Chaobo Liang, Kunpeng Ruan, Yali Zhang and Junwei Gu*. Multifunctional Flexible Electromagnetic Interference Shielding Silver Nanowires/Cellulose Films with Excellent Thermal Management and Joule Heating Performances. ACS Applied Materials & Interfaces, 2020, 12(15): 18023-18031. 2018IF=8.456. （1區(qū)材料科學(xué)Top期刊）
https://doi.org/10.1021/acsami.0c04482
Abstract: Flexible electromagnetic interference (EMI) shielding materials with excellent thermal conductivities and Joule heating performances are of urgent demand in the communication industry, artificial intelligence, and wearable electronics. In this work, highly conductive silver nanowires (AgNWs) were prepared using the polyol method. Cellulose sheets were then prepared by dissolving natural cotton in a green and efficient NaOH/urea aqueous solution. Finally, multifunctional flexible EMI shielding AgNWs/cellulose films were fabricated based on vacuum-assisted filtration and hot-pressing. AgNWs are evenly embedded in the inner cellulose matrix and overlap with each other to form a 3D network. AgNWs/cellulose films, with a thickness of 44.5 μm, obtain the superior EMI shielding effectiveness of 101 dB, which is the highest value ever reported for shielding materials with the same thickness. In addition, AgNWs/cellulose films present excellent tensile strength (60.7 MPa) and tensile modulus (3.35 GPa), ultrahigh electrical conductivity (σ, 5571 S/cm), and excellent in-plane thermal conductivity coefficient (λ∥, 10.55 W/mK), which can effectively dissipate the heat accumulation. Interestingly, AgNWs/cellulose films also show outstanding Joule heating performances, good stability, and sensitive temperature response at driving voltages, absolutely safe for the human body. Therefore, our fabricated multifunctional flexible AgNWs/cellulose films have broad prospects in the fields of EMI shielding and protection of outdoor large-scale power transformers and wearable electronics.
通訊工業(yè)、人工智能和可穿戴電子產(chǎn)品領(lǐng)域亟需具有優(yōu)異導(dǎo)熱性能和焦耳熱性能的柔性電磁干擾（EMI）屏蔽材料。本文采用多元醇法制備高導(dǎo)電銀納米線（AgNWs），通過天然棉花溶解于綠色且高效的NaOH/尿素水溶液體系制備纖維素（cellulose）片，再經(jīng)真空輔助抽濾與熱壓相結(jié)合的方法制備多功能AgNWs/纖維素屏蔽膜。研究結(jié)果表明，AgNWs均勻地嵌在纖維素基體中，且相互搭接成三維網(wǎng)絡(luò)結(jié)構(gòu)。44.5 μm厚度的AgNWs/纖維素屏蔽膜具有101 dB的EMI SE，這是迄今報道過相同厚度下材料中的最高值。此外，AgNWs/纖維素屏蔽膜擁有卓越的拉伸強度（60.7 MPa）和拉伸模量（3.35 GPa），超高的導(dǎo)電率（s，5571 S/cm）和面內(nèi)導(dǎo)熱系數(shù)（λ∥，10.55 W/mK），可以有效耗散聚酰亞胺電熱膜和陶瓷發(fā)熱片工作過程中產(chǎn)生的熱積聚。更有趣的是，AgNWs/纖維素屏蔽膜還顯示出了出色的焦耳熱性能，在對人體絕對安全的工作電壓下具有良好的穩(wěn)定性和靈敏的熱響應(yīng)性。因此，這種多功能柔性AgNWs/纖維素薄膜在戶外大型變電設(shè)備和人體可穿戴設(shè)備的EMI屏蔽防護領(lǐng)域的應(yīng)用具有廣闊的前景。
附第一作者（梁超博）個人簡介
梁超博，男，遼寧開原人，2017級博士研究生。2015年在西北工業(yè)大學(xué)獲學(xué)士學(xué)位，同年加入顧軍渭教授課題組攻讀碩士學(xué)位，并于2017年提前攻讀博士學(xué)位。主要從事電磁屏蔽復(fù)合材料微結(jié)構(gòu)設(shè)計、性能調(diào)控及機理研究。2016年、2018年和2019年研究生國家獎學(xué)金獲得者。2018年陜西省第四屆研究生創(chuàng)新成果展評獎理科三等獎。2019年全國高分子學(xué)術(shù)論文報告會最佳墻報獎。主持西北工業(yè)大學(xué)研究生校企協(xié)同創(chuàng)新基金1項。在Sci Bull，Compos Sci Technol和Nanoscale等國際知名期刊以第一作者身份（含導(dǎo)師第一和共同第一）發(fā)表SCI論文11篇，SCI引用1700余次（入選第一作者身份ESI熱點論文4篇、高被引論文5篇），H因子17；發(fā)表在J Mater Chem C (2019, 7: 2725) 的論文被評為2019年期刊最受歡迎40篇文章之一；參加國際會議4次并作口頭報告；授權(quán)、公開國家發(fā)明專利7件。