Document Type

Article

Publication Date

9-3-2022

Keywords

Tribo-electric-nano-generator, MEMS, shock sensing, actuators, self-powered, energy harvester

Abstract

This work shows zero-power shock sensing for the combination of a micro-triboelectric generator and MEMS electrostatic actuator system where the mechanical shock to the generator causes it to produce volt- age, this voltage is used to actuate a Micro-Electro-Mechanical-system (MEMS) switch. For the first time, we present the fabrication process of a Triboelectric-Nano-Generator (TENG) with MEMS technology. The MEMS-TENG has a suspended 1.5mm × 1.5mm plate separated by 2 μm from the substrate. The generator is a triboelectric transducer made of a suspended Al micro-plate above a polyimide (PI) thin layer that is covered by another Al layer in the back. In case the shock is sufficiently strong, the micro-plate hits its substrate. As a result of the impact, electrification happens and PI gets negatively charged, while the Al gets positively charged. Connecting the generator to a MEMS switch, we use the generated voltage to actuate a MEMS switch. The TENG was able to supply voltage difference up to 0.4 V at 2.3 g. We use the MEMS-TENG to actuate a cantilevered MEMS switch (500x20x2 μm) separated by a 2μm gap from a fixed bottom electrode.Triboelectric generators are known for high voltages and low currents, which makes them ideal for integration with MEMS electrostatic devices that require ultra-low power to operate. Our feasibility study opens doors to billions of innovative devices that can be created from this synergistic combination.

Available for download on Tuesday, September 03, 2024

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