Micro-patterned plasma polymer films for bio-sensing

摘要

Bi-functional micro-patterned plasma polymer films were prepared by first depositing a full-area amino-containing plasma polymer film (PPF) onto a substrate, followed by the deposition of a patterned oxygen-containing PPF via a polymeric mesh used as contact mask. As a result, an ultrathin film with alternating areas of amine and oxygen-containing groups is obtained. Such micro-patterns bear potential as templates for multi-sensitive bio-sensor substrates. The chemical surface composition is assessed using XPS and ToF-SIMS. On the masked amino-rich area a lateral chemical micro gradient was observed due to mesh mask shadowing. Stability of the coating was investigated over time in ambient air and in water, showing that the surface properties were maintained after 7 days in air and 1 day in water. To demonstrate functionality, the micro-patterned surface was exposed to a green fluorescent protein (GFP) and lateral resolution and selectivity during adsorption was studied. (C) 2016 Elsevier Ltd. All rights reserved.