A Thermal-Piezoresistive Self-Sustained Resonant Mass Sensor with High-Q (>95k) in Air

Aojie Quan, Chen Wang, Hemin Zhang, Michel De Cooman, Chenxi Wang, Linlin Wang, Sina Sadeghpour, Michael Kraft

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

8 Scopus citations

Abstract

This paper demonstrates, for the first time, a high sensitivity mass sensor based on thermal-actuation piezoresistive-detection coupled resonators with a self-sustained oscillation. In-plane-vibration resonators are actuated by thermal expansion and contraction of the nanobeams, while the vibration displacements are detected by changes in resistance. Due to the combination of the negative piezoresistive coefficient of the phosphorus-doped structural silicon layer and the thermal expansion/contraction effect, a constant direct current (DC) through the nanobeam produces a periodic resistance variation in the beam at the fundamental modal frequency as the resonator, thus a self-sustained oscillation is generated. An ultra-high quality factor of 95k in air is obtained. Linear response with respect to mass perturbations for both amplitude ratio (of the two coupled resonators) and frequency shift readouts are observed from the proposed self-oscillating, mode-localized mass sensor. The measured sensitivity of the amplitude ratio (162 ppm/pg) is 100 × higher than that of a shift in the normalized resonant frequency.

Original languageEnglish
Title of host publication21st International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages168-171
Number of pages4
ISBN (Electronic)9781665412674
DOIs
StatePublished - 20 Jun 2021
Externally publishedYes
Event21st International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2021 - Virtual, Online, United States
Duration: 20 Jun 202125 Jun 2021

Publication series

Name21st International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2021

Conference

Conference21st International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS 2021
Country/TerritoryUnited States
CityVirtual, Online
Period20/06/2125/06/21

Keywords

  • Coupled resonators
  • Mass sensor
  • Quality factor
  • Self-oscillation
  • Thermal-piezoresistive

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