Yixin Han, Kunpeng Ruan and Junwei Gu*. Janus
(BNNS/ANF)-(AgNWs/ANF) thermal conductivity composite films with superior
electromagnetic interference shielding and Joule heat performances. Nano
Research, 2022, 15: 4747–4755. 2020IF=8.897.（1區材料科學Top期刊，中國科技期刊卓越行動計劃-領軍類期刊項目，2021中國最具國際影響力學術期刊）
https://link.springer.com/article/10.1007/s12274-022-4159-z
Abstract
Highly thermal conductivity materials with excellent electromagnetic interference shielding and Joule heating
performances are ideal for thermal management in the next generation of
communication industry, artificial intelligence and wearable electronics. In this work, thermal conductivity silver nanowires (AgNWs) are prepared by polyol
thermal method using silver nitrate as the silver source and ethylene glycol as
the solvent and reducing agent, and boron
nitride (BN) is taken as raw material to prepare thermal conductivity and
insulating boron nitride nanosheets (BNNS) with the help of isopropyl
alcohol (IPA) and ultrasonication-assisted peeling method, which are compounded
with aramid nanofibers (ANF) prepared by chemical dissociation, respectively, and the
(BNNS/ANF)-(AgNWs/ANF) thermal conductivity and electromagnetic interference
shielding composite films with Janus structure are prepared by the
“vacuum-assisted filtration and hot pressing” method. The results show that Janus (BNNS/ANF)-(AgNWs/ANF) thermal
conductivity and electromagnetic interference shielding composite films exhibit “one side insulating, one side conducting” properties, the surface resistivity of
the BNNS/ANF surface is 4.7×1013 Ω, while the conductivity of the
AgNWs/ANF surface is 5275 S/cm. The (BNNS/ANF)-(AgNWs/ANF) thermal conductivity and
electromagnetic interference shielding composite film with thickness of 95 μm
has a high in-plane thermal conductivity coefficient of 8.12 W/(m·K) and excellent electromagnetic
interference shielding performance of 70 dB. The composite film also has excellent mechanical
properties (tensile strength and tensile modulus of 122.9 MPa and 2.7 GPa,
respectively). It also has good temperature-voltage response
characteristics (high Joule heating temperature at low supply voltage (5 V,
215.0oC),
fast response time (10 s)), excellent electrical stability and reliability (stable
and constant real-time relative resistance under up to 300 cycles and 1500 s of
tensile-bending fatigue work tests).
兼具優異電磁屏蔽性能和焦耳熱性能的高導熱材料是下一代通訊工業、人工智能和可穿戴電子產品領域中理想的熱管理材料。本文以硝酸銀為銀源、乙二醇為溶劑和還原劑，采用多元醇熱法制備導熱導電銀納米線（AgNWs），并以氮化硼（BN）為原料，借助異丙醇（IPA）及超聲輔助剝離法制備導熱絕緣氮化硼納米片（BNNS），分別與化學解離制備的芳綸納米纖維（ANF）復合，經“真空輔助抽濾-熱壓”法制備具有Janus結構的(BNNS/ANF)-(AgNWs/ANF)導熱屏蔽復合膜。結果表明，Janus (BNNS/ANF)-(AgNWs/ANF)導熱屏蔽復合膜展現出“一面絕緣、一面導電”特性，BNNS/ANF面表面電阻率為4.7×1013 Ω，而AgNWs/ANF面電導率為5275 S/cm。95 μm厚的(BNNS/ANF)-(AgNWs/ANF)導熱屏蔽復合膜具有8.12 W/(m·K)的高面內熱導率和70 dB的卓越電磁屏蔽效能。該復合膜還具有優異的力學性能（拉伸強度和拉伸模量分別為122.9 MPa和2.7 GPa），良好的溫度-電壓響應特性（如低供電電壓下的高焦耳加熱溫度（5 V、215.0oC）、快速響應時間（10 s）），優異的電穩定性和可靠性（長達300次、1500 s的拉伸-彎曲疲勞工作試驗下表現出穩定和恒定的實時相對電阻）。
本文亮點
1. 采用“真空輔助抽濾-熱壓”法制備的(BNNS/ANF)-(AgNWs/ANF)導熱屏蔽復合膜展現出“一面絕緣、一面導電”特性。BNNS/ANF面表面電阻率為4.7×1013 Ω，而AgNWs/ANF面電導率為5275 S/cm。
2. (BNNS/ANF)-(AgNWs/ANF)導熱屏蔽復合膜具有高達8.12 W/(m·K)的高面內熱導率、70 dB的卓越電磁屏蔽效能，以及優異的力學性能（拉伸強度和拉伸模量分別為122.9 MPa和2.7 GPa）。
3.
(BNNS/ANF)-(AgNWs/ANF)導熱屏蔽復合膜良好的溫度-電壓響應特性（如低供電電壓下的高焦耳加熱溫度（5 V、215.0oC）、快速響應時間（10 s））。
4.
(BNNS/ANF)-(AgNWs/ANF)導熱屏蔽復合膜具有優異的電穩定性和可靠性（長達300次、1500 s的拉伸-彎曲疲勞工作試驗下表現出穩定和恒定的實時相對電阻）。