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

As a fundamental component in flexible systems such as wearable electronics and soft robots, the electrical stability of flexible resistors directly determines the overall reliability of the system. However, maintaining a stable resistance under coupled perturbations including pressure and fluctuations in temperature and humidity remains a major challenge. Herein, we report a flexible stable resistor in which a carbon nanocoil (CNC) film serves as the conductive framework, in which PDMS is infiltrated to form a composite film with continuous yet confined conductive pathways. This design effectively suppresses resistance drift induced by pressure, temperature, and humidity perturbations through a threefold synergistic mechanism involving conductive junction confinement, complementary thermal responses, and built-in hydrophobicity. The device maintains stable resistance under up to 50% compressive strain, exhibiting an ultralow pressure coefficient (<10^-4 kPa^-1) and a low temperature coefficient (2.4×10^-4°C^-1). Under coupled stimuli, the pressure-temperature coefficient is further reduced to 5×10^-6 (°C·kPa)^-1, and the resistance is essentially insensitive to humidity variations from 10% to 100% RH. Moreover, it exhibits good cycling stability and long-term operational stability. This material-structure synergistic strategy offers a promising route toward highly stable resistor devices for complex service environments and advances the development of reliable flexible electronic systems.