Effects of particle size of dielectric fillers on the output performance of piezoelectric and triboelectric nanogenerators

Abstract

Recently, piezoelectric/triboelectric nanogenerators based on piezoelectric composite materials have been intensively studied to achieve high electrical output performance. In this work, flexible BaTiO3 (BT)/PDMS nanocomposite films with various sizes and concentrations were fabricated and used as the nanogenerators. The influence of dielectric properties on the electrical output of nanogenerators was studied as well as the structure of the composites. The dielectric constant increased from 6.5 to 8 with the concentration of BT nanoparticles and decreased with the frequency from 102 to 106 Hz. Furthermore, the dielectric constant showed 11% decrease with the temperature range from 30 to 180 °C. It was found that the concentration of BT nanoparticles has promoted the electrical output of nanogenerators. The output voltage and current are all enhanced with the BT nanoparticles, which reached 200 V and 0.24 °A in TENG with 40 wt% BT nanoparticles, respectively. The selected device exhibited the power of 0.16 mW and employed to demonstrate its ability to power wearable/portable electronics by lighting the LEDs.

A flexible self-poled piezocomposite nanogenerator based on H2(Zr0.1Ti0.9)3O7 nanowires and polylactic acid biopolymer

“…This can be explained by an enhancement of the dielectric constant of the composite with nanofiller addition, and a higher dielectric constant of nanocomposite films has a good capability of storage charge, which can lead to better piezoelectric properties. 64 Nevertheless, excessive HZTO-nw@PDA content will cause agglomeration, deterioration of the mechanical properties, limits the movement of PLA dipoles and eventually weakens the polarizability of the nanocomposite, which results in a decline of the piezoelectric performance. 65 Accordingly, we will focus only on the piezocomposite with 20 vol% of HZTOnw@PDA.…”

The benefits of combining 1D and 3D nanofillers in a piezocomposite nanogenerator for biomechanical energy harvesting

“…This can be explained by an enhancement of the dielectric constant of the composite with filler addition, and a higher dielectric constant of nanocomposite films has a good capability of storage charge, which can lead to better piezoelectric properties. 45 Nevertheless, above 20 vol%, a decline of the piezoelectric performance is observed due the filler agglomeration, i.e. deterioration of the mechanical properties which limits the movement of PLA dipoles and eventually weakens the polarizability of the nanocomposite.…”

Recent Advances on Conducting Polymers Based Nanogenerators for Energy Harvesting

“…Tremendous efforts have been made to improve the dielectric constant and mechanical properties of PENG by including nanofillers such as synthetic crystals/ceramics and 2D materials into a piezoelectric or other polymer matrix, which has been shown to be effective. It is true that the manufacture of this device involves the use of nanomaterials such as nanowires, microparticles, and nanoflakes [36]. Similar to the dielectric energy storage devices [37][38][39][40][41], the synthetic crystal/ceramic components, such as barium titanate (BaTiO 3 ) [42], lead zirconate titanate (PZT) [43], Zinc sulphide (ZnS) [44], and ZnO [45,46] were proposed in many studies in the literature to improve the energy conversion efficiency and output performance [47].…”