Abstract
As electronic devices become popular in the application of military, industrial, communications, biomedical, and in space, some noise pollution, radio frequency interference (RFI), radio radiation, electromagnetic interference (EMI) problems are more serious. These problems will not only interfere with equipment but damage to human health. Therefore, in order to prevent these disturbances become more serious, developed with technology or electromagnetic shielding material is very important. This study wishing graphene as an electrically conductive filler, blended with water soluble polyvinyl alcohol. We make use of the good film-forming properties of polyvinyl alcohol, to prepared a composite film with electromagnetic shielding properties. This process does not use organic solvent, in line with concept of environmental protection. Furthermore, in order to achieve good graphene dispersion in polyvinyl alcohol substrate, we using dispersant to disperse graphene to achieve a better degree of conductivity, and have better electromagnetic shielding effects. On the other hand, silver nanowires have well conductivity and good stability. Therefore, in order to build a better electrically conductive network, this study added silver nanowires as second filler material. We also used glutaraldehyde to crosslink PVA to enhance the water resistance of composite. Finally, at ASTM-D4935-99 test specification, using vector network analyzer to detect the electromagnetic shielding effect of composite film to give a electromagnetic shielding effect, excellent workability, and nontoxic PVA / graphene / silver nanowires composite film.