Bioinspired Interface-Guided Conformal Janus Membranes with Enhanced Adhesion for Flexible Multifunctional Electronics

Abstract

The realization of conformal and reliable adhesion on textured surfaces has drawn considerable interest for precise and stable monitoring of diverse motion behaviors. However, it still remains a challenge for the achievement of skinlike membranes with favorable conformality and adhesion features in a facile and efficient way. In this work, we propose an interface-enabled approach to develop elastic and conductive Janus membranes with a controllable partially cured elastomeric layer for high conformity and adjustable adhesive property. The Janus membrane on the water surface can be readily transferred onto the targeted planar and nonplanar surfaces for final complete curing with improved adhesion. The achieved membrane can be integrated into wearable conformal electronics to effectively detect and differentiate the forward/reverse deformation of fingers with high signal stability. Moreover, it can highly adapt to the hierarchically creased paper surface for the real-time detection of the paper-folding behavior. Inspired by the wrinkled structure of the elephant trunk, an artificial wrinkled trunk was designed for motion detection. The conformal membrane on the wrinkled trunk can experience reversible contacted and/or stretched state for trunk motion behavior detection.

Carbon-Based Janus Films toward Flexible Sensors, Soft Actuators, and Beyond

“…The asymmetric surface micro/nanostructures (e.g., micropatterns, conformal wrinkles) can be imparted to pristine carbon films by an interfacial asymmetric transfer strategy, enabling remarkable performance enhancement in sensing and actuating devices. , Besides, the semi-embedded structures with the in situ composite strategy confer asymmetric conductivity and excellent mechanical properties to the Janus film. Meanwhile, the elastomer side retains superior adhesion and hydrophobicity, demonstrating significant potentials in underwater sensors and actuators in a self-supported form without any encapsulation or superhydrophobic treatment. , Moreover, the postcuring procedure of the elastomer enables easy transfer onto diverse target substrates in a semicured state for stable flexible electronics with superconformal adhesion …”

“…45,46 Moreover, the postcuring procedure of the elastomer enables easy transfer onto diverse target substrates in a semicured state for stable flexible electronics with superconformal adhesion. 47…”

Multifunctional polyimide-based femtosecond laser micro/nanostructured films with triple Janus properties

“…For example, Xu et al 53 designed a Janus wound dressing by assembling external hydrophobic adhesive tape, filter paper, and a polydimethylsiloxane Janus film which can unidirectionally remove biofluids away from the wound bed. Wang et al 54 proposed elastic and conductive Janus membranes achieved by an interface-enabled approach, which can be integrated into wearable conformal electronics to effectively detect and differentiate the forward/reverse deformation of fingers with high signal stability. Nevertheless, most production methods are relatively complex, and more functionality is needed.…”

Mechanical Janus Structures by Soft–Hard Material Integration

“…[ 29,30 ] However, most of these Janus structures are designed at the nanoscale with distinct physical or/and chemical properties on opposite faces, and challenge the fabrication accuracy, efficiency, and cost. [ 31–33 ] Besides, a bulk, even sometimes 3D, form of Janus structures at a large scale is usually necessary for most applications in flexible electronics, [ 34–36 ] superstructural membranes and films, [ 37–39 ] and optical and thermal devices. [ 40,41 ]…”

“…[29,30] However, most of these Janus structures are designed at the nanoscale with distinct physical or/and chemical properties on opposite faces, and challenge the fabrication accuracy, efficiency, and cost. [31][32][33] Besides, a bulk, even sometimes 3D, form of Janus structures at a large scale is usually necessary for most applications in flexible electronics, [34][35][36] superstructural membranes and films, [37][38][39] and optical and thermal devices. [40,41] Bio-inspired design offers an efficient and effective strategy for material and structural design at different scales, in particular toward functionalities that often surpass individual components.…”