A novel tri-layer flexible piezoelectric nanogenerator based on surface- modified graphene and PVDF-BaTiO₃ nanocomposites

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>The fabrication and characterization of a novel tri-layer piezoelectric nanogenerator (PNG) based on poly(vinylidene fluoride) (PVDF), barium titanate (BTO), and surface-modified <I>n</I>- type graphene (<I>n</I>-Gr) have been investigated. The <I>n</I>-Gr, with its majority of negative charge carriers, plays a vital role in enhancing the energy-harvesting performance by aligning the dipoles in one direction. The tri-layer structure obtains by stacking two layers of PVDF-BTO nanocomposite films, one on each side of the <I>n</I>-Gr layer. The fabricated tri-layer PNG shows a maximum output voltage of 10V (pk-pk) along with a current of 2.5μA (pk-pk) at an applied force of 2N. Furthermore, the PNG Exhibits 5.8μW instantaneous power at 1MΩ load resistance. Moreover, the fabricated device demonstrated good stability even after 1000 pressing–releasing cycles. This novel tri-layer PNG structure can opens a promising avenue for future piezoelectric generating technologies.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Tri-layer structure was achieved by stacking two layers of PVDF-BTO films, on one each side of n-graphene layer. </LI> <LI> The role of n-graphene in increasing the energy harvesting property of PNG has been explored. </LI> <LI> Third layer of PVDF-BTO was used to block the charge recombination between upper electrode and n-graphene. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Tri-layer piezoelectric nanogenerator schematic diagram and working mechanism.</P> <P>[DISPLAY OMISSION]</P>