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Preparation of Laser‐Induced Graphene Fabric from Silk and Its Application Examples for Flexible Sensor

Laser‐induced graphene (LIG) with original macroscopic fabric structure, flexible characteristic, and minimum 40 Ω sq−1 sheet resistance is prepared by a two‐step method of heat treatment and laser direct writing (LDW) from a low‐cost and environmentally friendly silk fabric. The method can quickly control the electrical conductivity and mechanical properties of the product during processing. Laser parameters are adjusted by experiment to obtain an optimal about 40 Ω sq−1 sheet resistance. Finite element analysis (FEA) coupled with an experimental method is used to explain the relationship between processing, structure, and performance. Graphene can be detected on the upper and lower surface fibers of the thinner precursors under proper processing condition. The electrical conductivity of the product is influenced by material conversion and structural integrity caused by input laser energy, so it can be easily changed by adjusting laser processing parameters. The good performance of the product is related to uniform and sufficient but not excessive temperature field distribution. Moreover, the LIG fabric is also used in flexible sensors, for example, which have enough static and dynamic properties to be a wearable device.