마찰전기 에너지 하베스팅 성능 향상을 위한 PDMS/Cu₂O 복합체의 합성 공정 조건 및 함량 조절

초록

In this study, polydimethylsiloxane (PDMS)-Cu₂O composites were fabricated to enhance the triboelectric performance of triboelectric nanogenerators (TENGs), and the effects of synthesis conditions and filler content were systematically investigated. Cu₂O nanoparticles were synthesized through an alkaline precipitation followed by ascorbic acid reduction, and their crystallinity and microstructure were tailored by controlling the synthesis temperature. XRD and SEM analyses revealed that higher synthesis temperatures promoted more uniform particle size distribution. When incorporated into the PDMS matrix, the Cu₂O fillers significantly improved the output performance of the TENG devices. The pristine PDMS-based TENG exhibited a voltage of 119 V and a current density of 28.69 mA/m², whereas the composite with 7 wt% Cu₂O achieved 410 V and 44.76 mA/m², corresponding to approximately 3.4- and 1.6-fold enhancements, respectively. Dielectric measurements confirmed that the effective permittivity of the composites increased with Cu2O loading, directly contributing to enhanced charge storage capability. Moreover, the well-dispersed Cu₂O particles generated micro-scale surface roughness, which enlarged the effective contact area, while interfacial charge trapping at the Cu2O-PDMS boundary contributed to reduced charge recombination and improved output stability.

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