Abstract
Flexible,lightweight,robust and versatile properties are essential for the next generation of wearable as well as intelligent electromagnetic interference(EMI)shielding materials.In this work,multilayered films containing cellulose nanofiber(CNF)layers,CNF/MXene layers,and CNF/silver nanowires(CNF/AgNWs)layers were fabricated by an efficient and easy-to-use vacuum filtration method.Compared with a uni-formly mixed film,the resultant layered composite films that loaded with a low MXene and AgNWs content exhibit superior mechanical properties with a tensile strength of 137 MPa,a strain at break of 5.7％,excellent EMI shielding effectiveness(EMI SE)of 61.9 dB,and higher EMI SE/t of 20,653 dB cm-1.This is attributed to the high-performance CNF substrate,the highly efficient layered structures,and ex-tensive hydrogen-bonding interactions.In particular,a high degree of ohmic loss of multiple interfaces and polarization relaxation of local defects,as well as an abundance of terminal groups,favor the loss of electromagnetic waves(EMW)within the material.In addition,the prepared multifunctional layered composite films also show good antibacterial properties.As a result,the obtained new kind of flexible layered structure EMI shielding composite films with excellent EMI shielding performance,and mechan-ical properties present promising application prospects in the fields of EMI shielding and protection for aerospace,portable,and wearable flexible electronic devices.
基金项目
国家自然科学基金(51773167)
国家自然科学基金(52102303)
国家自然科学基金(52103095)
中国博士后科学基金(2019M650268)
Opening Project of State Key Laboratory of Polymer Materials Engineering(Sichuan University)(sklpme2021-05-09)
Foundation of Education Department of Shaanxi Province(20JK0805)
NETL
NSTL
万方数据