| Summary: | 碩士 === 南臺科技大學 === 機械工程系 === 106 === Triboelectric energy harvesting technology relates to gathering tiny wattages of power from motion and vibrations and has attracted great interest in renewable and green energy applications including self-powered electronic device, touch sensors, artificial skin, portable and wearable electronics. As one of the most commonly available energies in the environment, mechanical energy has been used for a long time by converting itself into electrical energy through generators, such as electromagnetic generators (EMGs), piezoelectric nanogenerators (PENGs), and triboelectric nanogenerators (TENGs). Among them, triboelectric nanogenerators, which are based on contact electrification and electrostatic induction, have shown advantages of high output power, high energy conversion efficiency, low cost, and abundant choices of materials. In this study, we have developed a novel, flexible based TENG utilizing Polyvinylidene fluoride (PVDF) nanofibers and commercial nylon cloth weaved together. The PVDF nanofibers are fabricated using Centrifugal Jet Spinning (CJS) technique. When the centrifugal force is higher than the surface tension, the nozzle will jet PVDF solution onto the collector in the form of piezoelectric nanofibres. Since the PVDF nanofibers have small structural features, it significantly increases the surface area on contact, hence amplifying response and increasing sensitivity. In the original state, no charge is generated or induced, with no electric potential difference between ground and the electrode. When an external force is applied to TENG device, the PVDF nanofibers and nylon cloth come into contact. The application of mechanical stress results in an electrical charge output from the piezoelectric PVDF nanofibers. Meanwhile, due to contact with the nylon cloth, the surface is also charged based on the triboelectric effect. On release, the electric potential difference results in charge flowing through the external circuit between the two friction layers. This combined use of piezoelectric and triboelectric effects can lead to enhanced power generation. The prepared TENG was tested using a standard periodic dynamic force measurement platform. which simulates the situation of human touch, and the induced charge generated can be observed using an electrometer with very large input resistance(Keithley,6514). Consequently, the developed flexible and low cost nanogenerator has potential to supply power sustainably for a wide range of practical applications.
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