Preparation and performance of double-layer metal mesh transparent conductive films based on crack template method

In order to improve the electromagnetic shielding performance of the single-layer metal mesh transparent conductive films (SMMTCFs) based on the crack template method, the preparation of double-layer metal mesh transparent conductive films (DMMTCFs) by using the crack template method is studied. The double-layer cracked templates are prepared by spin-coating crack glue on both sides of the transparent substrate and by pulling the transparent substrate from the cracked adhesive solution with a certain rate to obtain the corresponding double-layer cracked templates, respectively. After obtaining the double-layer crack templates by the spin-coating method and the pulling method, respectively, the corresponding DMMTCF samples are obtained by metal deposition and degumming process. First, the performances of single-layer and double-layer metal mesh samples prepared by the spin-coating method under the same conditions are measured and compared with each other, and the optical transmittance of the double-layer structure decreases by nearly 10.9% compared with that of the single-layer structure, while the electromagnetic shielding effectiveness in the Ku band (12–18 GHz) increases by 30 dB. In addition, the double-layer metal mesh sample prepared by the pulling method is also tested. Compared with the single-layer metal mesh sample prepared under the same conditions, the double-layer structure can improve electromagnetic shielding effectiveness in the Ku band by 20 dB under the premise of losing 8.38% optical transmittance. The measurement results show that the electromagnetic shielding performance of the double-layer metal mesh transparent conductive films can be significantly improved at the expense of some optical transmittance performances. Through the preparation and performance study of DMMTCFs based on the cracked template method, the low-cost advantage of the cracked template method can be fully utilized to prepare DMMTCFs with high electromagnetic shielding performance.