Smart Resonant Gas Sensor and Switch Operating in Air With Metal-Organic Frameworks Coating
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Mechanical Engineering Program
Advanced Membranes and Porous Materials Research Center
Chemical Science Program
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AbstractWe report a resonant gas sensor, uniformly coated with a metal-organic framework (MOF), and excited it near the higher order modes for a higher attained sensitivity. Also, switching upon exceeding a threshold value is demonstrated by operating the resonator near the bifurcation point and the dynamic pull-in instabilities. The resonator is based on an electrostatically excited clamped-clamped microbeam. The microbeam is fabricated from a polyimide layer coated from the top with Cr/Au and from the bottom with Cr/Au/Cr layer. The geometry of the resonator is optimized to reduce the effect of squeeze film damping, thereby allowing operation under atmospheric pressure. The electrostatic electrode is designed to enhance the excitation of the second mode of vibration with the minimum power required. Significant frequency shift (kHz) is demonstrated for the first time upon water vapor, acetone, and ethanol exposure due to the MOF functionalization and the higher order modes excitation. Also, the adsorption dynamics and MOF selectivity is investigated by studying the decaying time constants of the response upon gas exposure.
CitationJaber NR, Ilyas S, Shekhah O, Eddaoudi M, Younis MI (2017) Smart Resonant Gas Sensor and Switch Operating in Air With Metal-Organic Frameworks Coating. Volume 4: 22nd Design for Manufacturing and the Life Cycle Conference; 11th International Conference on Micro- and Nanosystems. Available: http://dx.doi.org/10.1115/DETC2017-67823.
JournalVolume 4: 22nd Design for Manufacturing and the Life Cycle Conference; 11th International Conference on Micro- and Nanosystems
Conference/Event nameASME 2017 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference, IDETC/CIE 2017