Origami-Inspired Conductive Paper-Based Folded Pressure Sensor with Interconnection Scaling at the Crease for Novel...

Area of Science:

• Materials Science
• Engineering
• Biomedical Engineering

Background:

• Wearable technology demands sensitive and robust pressure sensors.
• Origami principles offer a unique approach to structural design in sensors.
• Conductive paper substrates provide a flexible and cost-effective platform.

Purpose of the Study:

• To develop an origami-inspired pressure sensor using a conductive paper substrate.
• To investigate the relationship between folding, interconnection scaling, and sensor performance.
• To evaluate the sensor's sensitivity, stability, and potential medical applications.

Main Methods:

• Fabrication of a pressure sensor by face-to-face assembly of two screen-printed conductive paper substrates.
• Introduction of specific folds to optimize sensor structure and sensing area.
• Systematic analysis of Electrical Contact Resistance (ECR) across varying fold numbers and crease gaps.
• Strategic design modifications to enhance interconnection at creases.

Main Results:

• A notable trade-off was observed between the number of folds (sensing area) and Electrical Contact Resistance (ECR).
• Sensor performance reached a plateau with increased folding.
• Optimized interconnections at creases significantly enhanced sensor sensitivity and stability.
• Achieved remarkable sensitivity of 3.75 kPa^-1 at low pressure levels (0-0.05 kPa).

Conclusions:

• The origami-inspired pressure sensor on conductive paper demonstrates high sensitivity and stability.
• The sensor shows significant potential for diverse medical diagnostic applications, including bruxism detection, neck posture monitoring, and remote sensing of conditions like trigger finger.
• This technology paves the way for advanced, low-cost wearable diagnostic tools.