The high sensitivity stems from the interruption of conductive paths under a tiny change in strain, while the excellent stretchability requires the sensor to retain the conductive paths even under large deformations. However, there is always a trade-off between superior stretchability and high sensitivity because of conflicting structural requirements based on different principles. Resistive-type sensors made by depositing conductive filler networks on flexible and stretchable polymer substrates are promising contenders because of the synergy arising from the conductive nanofillers and stretchable polymer matrices. Much effort has been made to precisely convert mechanical stimuli to digital signals by improving the stretchability, sensitivity, linearity, and durability of stretchable sensors.
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Highly stretchable strain sensors, as indispensable components of wearable electronics, have attracted extensive interests in the fields of intelligent robotics, human–machine interface, human motion detection, and personal health-care monitoring system. This work proposes a unique approach to leveraging the inherent merits of two cross-influential anisotropic structures to resolve the trade-off among sensitivity, selectivity, and stretchability, demonstrating promising applications in full-range, multi-axis human motion detection for wearable electronics and smart robotics. The wrinkles generated through a pre-straining/releasing routine in the direction transverse to CNT alignment is responsible for exceptional selectivity of 6.3, to the benefit of accurate detection of loading directions by the multidirectional sensor. The transversely aligned CNT layer bridge the underlying longitudinal microcracks to effectively discourage their propagation even when highly stretched, leading to superior sensitivity with a gauge factor of 287.6 across a broad linear working range of up to 100% strain.
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The bilayer sensor consists of an aligned carbon nanotube (CNT) array assembled on top of a periodically wrinkled and cracked CNT–graphene oxide film. Here, an ultrasensitive, highly selective multidirectional sensor is developed by rational design of functionally different anisotropic layers.
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Although considerable efforts have been made to construct anisotropic structures for improved selective sensing capabilities, existing anisotropic sensors suffer from a trade-off between high sensitivity and high stretchability with acceptable linearity. Flexible multidirectional strain sensors are crucial to accurately determining the complex strain states involved in emerging sensing applications.