Outstanding electromagnetic interference shielding effectiveness of polyvinylbutyral-polyaniline nanocomposite film

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 degrees 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, similar to 26 dB EMI shielding effectiveness (shielding due to absorption SEA similar to 21 dB and shielding due to reflection SER similar to 5 dB) was obtained and was found to increase similar to 30 dB (SEA is similar to 26 dB and SER similar to 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