Dynamic behavior of ultra large graphene-based membranes using electrothermal transduction
| Autor: | Asaad K. Al-mashaal, Graham S. Wood, Enrico Mastropaolo, Rebecca Cheung, Michael J. Newton, Alberto Torin |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) business.industry Graphene Bilayer 010401 analytical chemistry Direct current 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Vibration Transducer Membrane law Optoelectronics Thin film 0210 nano-technology business Alternating current |
| Zdroj: | Al-masha'al, A, Wood, G, Torin, A, Mastropaolo, E, Newton, M & Cheung, R 2017, ' Dynamic behavior of ultra large graphene-based membranes using electrothermal transduction ', Applied Physics Letters, vol. 111, no. 24, 243503 . https://doi.org/10.1063/1.5007327 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/1.5007327 |
| Popis: | This letter reports an experimental study of an electrothermal actuator made from an ultra-large graphene-based bilayer thin film with a diameter to thickness aspect ratio of ∼10 000. Suspended thin films consisting of multilayer graphene and 350–500 nm-thick Poly(methyl methacrylate) have been transferred over circular cavities with a diameter of 3.5 mm. The use of bilayer materials with different mechanical and thermal properties results in thin film structures that can be induced to vibrate mechanically under the electrothermal transduction mechanism. The dynamic response of the bilayer has been investigated electrothermally by driving the structures with a combination of alternating current and direct current actuation voltages (Vac and Vdc) and characterizing their resonant frequencies. It has been found that the bilayer thin film structure behaves as a membrane. In addition, the actuation configurations affect not only the amplitude of vibration but also the tuning of the resonant frequency of the vibrating membranes. The existence of Joule heating-induced tension lowers the mechanical stiffness of the membrane and hence shifts the resonant frequency downwards by −108187 ppm. A resonant frequency of 3.26 kHz with a vibration amplitude of 4.34 nm has been achieved for 350 nm-thick membranes under actuation voltages of 1 V of Vac and 8 V of Vdc. |
| Databáze: | OpenAIRE |
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