Nanointerface Insights in PVDF Films with Low Loading of Nitrogen-Doped Carbon Dots for High Energy Density Storage and Harvesting
Vishwa Pratap Singh, Akhilesh Kumar Singh, Mustafa Ordu
Abstract
This work demonstrates the enhancement of the electroactive phase of the nanocomposite, resulting in a high energy density storage and piezoelectricity. Low loading (≤1 wt %) of synthesized nitrogen-doped carbon dots (N-CDs) reinforced in poly(vinylidene fluoride) (PVDF) accelerated the formation of electroactive phases with conformational changes in the polymer chain. The addition of 1 wt % N-CDs to the PVDF polymer matrix increased the dielectric constant by 2.18 times, and the maximum polarization reached a multiplication of 2.32 compared to pure PVDF films. Moreover, a 1.62 times enhancement in the piezoelectric coefficient d 33 resulted in a voltage sensitivity of 22.28 mV/N for as low as 1% filler reinforcement. The simulation results further confirmed the increase in dielectric constant and piezoelectric coefficient. The N-CD-integrated PVDF films are promising candidates for energy storage and harvesting applications.