Valstybinis Moksliniu Tyrimu Institutas Fiziniu Ir Technologijos Mokslu Centras

Karolis Ratautas

Eugenijus Norkus

Aldona Jagminiene

Ina Stankeviciene

Gediminas Raciukaitis

Zilvinas Kancleris

Romualdas Trusovas

Justina Zemgulyte

Vytautas Vosylius

Rimantas Simniskis

Paulius Ragulis

This invention describes a process for selectively depositing metal on the surfaces of inorganic dielectric materials such as glass, ceramics, or semiconductor materials. The method enables the rapid and precise formation of electric circuits on both flat and three-dimensional surfaces. The production method includes steps: firstly, treatment of an item surface with an ultrashort pulse laser of the areas for metallisation, seconds step pre-treatment with the R—OH solution followed by metal salt catalyst activation in a bath and finally electroless metal plating. During immersion in the metal salt catalyst activation bath, localized R—OH molecules on the item's surface act as reducing agents, facilitating the reduction of metal ions from the activation bath. This results in the formation of catalytic seeds exclusively at the laser-modified areas. The metal layers exhibit high adhesion to the dielectric surface due to the formation of chemical bonds.

Method for selective metallisation of inorganic dielectrics or semiconductors

The present invention relates to a production of electro-conductive traces on the surface of polymeric articles using laser excitation for the areas to be metallised, followed by activation of the laser-treated areas with a metal salt solution, the article is later rinsed in distilled water, and the activated areas are metallised in the chemical plating bath. The aims of the invention are to produce cost-effective conductive traces of the circuits for the application in 3D moulded interconnect devices, to increase the quality of the circuit traces improving the selective metallization process. An irradiation dose and scanning parameters for the surface excitation are chosen experimentally, provided that a negative static charge appears on the surface of the laser-irradiated areas. The chosen parameters ensure that any surface degradation of the polymer is avoided. The activation solution used in the method is aqueous solution consisting of one chosen salt comprising: silver (Ag), copper (Cu), nickel (Ni), cobalt (Co), zinc (Zn), chrome (Cr), tin (Sn) salt.

Method for formation of electro-conductive traces on polymeric article surface

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Vilnius, Lithuania

Karolis Ratautas