Direct‐Write Laser Patterning of PDMS/Graphite Composites for Dual‐Functional Surfaces with Tunable Conductivity and Wettability
Journal
Advanced Materials Interfaces
ISSN
2196-7350
2196-7350
Date Issued
2025
Author(s)
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.
Subjects
direct-write patterning
laser-induced graphene (LIG)
polydimethylsiloxane (PDMS) composites
surface wettability control
Publisher
Wiley
Type
journal article