photothermal effect for graphene/polymer nanocomposites

作　　者：祝剑斌 李芳 张海宇 刘记立 ZHU Jianbin;LI Fang;ZHANG Haiyu;LIU Jili(Department of and EngineeringStructure,Wuhan University of Technology,Wuhan 430070,China;Green&Smart River-Sea-Going Ship,Cruise and Yacht Research Center,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学理学院工程结构与力学系,武汉430070 [2]武汉理工大学绿色智能江海直达船舶与邮轮游艇研究中心,武汉430070

出　　处：《激光杂志》2021年第9期11-16,共6页Laser Journal

基　　金：国家自然科学基金(No.51974217,52002299);中央高校基本科研业务费专项资金资助(No.WUT:2019IA003,2018IB007)。

摘　　要：石墨烯作为一种优越的光热填充剂材料,其优异的近红外光吸收特性、光热转化性能,以及高比表面积和良好的热传导性能,与聚合物基体复合而形成了一类新型的光热转化智能复合材料,在光热治疗、光热驱动、微纳米机械等方面具有广阔的应用前景。然而,由于石墨烯填充浓度、光辐照光强等因素对光热转化过程中温度响应的影响并不清晰,成为制约该类复合材料实现实际应用的关键问题之一。为此,本文以能量平衡方程、朗伯比尔定律(Lambert-Beer law)以及牛顿冷却定律(Newton’s law of cooling)等理论为基础,分析其在近红外光辐照下的光热效应。探讨了石墨烯填充浓度、复合材料厚度以及光强等因素对复合材料光热转化过程中能量吸收、光热能量转化以及温度响应的影响,得到了光热转化达到饱和态时对应的复合材料厚度、石墨烯填充浓度等临界值,为石墨烯-聚合物基纳米复合材料的光热效应分析提供了理论方法,为其光热转化行为的调控及应用提供了理论基础。As a superior photothermal filler material,graphene has excellent near-infrared light absorption characteristics,photothermal conversion performance,high specific surface area and good thermal conductivity. It forms a new type of photothermal conversion intelligent composite materials by compounding with the polymer matrix. These graphene/polymer nanocomposites have broad application prospects in photothermal therapy,photothermal actuate,micro-nano machinery,etc. At present,although many researchers have tried to improve the photo thermal conversion ability by increasing the filling concentration of graphene and increasing the near-infrared irradiation light power and make the temperature of the composite rise rapidly in a shorter time. However,how to achieve precise control of the photothermal conversion performance for this type of nanocomposites has become the key to restricting its practical application. To this end,this paper introduced an analytical method to describe the photothermal effect under near-infrared light irradiation based on the energy balance equation,Lambert-Beer law and Newton’s law of cooling. The effects of graphene mass concentration,light path length and intensity on the energy absorption,photothermal energy conversion and change of temperature for graphene/polymer nanocomposites under near-infrared light irradiation were discussed. The mechanism that the photothermal conversion behavior slows down with the increase of graphene concentration and the linear influence mechanism of irradiation light intensity on photothermal conversion were explained. Especially,the critical values of graphene mass concentration and light path length corresponding to the saturated state of photothermal conversion were predicted. Therefore,the results obtained in this paper can provide a theoretical basis for the photothermal application of graphene/polymer nanocomposites.

关 键 词：石墨烯纳米片 聚合物基纳米复合材料 近红外光 光热能量转化 光热效应 

分 类 号：O551.3[理学—热学与物质分子运动论]