Kapton And Pmma Film Analysis

CHAPTER 1 FUNDAMENTALS OF TRIBOELECTRIC GENERATORS

The Triboelectric effect is the phenomena in which refers to the charge generation between two different material with distinct electron surface affinities. When they brought in contact through friction, the different potential is created by separation of two material surfaces. Electrostatic induction is the process of generating electricity such that the electrons in one electron should flow to another electrode through external load to balance potential difference. The TENGs covert the mechanical energy into electrical energy by the integration of triboelectrification with electrostatic induction. There

If the generator is again supplied by external force the difference between the two interlayer reduces which leads to top electrode at high potential than bottom electrode. Then, electrons are driven back from bottom to top electrode which reduces the amount of charges induced as in Fig 4(VI). As two layers are in contact again induced charge are neutralized as in (II). Because of reciprocating motion the generator produces alternating

In this a PDMs film is uniformly covered with array of micro pyramids serves as a friction surfaces. The surface of skin is considered as another contact surface. A transparent ITO is cover on the back side of PET substrate. The change in distance between two surfaces results in charge transfer between ITO electrode and ground thus driving the flow of electrons through an external load. The energy harvesting mechanism is shown in Fig 6(b). As the human finger is in contact with PDMS surface the charge transfer occurs at the interfaces. The PDMS is more triboelectrically negative than human skin; it generates positive charges on human skin and negative charges on FEP. The electrons are injected from human skin into PDMS. The produced negative charges on PDMS surface remains for long time because of its insulator behavior. As the human finger separates from PDMS the potential difference is generated between ITO electrode and bottom ground reference electrode. The negative charges on PDMS side produce positive charge on ITO electrodes which results in flow of electrons through external load from ITO electrode to ground in order to reach an electrostatic equilibrium state. When human finger reverts back to PDMS surface again, the free electrons flow back from ground to ITO electrode until the skin and PDMS film are in full contact with each other which results in negative voltage/current signal as shown in Fig 6(b, IV).