Fabrication of indium-tin-oxide free, all-solution-processed flexible nanogenerator device using nanocomposite of barium titanate and graphene quantum dots in polyvinylidene fluoride polymer matrix

摘要

We demonstrated the feasibility of indium-tin-oxide free, solution processable flexible nanogenerator using the nanocomposite mixture consists of polyvinylidene fluoride polymer, barium titanate and graphene quantum dots (GQDs) on the 2.0 cm by 2.5 cm polyethylene terephthalate substrate. Poly (3, 4-ethylenedioxythiophene)-poly (styrenesulfonate) was used as the bottom conductive layer to replace the commonly used ITO bottom electrode. The multi-stacking layers were deposited using spin-coating method and the top metal electrode contacts were formed by spray-coating technique. Nanogenerator device integrated with GQDs was fabricated to examine the influence of the GQDs towards the electrical performance by compared to reference device without the presence of GQDs. Significant higher output voltage was obtained from transverse mode deformation for nanogenerator device with 4.6 Vpeak-to-peak and 48 m s wider width of positive polarity output signal. It might be associated to the presence of GQDs in enhancing the higher output voltage by charges trapped effect at the interface between GQD fillers and PVDF phases. The fabricated nanogenerator device was able to light up a light emitting diode when connected to external circuit and being stable up to 60 h without significant degradation.