Abstract
Metallized polymer or polymer-based materials are used in a large range of electronics applications including the fabrication of ohmic contacts, chip-level interconnects, printed circuit boards and shielded materials.1–7 For such technological applications, electroless deposition is the most widely used method in practice today.8 Basically, electroless plating is an autocatalytic redox process occurring in aqueous solution between ions of the metal to be deposited (generally Ni or Cu) and a strong reducer. Typical procedures involve a variety of multi-step sequences for the preparation of the surfaces to be coated. Conventionally, substrates are cleaned with solvents to remove surface contaminants, chemically etched to obtain a micro-roughened oxidized surface, and then seeded with a catalyst such as palladium. Chronologically, the seeding process was first accomplished by using a two-step procedure involving substrate treatment successively in dilute SnC12 (sensitization step) and PdC12 (activation step) acidic solutions. Further, a one-step procedure using a colloidal suspension containing both Sn and Pd species (a SnC12/PdC12 acidic solution) has been developed and is presently in common use in industrial environments. In this last case, the Pd/Sn colloidal particles adsorbed on the polymer surface must be exposed (acceleration step) to a solubilizer (a HCl or NaOH solution) to remove the excess of Sn+2 species surrounding the catalytic Pd-based core of the colloidal particles. As can easily be inferred from the details of such multi-step procedures, it is today highly desirable to develop alternative approaches for making the insulating surfaces catalytically active. These approaches should require no chemical surface etching, reduce the number of process steps, and provide a highly selective, well-defined interaction between the catalytic species and the surface to be coated.9
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Romand, M., Charbonnier, M., Goepfert, Y. (2002). Plasma and VUV Pretreatments of Polymer Surfaces for Adhesion Enhancement of Electrolessly Deposited Ni or Cu Films. In: Sacher, E. (eds) Metallization of Polymers 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0563-1_16
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DOI: https://doi.org/10.1007/978-1-4615-0563-1_16
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