| 초록 |
The importance of energy harvesting is being emphasized as the Internet of Things (IoT) technology evolves. Accordingly, energy harvesting devices are required to harvest energy in an environment-friendly method as well as to reduce weight and minimize size. Representative energy harvesting technologies for converting mechanical energy into electrical energy include Piezoelectric Nanogenerator (PENG) using piezoelectric effects and Triboelectric Nanogenerator (TENG) using triboelectric effects. However, TENG technique generates a larger voltage and current than PENG. The output performance of TENG can be improved in two ways. First, the greater the difference in electron affinity between the two materials constituting the TENG device, the better the performance. Another way is to increase the contact area between the tho materials. Therefore, in order to increase the contact area, micro- or nano-patterning is performed, or it is fabricated in the form of nanofibers using electrospinning. The most common process for patterning on the surface is to cast a polymer solution into the patterned mold and then cure and peel it off. In this process, the curing takes a long time, and the membrane can be damaged easily during the exfoliation from the substrate. In this study, we report a facile and very fast pattern-formation technique by a modified phase-inversion process. The TENG performance was improved by fabricating PVDF and Nylon 66 as a pyramid-patterned membrane by phase inversion process. The pyramid-patterned membrane not only increased the surface area, but also caused a sliding mode, one of the TENG operating modes, during contact, resulting in improved TENG performance. |
