Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Effect on TENG Performance by Phase Control of TiOx Nanoparticles

  • Huynh, Nghia Dinh (Department of Mechanical Engineering, Kyung Hee University) ;
  • Park, Hyun-Woo (Department of Mechanical Engineering, Kyung Hee University) ;
  • Chung, Kwun-Bum (Department of Physics and Semiconductor Science, Dongguk University) ;
  • Choi, Dukhyun (Department of Mechanical Engineering, Kyung Hee University)
  • Received : 2018.07.24
  • Accepted : 2018.11.28
  • Published : 2018.12.31
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Abstract

One of the critical parameters to improve the output power for triboelectric nanogenerators (TENGs) is the surface charge density. In this work, we modify the tribo-material of TENG by introducing the $TiO_x$ embedded Polydimethylsiloxane (PDMS) in anatase and rutile phase. The effect of dielectric constant and electronic structure of the $TiO_x$ on the capacitance of TENG and the output power as well are discussed. The surface charge density is increased as the control of the dielectric constant in difference weight percent of $TiO_x$ and PDMS. As the results of that, the 5% $TiO_x$ rutile phase and 7% $TiO_x$ anatase phase embedded PDMS exhibit the highest TENG output. The peak value of voltage/current obtained from $TiO_x$ rutile and anatase phase are ${\sim}180V/8.2{\mu}A$ and $211.6V/8.7{\mu}A$, respectively, at the external force of 5 N and working frequency of 5 Hz, which gives over 12-fold and 15-fold power enhancement compared with the TENG based on the pristine PDMS film. This study provides a better understanding for TENG performance enhancement from the materials view.

Keywords

BHJRB9_2018_v31n6_365_f0001.png 이미지

Fig. 2. The effect various TiOx NPs embedded PDMS composition in (a)-(b) rutile and (c)-(d) anatase phase as a function of the TENG output voltage and current

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Fig. 3. Dielectric constant linearly changes as a function of TiOx NPs embedded PDMS weight ratio from 0% to 30% wt % in rutile and anatase phase

BHJRB9_2018_v31n6_365_f0003.png 이미지

Fig. 4. O-K edge XAS spectra of PDMS layers as a function of the TiOx NPs embedded PDMS by weight ratio

BHJRB9_2018_v31n6_365_f0004.png 이미지

Fig. 1. (a) Experimental design for TiOx NPs embedded PDMS based TENG, (b) XRD analysis of TiOx NPs Anatase and Rutile phase

Table 1. Dielectric constant of different wt% of rutile and anatase TiOx NPs embedded PDMS

BHJRB9_2018_v31n6_365_t0001.png 이미지

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