Effect of deep UV laser treatment on electroless silver precipitation in supported poly-3,4-ethylenedioxythiophene layers ♣
2009
Poly-3,4-ethylenedioxytiophene (PEDOT) polymer layers are electrodeposited on Pt substrates and irradiated with deep ultraviolet light. The 248.6 nm line of a UV Cu + laser is used. UV-treated and non-treated PEDOT samples are used for electroless silver precipitation carried out in a Ag-EDTA plating solution. The electroless metal deposition is studied as a function of the initial oxidation state of the polymer layers. A massive precipitation of metallic silver nanoparticles (10-40 nm) is observed in the case of reduced PEDOT. A larger amount of silver and a highly homogeneous distribution over the entire visible surface are found on the UV laser treated samples. The electroless precipitation in non-treated, oxidised PEDOT is sluggish and results in a non-uniform precipitation of Ag agglomerates (100-200 nm). The use of UV laser treated PEDOT layers in the oxidised state provokes a marked increase in the number of deposited Ag agglomerates and a uniform distribution over the polymer surface.
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