Shell thickness and defect engineering for eximious thermal, electromagnetic, hydrophobic, and mechanical capabilities in Cu@ammonium gluconate core–shell nanofibers,Chemical Engineering Journal

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Shell thickness and defect engineering for eximious thermal, electromagnetic, hydrophobic, and mechanical capabilities in Cu@ammonium gluconate core–shell nanofibers
Chemical Engineering Journal ( IF 13.3 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.cej.2024.158718
Ran Ji, Baoxin Fan, Xiaoru Zhou, Shiqi Shui, Kaixin Liang, Jiarui Yu, Guoxiu Tong, liyan Xie, Tong Wu

Cu nanofibers have appeared as promising nanomaterials for application in thermal dissipation and microwave absorption/shielding. However, their practical application is limited by high conductivity, poor impedance matching, and low chemical stability. To mitigate these drawbacks, multifunctional Cu@ammonium gluconate core–shell nanofibers (Cu@AG CSNFs) are prepared via a simple one-step hydrothermal reduction, in which AG shell thickness and defects are adjusted by a competitive growth between AG shell and Cu core at various temperatures. Benefiting from the electron/phonon co-transmission and continuous 3D crosslinked framework, the Cu@AG CSNFs/TPU films exhibit a large thermal conductivity (23.07 W/(m⋅K); 8 wt%), high strength, excellent elasticity, and effective waterproofing. Meanwhile, the film of Cu@AG CSNFs can function as a Joule heater thanks to its fast thermal response, terrific working stability, and excellent repeatability. Besides, the Cu@AG CSNFs possess prominent microwave absorption capability (ABW = 6.24 GHz; 8 wt% load) and stealth performance, resulting from the synergic effect of heterointerfaces, tunable defects, and 1D structure. These properties exceed those of other Cu-based composites. Our work provides both theoretical and experimental evidence for developing high-performance multifunctional polymer-based films, which are expected to be used in challenging environmental conditions, such as heavy rainfall, high humidity, and extreme cold.

更新日期：2024-12-20

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