A Simple Method to Manufacture a Force Sensor Array Based on a Single-Material 3D-Printed Piezoresistive Foam and...

Area of Science:

• Materials Science
• Sensor Technology
• Additive Manufacturing

Background:

• 3D printing offers complex geometries for sensor manufacturing.
• Integrating multiple materials in 3D printing remains a significant challenge.
• Existing methods often require complex multi-material printing processes.

Purpose of the Study:

• To propose a simple method for fabricating multi-element resistive force sensors using single-material 3D printing.
• To overcome the challenge of material integration in 3D printed sensors.
• To enhance the feasibility of low-cost, high-performance sensor arrays.

Main Methods:

• A single conductive material was 3D printed to form the sensing element.
• Post-printing metal coating with a stencil was used to create electrically isolating lines.
• A lattice structure was incorporated to increase the metal-to-structure contact surface area.

Main Results:

• Successfully fabricated two distinct sensing elements from a single 3D printed structure.
• Achieved a maximum electrical isolation ratio exceeding 30 between the sensors.
• Demonstrated the effectiveness of the lattice structure in improving contact and isolation.

Conclusions:

• The proposed 3D printing and metal coating technique is a viable approach for creating multi-element resistive force sensors.
• This method offers a low-tech solution for fabricating complex sensor arrays.
• The findings pave the way for next-generation 3D printed force and displacement sensor arrays.