| 초록 |
Although harvesting abundantly available wasted ambient mechanical energies from human activity, machinery vibration, noise or sound waves, air flow, and water flow for powering wireless sensor networks has been a long standing dream, the energy conversion efficiency is not yet high enough for various applications and should be enhanced further. In addition, for better compatibility with wearable devices, textile-based nanogenerator technology should be developed. In this paper we report on the dopant incorporated polyvinylidene fluoride nanofibers (PVDF NFs) by an electrospinning method and applied as an active layer in triboelectric nanogenerators (TENGs). Structural and optical investigations showed that the dopant was successfully doped into the PVDF NFs and induced discrete emissions corresponding to their electronic transitions. As the dopant content increased, the phase transformation from the α-phase to the β-phase was enhanced in the PVDF NFs, and their diameter was decreased. These changes enhance the electrical output power of the TENGs. However, further addition of dopant resulted in precipitation of the impurity related complex on the surface of the PVDF NFs, which was detrimental for the TENG performance. Because of these conflicting effects, the output power increased from 13 to 26 μW/cm2 as the dopant content increased from 0 to 2.7 wt%, while it decreased drastically to 4.9 μW/cm2 when increasing the dopant content further to 5.3 wt%. Therefore, there is an optimum amount of dopant doping for obtaining advantageous effects. |
