A Flexible Stable Resistor Robust Against Coupled Pressure-Temperature-Humidity Disturbances Enabled by a Carbon...

Area of Science:

• Materials Science
• Flexible Electronics
• Nanotechnology

Background:

• Flexible resistors are crucial for wearable electronics and soft robots.
• Maintaining stable electrical resistance under pressure, temperature, and humidity is a significant challenge.

Purpose of the Study:

• To develop a flexible resistor with enhanced stability under coupled environmental perturbations.
• To investigate a novel material-structure design for improved device reliability.

Main Methods:

• Fabrication of a composite film using carbon nanocoil (CNC) film infiltrated with PDMS.
• Investigating the synergistic mechanism involving conductive junction confinement, complementary thermal responses, and hydrophobicity.
• Testing device performance under various strains, temperatures, humidity levels, and cycling conditions.

Main Results:

• The flexible resistor demonstrated stable resistance up to 50% compressive strain with an ultralow pressure coefficient (<10^-4 kPa^-1).
• Achieved a low temperature coefficient (2.4×10^-4°C^-1) and a reduced pressure-temperature coefficient (5×10^-6 (°C·kPa)^-1).
• The device showed minimal resistance change across a wide humidity range (10%–100% RH) and exhibited excellent cycling and long-term stability.

Conclusions:

• The developed CNC-PDMS composite resistor offers exceptional stability against pressure, temperature, and humidity.
• This material-structure synergistic strategy provides a promising pathway for reliable flexible electronic systems in demanding environments.