Direct Laser Writing Conductive Pattern on Microstructures Flexible Materials with Different Compositions

HSIANG-WEI CHUANG^1*, Hong-Ren Jiang¹

¹Institute of Applied Mechanics, National Taiwan University, Taipei, Taiwan

* Presenter:HSIANG-WEI CHUANG, email:oliver19990310@gmail.com

In recent years, flexible materials are used in microfluidic chip, strain sensing, and electronic skin. PDMS and other flexible materials are often used as substrates, so produce electrodes on these flexible substrates becomes important. In previous study using 405nm diode laser induced graphene on PDMS has been realized. This method provides one-step fabrication of graphene electrodes at ultraviolet(UV). However, due to the low absorption of PDMS, this method requires a high numerical aperture focusing lens. It makes this method more difficultly to set up.
In this work, we used 405nm diode laser to produce conductive pattern on microstructures PDMS/Graphite surface. Adding graphite can increase the PDMS absorption of laser energy, microstructures can protect and avoid electrode exfoliation. We also observed the SiO2 powders are produced during laser process and make the electrode superhydrophobic. Combining superhydrophobic and conductive properties we used this device to control the movement of water droplets by electrowetting.

Keywords: Laser Writing, Graphene, Superhydrophobic Electrode, Electrowetting