Boosting the Green EMI Shielding and Piezoelectric Energy Generation by Defect-Driven Microstructure Manipulations

Abstract

The rapid proliferation of sophisticated wireless industrial and remote sensing systems with limited power sources has created a confluence for the development of piezoelectric energy harvesting materials (PEHM) with electromagnetic interference (EMI) shielding to ensure secure and reliable operations. Herein, polydimethylsiloxane (PDMS)/single wall carbon nanotube (SWCNT)/graphitic carbon nitride doped lithium potassium niobate (GNLKN) based PEHM with excellent EMI shielding capability has been prepared. In contrast to the PDMS/LKN-based PEHM, which has 19.6 V of potential, 24.26 nA of current, and 29.7 nW/cm2 of power density, the PDMS/GNLKN-based PEHM provides an astounding 49.57 V of potential, 59.4 nA of current, and 188.4 nW/cm2 of power density. Additionally, composites based on PDMS/SWCNT/GNLKN with regulated excluded volume exhibit an improved shielding performance of ~85 dB by adjusting the excluded volume and SWCNT concentrations. The green index value of more than one of the composites signifies an environmentally friendly absorption-controlled shielding efficacy with restricted reflection.