Outstanding electromagnetic interference shielding effectiveness of polyvinylbutyral–polyaniline nanocomposite film

Abstract

In this study, we studied the electromagnetic interference (EMI) shielding property of a solution processed polyvinylbutyral–polyaniline nanocomposite (PVBPN) film in the X-band (8.2–12.4 GHz) and Ku-band (12.4–18 GHz) frequency. The polyaniline nanofibers were chemically synthesized at −30 ± 2 °C and characterized by various techniques. The optimally prepared, free standing PVBPN film (sandwiched 0.78 ± 0.02 mm) shows an outstanding EMI shielding effectiveness in the X-band and Ku-band frequency. In the X-band, ∼26 dB EMI shielding effectiveness (shielding due to absorption SE_A ∼ 21 dB and shielding due to reflection SE_R ∼ 5 dB) was obtained and was found to increase ∼30 dB (SE_A is ∼26 dB and SE_R ∼ 4 dB) for the Ku-band. The enhancement of shield conductivity, dielectric loss and EM attenuation constant with frequency results in the excellent EMI shielding property of the PVBPN film.