A femtogram resolution mass sensor platform, based on SOI electrostatically driven resonant cantilever. Part I:...

Area of Science:

• Microelectromechanical Systems (MEMS)
• Nanotechnology
• Sensor Technology

Background:

• Microcantilever sensors offer high sensitivity for mass detection.
• Accurate modeling is crucial for optimizing sensor performance and understanding transduction mechanisms.

Purpose of the Study:

• To develop and validate an electromechanical model for a microcantilever-based mass detection platform.
• To characterize the sensor's performance, including mass responsivity, using the developed model.

Main Methods:

• Integration of a microcantilever in a silicon-on-insulator (SOI) substrate.
• Electrostatic excitation and capacitive detection of the cantilever's resonance mode.
• Development of a SPICE-implemented electromechanical model incorporating non-linearities.
• Fitting the model to measured frequency response data (S(21)) to extract sensor parameters.

Main Results:

• A functional microcantilever platform capable of femtogram-level mass detection was realized.
• An accurate electromechanical model was developed, accounting for non-linear effects.
• Key sensor parameters, including Young's modulus, Q factor, and mass responsivity, were successfully extracted.

Conclusions:

• The integrated microcantilever platform demonstrates significant potential for ultra-sensitive mass sensing.
• The validated electromechanical model provides a powerful tool for sensor design and performance analysis.
• This work advances the field of micro- and nanomechanical sensors for precision mass measurements.