Conductive and Stretchable Adhesive Electronics with Miniaturized Octopus‐Like Suckers against Dry/Wet Skin for Biosignal Monitoring

Abstract

High adhesion and water resistance on skin surfaces are highly demanded properties for wearable and skin‐attachable electronics in various medical applications. Here, stretchable electronics with octopus‐like patterns (OPs) imprinted on a carbon‐based conductive polymer composite (CPC) film are presented. The bioinspired conductive suckers with dome‐like architectures are successfully exploited to sustain weight (500 g) in underwater, wherein this performance is known to be challenging. In addition, the artificial patch allows highly adhesive capabilities under both dry and wet conditions on various surfaces such as silicon (max. 5.24 N cm−2) and skin replica (max. 1.89 N cm−2) without contamination after detachment with an effortless peel‐off technique. The resulting device with low volumetric ratio of conductive carbon black presents sensitive and reliable piezoresistive responses to lateral strain and vertical pressure. By controlling the ratio of the carbon nanoplatelets in the polymeric matrix, electronic patch demonstrates both detection of electrocardiogram (ECG) and bending motions of wrist in dry and wet environments. Based on the characteristics shown in this work, the proposed electronic patch is a promising approach to realize wearable and skin‐attachable sensor devices for in vitro and in vivo monitoring of various biosignals.

Advanced Soft Materials, Sensor Integrations, and Applications of Wearable Flexible Hybrid Electronics in Healthcare, Energy, and Environment

“…By focusing on adhesion mechanisms used in the animal kingdom, including well-known examples such as the gecko or octopus, wearable devices recorded vital signals even from wet skin while bypassing any toxicity induced by the currently used adhesives that are based on acrylic compounds. [202][203][204] One example includes stretchable electronics with octopus-like patterns imprinted on a carbonbased conductive polymer composite film (Figure 8c). [203] These bioinspired conductive suckers allow high adhesive capabilities under both dry and wet conditions on silicon (5.24 N cm −2 ) and skin replicas (1.89 N cm −2 ) without leaving behind residues after detachment, even with an effortless peel-off procedure.…”

“…Reproduced with permission. [203] Copyright 2018, Wiley-VCH. d) Kirigamiinspired structure (left) and its adhesion force (right) with a varying number of interconnects.…”

Multiscale Soft–Hard Interface Design for Flexible Hybrid Electronics

“…The composite with high carbon black (7 vol%) content was highly conductive and could serve as a wearable electrode for electrocardiogram monitoring. [218]…”

“…Reproduced with permission. [218] Copyright 2018, Wiley-VCH. seamless integration of devices and humans, such as attach-on integration, [219] print-on integration, [23] and weaving/knitting integration technologies.…”

Ultra‐Adaptable and Wearable Photonic Skin Based on a Shape‐Memory, Responsive Cellulose Derivative

“…In these wearable electronic or photonic sensors, their intimate coupling to the skin is of tremendous importance, as it determines the sensing quality, stability, and reliability while minimizing the motion artifact . However, a stable and robust adhesion to the skin is challenging, as the skin not only is a dynamic surface with low surface energy (25–29 mJ m −2 ) but also possess multiscale surface textures.…”