Abstract
A novel procedure for biopolymer surface nanostructuring with defined surface roughness and pattern dimension is presented. The surface properties of sputtered platinum layers on the biocompatible polymer poly(l-lactic acid) (PLLA) are presented. The influence of thermal treatment on surface morphology and electrical resistance and Pt distribution in ca. 100 nm of altered surface is described. The thickness, roughness and morphology of Pt structures were determined by atomic force microscopy. Surface sheet resistance was studied by a two-point technique. It was the sequence of Pt layer sputtering followed by thermal treatment that dramatically changed the structure of the PLLA’s surface. Depending on the Pt thickness, the ripple-like and worm-like patterns appeared on the surface for thinner and thicker Pt layers, respectively. Electrokinetic analysis confirmed the Pt coverage of PLLA and the slightly different behaviour of non-annealed and annealed surfaces. The amount and distribution of platinum on the PLLA is significantly altered by thermal annealing.
Highlights
Polymer-metal composites [1] are becoming an attractive subject because of their unique surface morphology and electric properties
We present a simple and cheap method for biopolymer surface nanostructuring by platinum nanostructure deposition and subsequent thermal annealing of the biopolymer surface
The transition to an electrically continuous layer was determined for the Pt layer deposited on pristine poly(L-lactic acid) (PLLA) and the same set of samples heated at 60°C (Figure 1)
Summary
Polymer-metal composites [1] are becoming an attractive subject because of their unique surface morphology and electric properties. They can be made on the base of polymeric films metalized from one or both sides with a noble metal (gold or platinum) [2,3]. These structures can be applied in many different parts of advanced electromechanical application, such as biomimetic robots [4] or actuators. The potential applications of polymer-metal nanocomposites and nanoparticles can be found in electronics or biomedical engineering [16,17,18,19,20,21,22]
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