|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Functional Nanomaterials: Functional Low-Dimensional (0D, 1D, 2D) Materials 2022
||Spatial Control of Laser Induced Graphene Morphology on Flexible Substrates
||Moataz Abdulhafez, Golnaz Tomaraei, Ki-Ho Nam, Mostafa Bedewy
|On-Site Speaker (Planned)
Laser induced graphene (LIG) is an emerging technique that enables directly patterning conductive carbon electrodes for a plethora of flexible devices, including supercapacitors and sensors. Here, we present a new method for creating functionally graded LIG based on utilizing controlled gradients of optical energy flux to create spatial gradients of LIG morphologies having different electrical conductivities. Importantly, we demonstrate the seamless transition between neighboring regions having different porosity and conductivity. We developed a method to continuously sweep laser fluence = values by controlling the defocus level of the sample surface. This sweeping method enabled identifying the precise fluence thresholds that correspond to morphological transitions. Hence, our results provide new insights into the fluence-dependence of the physicochemical processes underlying LIG formation. Our approach enables generating a morphology diagram for LIG, which facilitates precise tunability of both the morphology, electrical and electrochemical properties of LIG patterns, based on easy-to-control processing parameters.