Abstract
Laser-induced graphene (LIG) from natural resources is a green, low-cost and eco-friendly nanomaterial, but its application is limited by the single-scale structure and inherent rigidity. In this work, cotton cloth is pre-carbonized and then embedded in polydimethylsiloxane (PDMS) elastomer to prepare silicon carbide/LIG (SiC/LIG) hybrids by laser scribing. The horizontal and vertical heat transfer in the carbonized cloth (CC) fiber network is distinguished by a self-established heat conduction theory and verified by a finite element analysis (FEA) model. The SiC/LIG nanosheets are distributed around CC fibers to form a core–shell structure, whose morphology and composition are adjusted by the laser fluence. The outer shell of SiC/LIG provides low surface energy and high specific surface area, while the inner core of CC ensures stable mechanical properties. The core–shell structure of SiC/LIG is coupled with the network structure of CC to form a three-dimensional (3D) hierarchical electrode with a water contact angle of 152.4° ± 2.5° and a water slide angle of 7.7° ± 2.5°. Following the “lotus effect”, the SiC/LIG electrode exhibits broad prospects in wearable electronics with static/dynamic superhydrophobicity, multiple contact-rebound behaviors, temperature/time wetting stability and self-cleaning properties.
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