“One stone,two birds”solvent system to fabricate microcrystalline cellulose–Ti_(3)C_(2)T_(x)nanocomposite film as a flexible dielectric and thermally conductive material  

作　　者：Yong-Zhu Yan Shuwei Li Sung Soo Park Wei-Jin Zhang Jun Seok Lee Jung Rae Kim Dong Gi Seong Chang-Sik Ha 

机构地区：[1]Department of Polymer Science and Engineering,School of Chemical Engineering,Pusan National University,Busan 46241,Republic of Korea [2]School of Chemical and Biomolecular Engineering,Pusan National University,Busan 46241,Republic of Korea [3]Division of Advanced Materials Engineering,Dong-Eui University,Busan 47340,Republic of Korea

出　　处：《Nano Research》2023年第2期3240-3253,共14页纳米研究（英文版）

基　　金：supported by the National Research Foundation of Korea(NRF)Grant funded by the Ministry of Science and ICT,Korea(NRF-2021R1I1A3060098,NRF-2021R1I1A3059777);supported by the Brain Korea 21 Plus Program(4199990414196);the Korea Institute for Advancement of Technology funded by the Ministry of Trade,Industry and Energy(P0017531);Y.Z.Y.was partially supported by the China Scholarship Council(No.201908260073).

摘　　要：A strategy for fabricating microcrystalline cellulose–Ti_(3)C_(2)T_(x)(MCC–MXene)nanocomposite films with high relative permittivity,high thermal conductivity,and excellent mechanical properties was developed.The MCC–MXene nanocomposite film was fabricated by casting a solution containing N,N-dimethylacetamide/lithium chloride(DMAc/LiCl)-soluble MCC and DMAcdispersible MXene nanosheets,followed by humidity control drying.The MXene nanosheets greatly enhanced the permittivity of the nanocomposite films owing to interfacial polarization.Thus,the nanocomposite film with 20 wt.%MXene content achieved a desirable permittivity of 71.4 at 102 Hz(a 770%improvement against that of neat cellulose),while the dielectric loss only increased by 1.8 times(from 0.39 to 0.70).The obtained nanocomposite films with 20 wt.%and 30 wt.%MXene exhibited remarkable in-plane thermal conductivities of 8.523 and 9.668 W∙m^(−1)∙K^(−1),respectively,owing to the uniform dispersion and selfalignment of the MXene layered structure.Additionally,the uniformly dispersed MXene nanosheets in the MCC network with interfacial interaction(hydrogen bonding)and mechanical entanglement endowed the nanocomposite films with excellent mechanical properties and flexibility.Furthermore,the thermal stability,water resistance,and antibacterial properties of the nanocomposite films were effectively improved with the introduction of MXene.Moreover,using DMAc/LiCl as the solvent system not only improves the compatibility between MCC and MXene but also avoids the problem of easy oxidation of MXene in aqueous systems.With the high stability of the MCC–MXene solution and enhanced properties of the MCC–MXene films,the proposed strategy manifests great potential for fabricating natural biomass-based dielectric materials.

关 键 词：Ti_(3)C_(2)T_(x) microcrystalline cellulose flexible dielectric thermally conductive N N-dimethylacetamide/lithium chloride(DMAc/LiCl) compatibility 

分 类 号：TB33[一般工业技术—材料科学与工程]