Effects of 3D Printing-Line Directions for Stretchable Sensor Performances

Area of Science:

• Materials Science
• Wearable Technology
• Biomedical Engineering

Background:

• Wearable health monitoring sensors are trending, but cost, durability, and performance remain challenges.
• Three-dimensional (3D) printing offers a potential solution by integrating conductive flexible materials like thermoplastic polyurethane (TPU).

Purpose of the Study:

• To evaluate the impact of 3D printing line directions on the performance of stretchable sensors.
• To explore the use of carbon nanotube/thermoplastic polyurethane (CNT/TPU) composites for wearable sensor applications.

Main Methods:

• Utilized fused filament fabrication (FFF) to create CNT/TPU sensors with varying print line directions (45°, 90°, 180°).
• Assessed sensor performance, stability (10,000 cycles), and reliability through repeated measurements.
• Demonstrated sensor capability in a real-world application: finger motion detection integrated into gloves.

Main Results:

• 3D printing line direction significantly affects sensor performance.
• Achieved outstanding sensor stability and reliability over extensive testing.
• Successfully demonstrated the practical application of the developed sensors for motion detection.

Conclusions:

• 3D printing of CNT/TPU composites is a viable method for creating high-performance, durable wearable sensors.
• Optimizing printing parameters, such as line direction, is crucial for enhancing sensor capabilities.
• This research contributes to advancing 3D-printed flexible conductive materials for health monitoring.