EMI Shielding Effectiveness of Polyacrylonitrile Fabric With Polyaniline Deposition by Reactive Ink-Jet Printing and Model Approach

摘要

This study reports the simple, inexpensive, and in situ deposition of polyaniline (PANI) on polyacrylonitrile (PAN) woven fabric with the reactive ink-jet printing technique aimed at the manufacturing of multilayered electromagnetic interference (EMI) shields. The electrical characteristics of fabric samples are measured by the van der Pauw method. The surface resistance value of the treated fabrics steadily decreases when the number of the PANI-printed layers increases and reaches the lowest surface resistance value of 20 Ω/sq. The PANI-printed PAN structures are characterized and evaluated in terms of their electromagnetic shielding effectiveness (SE), absorption (insertion loss), and reflection characteristics. These characteristics are determined by means of a network analyzer with a frequency range from 2.6 to 18 GHz. One layer of PAN fabric ink-jet printed with conducting PANI, which gives a surface weight equal to ca 20 g/m2, shows a SE of ca 5 dB. However, tripling the surface weight of PANI on PAN fabric shows a SE of ca. 12 dB, whereas a fivefold increase in the PANI surface weight shows a SE of ca. 22 dB. The equivalent analog circuit model with an approximation approach for predicting the SE, reflection coefficient, and insertion loss for the cases, which are not experimentally tested is proposed.