TY - JOUR
T1 - Multimode MEMS Resonator for Simultaneous Sensing of Vapor Concentration and Temperature
AU - Jaber, Nizar
AU - Ilyas, Saad
AU - Shekhah, Osama
AU - Eddaoudi, Mohammad
AU - Younis, Mohammad I.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the King Abdullah University of Science and Technology. The associate editor coordinating the review of this paper and approving it for publication was Prof. Alper Bozkurt.
PY - 2018/10/1
Y1 - 2018/10/1
N2 - Most gas sensors suffer from the cross sensitivity to environmental temperature, which significantly reduces the accuracy and reliability of measurements. Current solutions require the fabrication of a thermometer in close proximity to the gas sensor or an identical reference sensor to compensate for the sensor drift due to temperature. This increases the device size, fabrication cost, and the power required to operate the sensor; and also adds to the complexity of the device circuit for signal processing. Here, we demonstrate a single resonant gas sensor, based on a microbeam uniformly coated with metal-organic frameworks (MOFs), capable of simultaneously measuring environmental temperature and gas concentration (water vapor). Using the electrostatic harmonic voltage, we actuate the microbeam simultaneously near the first and second vibration modes. The frequency shifts of these two modes due to physical stimuli changes are monitored in real time. The lower electrode of the clamped-clamped microbeam resonator is perforated to reduce the effect of squeeze film damping, thereby allowing operation under atmospheric pressure. We demonstrate experimentally the effectiveness of this technique to measure the environmental temperature and gas concentration. Based on the theoretical analysis and the Allan deviation results, a minimum detectable temperature of 0.03 °C and water vapor concentration of 4.6 ppm is demonstrated.
AB - Most gas sensors suffer from the cross sensitivity to environmental temperature, which significantly reduces the accuracy and reliability of measurements. Current solutions require the fabrication of a thermometer in close proximity to the gas sensor or an identical reference sensor to compensate for the sensor drift due to temperature. This increases the device size, fabrication cost, and the power required to operate the sensor; and also adds to the complexity of the device circuit for signal processing. Here, we demonstrate a single resonant gas sensor, based on a microbeam uniformly coated with metal-organic frameworks (MOFs), capable of simultaneously measuring environmental temperature and gas concentration (water vapor). Using the electrostatic harmonic voltage, we actuate the microbeam simultaneously near the first and second vibration modes. The frequency shifts of these two modes due to physical stimuli changes are monitored in real time. The lower electrode of the clamped-clamped microbeam resonator is perforated to reduce the effect of squeeze film damping, thereby allowing operation under atmospheric pressure. We demonstrate experimentally the effectiveness of this technique to measure the environmental temperature and gas concentration. Based on the theoretical analysis and the Allan deviation results, a minimum detectable temperature of 0.03 °C and water vapor concentration of 4.6 ppm is demonstrated.
UR - http://hdl.handle.net/10754/631312
UR - https://ieeexplore.ieee.org/document/8478213
UR - http://www.scopus.com/inward/record.url?scp=85054393285&partnerID=8YFLogxK
U2 - 10.1109/JSEN.2018.2872926
DO - 10.1109/JSEN.2018.2872926
M3 - Article
SN - 1530-437X
VL - 18
SP - 10145
EP - 10153
JO - IEEE Sensors Journal
JF - IEEE Sensors Journal
IS - 24
ER -