Interaction Behaviour of the Ultramicroporous Polymer Makrolon~reg; by Spectroscopic Methods

摘要

Makrolon~®, a commercially available polycarbonate with a glassy Ultramicroporous structure (mean pore-volume 0.1 nm~3), was often employed as sensitive layer for optical sensors in recent years. Due to the definite pore volume-distribution, it can be used as a size-selective sensitive layer. The interaction behaviour of Makrolon of different layer-thicknesses under the influence of methanol, ethanol and 1-propanol is characterized by Spectral El-lipsometry (SE), Surface Plasmon Resonance Spectroscopy (SPR) and Reflectometric Interference Spectroscopy (RIfS). Sorption into the polymer layer follows a superposition of Henry- and Langmuir-type behaviour; this was discussed depending on the size of the respective analyte. An adequate layer-thickness for the sensor methods RIfS and SPR is proposed.