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Piezoresistive Sensor Based on Micrographite-Glass Thick Films.

Osvaldo Correa¹, Pompeu Pereira de Abreu Filho², Stanislav Moshkalev²

¹Faculty of Electrical Engineering and Computing-FEEC, University of Campinas, Campinas 13083-852, SP, Brazil.

Sensors (Basel, Switzerland)

|May 20, 2022

Summary

A novel lead-free glass enables low-temperature fabrication of stable piezoresistive pressure sensors. This material ensures excellent repeatability and adherence for reliable sensor performance.

Keywords:

conductive paste glassy matrix micrographite particles piezoresistive material thick film

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Area of Science:

Materials Science
Sensor Technology

Background:

Development of lead-free glass materials for electronic applications.
Need for stable piezoresistive materials in pressure sensors.

Purpose of the Study:

To develop a new lead-free glass with a low sintering temperature for piezoresistive pressure sensors.
To investigate the properties and performance of micrographite-based piezoresistive films fabricated using this glass.

Main Methods:

Synthesis of a novel lead-free glass containing Bi2O3, B2O3, SiO2, Al2O3, and ZnO.
Fabrication of micrographite-based pastes and piezoresistive films using the developed glass.
Characterization of film adherence, micrographite distribution, and sensor performance under cyclic loading.

Main Results:

Achieved a low sintering temperature of 600 °C for the lead-free glass.
Successfully fabricated micrographite-based piezoresistive films with good adherence to alumina substrates.
Demonstrated excellent repeatability (within ±1%) and high stability of sensor response over 1000 load/release cycles.

Conclusions:

The developed lead-free glass is suitable for fabricating stable and reliable piezoresistive pressure sensors.
The low sintering temperature prevents degradation of graphitic material during fabrication.
The use of sodium carboxymethyl cellulose (NaCMC) ensures homogeneous distribution of micrographite particles and good film properties.