A graphene-based resistive pressure sensor with record-high sensitivity in a wide pressure range

Area of Science:

• Materials Science
• Nanotechnology
• Sensor Technology

Background:

• Resistive pressure sensors are crucial for electronic skin (e-skin) applications.
• Existing sensors often show reduced sensitivity at higher pressures (>5 kPa), limiting practical use.
• A need exists for sensors maintaining high sensitivity across a broad pressure spectrum.

Purpose of the Study:

• To develop a flexible, wide-range, and ultra-sensitive resistive pressure sensor.
• To utilize laser-scribed graphene (LSG) with a unique foam-like structure for enhanced performance.
• To demonstrate the sensor's superiority over existing technologies.

Main Methods:

• Fabrication of a flexible pressure sensor using laser-scribed graphene (LSG).
• Characterization of the sensor's structure, focusing on graphene layer spacing and microstructure.
• Testing the sensor's sensitivity and response across a wide pressure range (0-50 kPa).
• Development and validation of a mathematical model for the LSG pressure sensor.

Main Results:

• The LSG pressure sensor exhibits a high sensitivity of 0.96 kPa⁻¹ within the 0-50 kPa range.
• The unique foam-like structure and v-shaped microstructure of LSG contribute to the enhanced performance.
• The developed sensor demonstrates superior sensitivity and range compared to previously reported pressure sensors.
• The established model accurately reflects the experimental findings.

Conclusions:

• Laser-scribed graphene pressure sensors offer a promising solution for advanced sensing applications.
• The developed sensor is ideal for artificial e-skin, medical sensing, and bio-sensing.
• This technology represents a significant advancement in flexible and wide-range pressure sensing.