Triboelectric contact surface charge modulation and piezoelectric charge inducement using polarized composite thin film for performance enhancement of triboelectric generators. (July 2016)

• Record Type: Journal Article
• Authors: Kwon, Yang Hyeog; Shin, Sung-Ho; Kim, Young-Hwan; Jung, Joo-Yun; Lee, Min Hyung; Nah, Junghyo
• Is Part Of: Nano energy. Volume 25(2016:Jul.)
• Page Start: 225
• Page End: 231
• Publication Date: 2016-07
• Subjects: Triboelectricity -- Ferroelectric polarization -- Ceramic-polymer composite; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2016.05.002
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: We report performance enhancement of triboelectric generators (TEGs) by modulating dielectric permittivity and optimizing the effects from polarized dipoles in the composite thin films, composed of barium titanate nanoparticles (BTO NPs) and polydimethylsiloxane (PDMS). Thanks to BTO's high permittivity and ferroelectric property, the composite thin films provide excellent platforms to examine both permittivity modulation and surface dipole effects on performance of TEGs. Our results show that peak output power density of the TEGs is increased in proportion to cubic BTO NP wt% in the composite layer, increasing permittivity of it. More interestingly, both contact surface charge density modulation and piezoelectric charge inducement were achieved by polarized tetragonal BTO NPs in the composite layer. By optimizing wt% of tetragonal BTO NPs and polarization of the composite layer, the output performance of TEG was greatly improved, generating the output voltage of ~380 V and peak power density of 2.5 mW cm −2 with a 10 MΩ load resistance. The work here provides simple performance enhancement methods and offers an insight into the roles of both permittivity-induced and polarized dipole-induced effects on the electrical output of TEGs. Graphical abstract: Highlights: The cubic and tetragonal BTO NPs-PDMS composite TEGs' fabrication and optimization for performance enhancement. The triboelectric contact surface density modulation by polarized dipoles and charge inducement by piezoelectric effect using polarized tetragonal BTO NPs. The roles of polarized dipoles and piezoelectric charge generation on the performance of TEG.