4.6 Article

Modification of Polymeric Surfaces with Ultrashort Laser Pulses for the Selective Deposition of Homogeneous Metallic Conductive Layers

Journal

MATERIALS
Volume 15, Issue 19, Pages -

Publisher

MDPI
DOI: 10.3390/ma15196572

Keywords

polybutylene terephthalate; polyamide; picosecond laser; surface activation; palladium distribution; selective metallization

Funding

  1. MID Solution GmbH

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The demand for highly integrated and lightweight components has been rising sharply in recent years, specifically in plastics processing. This work presents a three-step laser-based process for subsequent selective metallization, enabling weight-saving solutions and eliminating the need for additional printed circuit boards (PCB) by directly developing conductive tracks on polymer surfaces.
In recent years, the demand for highly integrated and lightweight components has been rising sharply, especially in plastics processing. One strategy for weight-saving solutions is the development of conductive tracks and layouts directly on the polymer housing parts in order to be able to dispense with the system integration of additional printed circuit boards (PCB). This can be conducted very advantageously and flexibly with laser-based processes for functionalizing polymer surfaces. In this work, a three-step laser-based process for subsequent selective metallization is presented. Conventional injection molded components without special additives serve as the initial substrate. The Laser-Based Selective Activation (LSA) uses picosecond laser pulses to activate the plastic surface to subsequently deposit palladium. The focus is on determining the amount of deposited palladium in correlation to the laser and scan parameters. For the first time, the dependence of the metallization result on the accumulated laser fluence (F-acc) is described. The treated polymer parts are characterized using optical and scanning electron microscopy as well as a contact-type profilometer.

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