การขึ้นรูปและการเก็บเกี่ยวพลังงานจากการสั่นของวัสดุประกอบอิเล็กโทรสตริกทิฟที่เจือสารนำไฟฟ้าด้วยเทคนิก การยิงแสงเลเซอร์กำลังสูง

Abstract

Electrostrictive polymers have demonstrated an ability to convert mechanical energy into electrical energy and vice versa. The mechanism to be used in this study is to apply mechanical strain to the polymer and measure its generated electricity. This energy conversion has been exploited in an extensive range of applications, including sensors and actuators. The goal of energy harvesting is to capture the energy surrounding the material and then convert it into usable electrical energy. Recently, electrostrictive polymers have gained their renewed interest as smart materials for energy harvesting. It is possible that the energy harvested on ambient vibration with electrostrictive polymers can lead to the self-powered electronic devices, e.g., wireless sensors without the battery usage. The purpose of this research is to fabricate the novel electrostrictive polymer composites base on interfacial mechanism for energy harvesting and flexible actuators. This research, a pulsed laser ablation technique was used to synthesize of conducting nanoparticles, while conductive polyaniline (PANI) and graphene (GRN) used as fillers for electrostrictive polymer composite. The Three phase composite can enhance the electric field-induced strain and energy harvesting capability of electrostrictive materials with accumulated charges and interfacial polarization. Important parameters such as the figure of merit for analyzing the energy conversion capability of these composites are characterized by morphological, thermal, dielectric and electrostrictive properties. The electrostrictive coefficient of all samples was investigate using a photonic displacement apparatus setup. This coefficient is one of crucial parameters for predicting the energy harvesting. Effect of fillers on their electrostrictive properties are also studied. Moreover, harvested current and harvested power from vibration energy of these composites are evaluated and performed on the double clamp holder with help of shaker. The study has demonstrated a useful way to simultaneously improve the energy conversion for electroactive materials as well as render it suitable for energy harvesting. From the results show the dielectric constant of composite films strongly increases with filler loading, which was related to the interfacial charge distribution between the PU and either PANI or graphene fillers. Consequently, the increments of the electrostriction coefficient in electrostrictive polymer composites were observed with increasing filler contents A greater electrostriction effect of the PU three-phase composites at low electric field significantly is higher which related with contribute to conduction and interfacial polarization base on space charges distribution, filler-filler network and microstructure on crystallinity in the HS domain of PU matrix. Thus, larger induced strain behavior can be obtained on three phase composites. The coexistence with PANI and graphene in the electrostrictive PU matrix strongly relate to the energy conversion ability and provided high output power. Therefore, as the results indicated that they can be a potentially good actuator and vibration energy harvesting.