Electroless deposition of nickel on biocompatible poly(dimethylsiloxane) after a laser processing as a pretreatment

Stephan Armyanov1*, Eugenia Valova1, Konstantin Kolev1, Dragomir Tatchev1, Petar Atanasov2, Nadya Stankova2

1Institute of Physical Chemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria

2Institute of Electronics, Bulgarian Academy of Sciences, Sofia 1784, Bulgaria 

Adv. Mater. Lett., 2018, 9 (2), pp 101-106

DOI: 10.5185/amlett.2018.1818

Publication Date (Web): May 16, 2018

E-mail: armyanov@ipc.bas.bg

Abstract


Due to its biocompatibility poly(dimethylsiloxane) (PDMS) is an important material for the development of microelectromechanical systems or long-term, medical implants. The paper describes the morphology modifications and surface chemistry of PDMS during pulse laser treatment. SEM, μ-Raman spectroscopy, X-ray micro-tomography and XPS analyses are applied. PDMS decomposition takes place as a function of laser energy absorption. This leads to different oxidation degree of silicon, as shown by the curve fitting of Si 2p and O 1s. The irradiated parts become hydrophilic in contrast with the rest of the material, which remains hydrophobic. This is the condition enabling successful selective electroless deposition of Ni in the tracks, excluding the usual preceding sensibilization and chemical activation. This process is accomplished successfully after femtosecond laser irradiation and it is found that the time interval between laser treatment and metallization is not a critical parameter.

Keywords

Electroless nickel, poly(dimethylsiloxane) PDMS, laser treatment, XPS, Raman spectroscopy, FE SEM, X-ray micro-tomography.

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