双功能聚二甲基硅氧烷/铜纳米线复合薄膜的制备与性能

通过环境友好的葡萄糖模板法和改进的湿化学还原法制备了聚二甲基硅氧烷/铜纳米线(PDMS/CuNWs)复合薄膜, 其采用的“类夹心结构”有效解决了铜在空气中易氧化进而导致电导率大幅度下降的问题, 同时获得了具有优异电磁屏蔽和光热转化性能的双功能轻质柔性复合薄膜. CuNWs面密度为1.6 g/cm²的复合薄膜在重复弯折1000次后性能保持率最高可达99.07％; CuNWs面密度为2.4 g/cm²的复合薄膜在X波段下总电磁屏蔽效能达到30.1 dB, 屏蔽效率达到99.9％; 同时, 在2 W/cm²的近红外光照射下, 复合薄膜在仅加热15 s后其表面温度高达211.2 ℃, 具有十分快速的光热响应和转化效率.

Preparation and Properties of Bifunctional Polydimethysiloxane/Copper Nanowire Composite Films

A polydimethylsiloxane/copper nanowires（PDMS/CuNWs） composite film was prepared by an environmental-friendly glucose templating method and an improved wet chemical reduction method. PDMS/CuNWs composite adopts a “sandwich-like structure” design. It effectively solves the problem that copper is easily oxidized in the air， which leads to a significant drop in electrical conductivity. At the same time， a bifunctional lightweight and flexible composite film with excellent electromagnetic shielding and photothermal conversion properties is obtained. The performance retention rate of the composite film with an CuNWs area density of 1.6 g/cm² can reach up to 99.07% after 1000 repeated bending times； the total electromagnetic shielding efficiency of the composite film with an area density of 2.4 g/cm² in the X-band reaches 30.1 dB， and the shielding efficiency reaches 99.9%； meanwhile， under the irradiation of near-infrared light of 2 W/cm²， the surface temperature of the composite film is as high as 211.2 ℃ after heating for only 15 s. PDMS/CuNWs composite has a very fast photothermal response and conversion efficiency.