Abstract
The advancement of flexible electronics demands improved components,necessitating heat dissipation membranes(HDMs)to exhibit high thermal conductivity while maintaining structural integrity and per-formance stability even after extensive deformation.Herein,we have devised a laser-modulated reduc-tion technique for graphene oxide(GO),enabling the fabrication of high-quality,large-scale,low-defect graphene,which yields high-performance HDMs after orderly deposition.The work underscores the crucial role of the laser wavelength and dispersion liquid's coupling intensity in influencing the mor-phology and properties of graphene.Optimal coupling effect and energy conversion are realized when a laser of 1064 nm wavelength irradiates a triethylene glycol(TEG)/N,N-Dimethylformamide(DMF)disper-sion.This unique synergy generates high transient energy,which facilitates the deprotonation process and ensures a swift,comprehensive GO reduction.In contrast to conventional water-based laser reduc-tion methods,the accelerated reaction magnifies the size of the graphene sheets by mitigating the abla-tion effect.After membrane construction with an ordered structure,the corresponding membrane exhibits a high thermal conductivity of 1632 W m-1 K-1,requiring only～1/10 of the total preparation time required by other reported methods.Remarkably,the resulting HDM demonstrates superior resili-ence against creasing and folding,maintaining excellent smoothness and negligible reduction in thermal conductivity after violent rubbing.The combination of exceptional flexibility and thermal conductivity in HDMs paves the way for long-term practical use in the flexible electronics industry.
基金项目
National Science Foundation of Jiangsu Province(BK20210861)
National Natural Science Foundation of China(62101374)
open research fund of Key Laboratory of MEMS of Ministry of Education,Southeast University()
NETL
NSTL
万方数据