Direct‐Write Laser Patterning of PDMS/Graphite Composites for Dual‐Functional Surfaces with Tunable Conductivity and Wettability

Abstract A novel approach is presented for creating multifunctional polydimethylsiloxane (PDMS) surfaces through the integration of PDMS/graphite composites with blue laser‐induced transformations. By systematically varying graphite concentration (0–10 wt.%) and laser power (740 mW – 2 W), precise control over surface properties is achieved, enabling tunable electrical conductivity (1–1000 kΩ sq −1 ) and wettability (contact angles 5°–145°). Compared to traditional infrared or UV laser systems, the blue laser method offers unique advantages through graphite‐enhanced selective heating, enabling precise surface modification with improved cost‐effectiveness. The resulting laser‐induced graphene (LIG) structures demonstrate exceptional stability due to graphite particles serving as anchoring points, successfully withstanding multiple cycles of adhesive tape peeling tests. The practical utility of this single‐step fabrication technique is demonstrated through a functional microfluidic chip capable of precise droplet manipulation through electrowetting. This facile, direct‐write approach provides a promising platform for applications in flexible electronics, microfluidics, and smart materials.