Portal de Periódicos da CAPES

Stable and Transparent Ca 2+ -Cross-Linked Alginate Composite Films for EMI Shielding and Joule Heating

2024; American Chemical Society; Volume: 7; Issue: 2 Linguagem: Inglês

10.1021/acsanm.3c05384

2574-0970

Haijun Wang, Junhao Guo, Yuting Lei, Weiyun Chen, Zhichao Zhang, Meng Zhu, Hailong Xu,

Advanced Sensor and Energy Harvesting Materials

Transparent electromagnetic interference (EMI) shielding materials can be used for specific optoelectronic applications. Herein, a uniform silver nanowire (AgNW) network was fabricated on a commercial polyimide film via a spraying method. The interconnected and effective conductive network with welded junctions was fastened onto a sodium alginate-based biopolymer substrate via rod-coating and -transferring methods to improve electrical conductivity and optical transmittance of composite films simultaneously. Moreover, another SA-based layer was coated to encapsulate the AgNW network firmly, followed by cross-linking with calcium ions (Ca2+), enabling the CA-based barrier to protect the nanowires from corrosion by moisture and oxygen in the air. Consequently, the obtained flexible CA/AgNWs/CA composite film achieved a satisfactory EMI shielding effectiveness of 27.9 dB with a favorable optical transmittance of 72.8% at 550 nm. Furthermore, the composite film also showed excellent Joule heating performance with a sensitive thermal response and good stability. The CA/AgNWs/CA composite film retained a stable EMI shielding efficiency after being exposed to air for 20 days with a slight decline in EMI SE upon cyclic bending deformation and thermal shock treatment several times because of the compact sandwich-like structure and cross-linked CA-based barrier. Thus, the flexible and transparent CA/AgNWs/CA composite film holds great promise for practical applications in optical electronic devices.