Strain-Insensitive Pressure Sensing Mechanism Enabled by Dissimilar Materials with Highly Contrasting Properties
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Stretchable pressure sensors face a critical challenge where mechanical strain interferes with pressure sensingaccuracy, limiting their practical deployment in wearable electronics and soft robotics. This paper presents a novel strain-insensitivepressure sensing mechanism enabled by dissimilar materials with highly contrasting properties. The sensor employs a highlystretchable elastomer as the overall substrate and CNT-dispersed elastomer with relatively higher modulus at sensing points, creatinga configuration where strain occurs only in the periphery while sensing regions remain mechanically stable. Liquid metal electrodesenable signal transmission without distortion under mechanical deformation. Material characterization revealed that liquid metalexhibits negligible resistance changes under strain, while CNT-based conductive polymers demonstrate significant piezoresistiveresponses to pressure. Performance evaluation under simultaneous strain and pressure conditions verified consistent piezoresistiveproperties regardless of applied strain levels, validating the strain-insensitive mechanism. The fabrication process utilizes simplemolding, coating, and patterning techniques with readily available materials, making it highly suitable for mass production. Thisapproach enables accurate pressure measurements in dynamic environments while maintaining excellent mechanical robustness,opening pathways for advanced tactile sensing applications in prosthetics, human-machine interfaces, and soft robotics, where bothspatial resolution and strain insensitivity are essential.
Abstract
Stretchable pressure sensors face a critical challenge where mechanical strain interferes with pressure sensingaccuracy, limiting their practical deployment in wearable electronics and soft robotics. This paper presents a novel strain-insensitivepressure sensing mechanism enabled by dissimilar materials with highly contrasting properties. The sensor employs a highlystretchable elastomer as the overall substrate and CNT-dispersed elastomer with relatively higher modulus at sensing points, creatinga configuration where strain occurs only in the periphery while sensing regions remain mechanically stable. Liquid metal electrodesenable signal transmission without distortion under mechanical deformation. Material characterization revealed that liquid metalexhibits negligible resistance changes under strain, while CNT-based conductive polymers demonstrate significant piezoresistiveresponses to pressure. Performance evaluation under simultaneous strain and pressure conditions verified consistent piezoresistiveproperties regardless of applied strain levels, validating the strain-insensitive mechanism. The fabrication process utilizes simplemolding, coating, and patterning techniques with readily available materials, making it highly suitable for mass production. Thisapproach enables accurate pressure measurements in dynamic environments while maintaining excellent mechanical robustness,opening pathways for advanced tactile sensing applications in prosthetics, human-machine interfaces, and soft robotics, where bothspatial resolution and strain insensitivity are essential.