Effects of embedded TiO2-x nanoparticles on triboelectric nanogenerator performance

Hyun Woo Park, Nghia Dinh Huynh, Wook Kim, Hee Jae Hwang, Hyunmin Hong, Kyu Hyeon Choi, Aeran Song, Kwun Bum Chung, Dukhyun Choi

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

Triboelectric nanogenerators (TENGs) are used as self-power sources for various types of devices by converting external waves, wind, or other mechanical energies into electric power. However, obtaining a high-output performance is still of major concern for many applications. In this study, to enhance the output performance of polydimethylsiloxane (PDMS)-based TENGs, highly dielectric TiO2-x nanoparticles (NPs) were embedded as a function of weight ratio. TiO2-x NPs embedded in PDMS at 5% showed the highest output voltage and current. The improved output performance at 5% is strongly related to the change of oxygen vacancies on the PDMS surface, as well as the increased dielectric constant. Specifically, oxygen vacancies in the oxide nanoparticles are electrically positive charges, which is an important factor that can contribute to the exchange and trapping of electrons when driving a TENG. However, in TiO2-x NPs containing over 5%, the output performance was significantly degraded because of the increased leakage characteristics of the PDMS layer due to TiO2-x NPs aggregation, which formed an electron path.

Original languageEnglish
Article number407
JournalMicromachines
Volume9
Issue number8
DOIs
StatePublished - 17 Aug 2018

Keywords

  • High dielectric constant
  • Oxygen vacancy
  • TiO nanoparticle
  • Triboelectric nanogenerators

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