Self-assembling and coordination of water nano-layers on polymeric coated long period gratings as promising tool for cation detection
2010
In this work, polymeric coated Long Period Gratings (LPGs) working in transition mode have been used to
monitor the coordination and self assembling of water nano layers providing new scenarios in chemical sensing
applications. In particular, nano-scale layers of syndiotactic and atactic polystyrene (sPS and aPS) have been deposited
by dip - coating onto LPGs to tune the devices at the transition point. Experimental results demonstrate
the polymers capability to orient water molecules in proximity of their surfaces. The sPS and aPS interactions
with water have been compared. Moreover, the high sensitivity of the coated LPGs was used to monitor the
effect of disorder induced by different cations depending on their size and electrical charge. Experimental results
show for the first time that, thanks to the water - polymer interaction, sPS coated LPGs could be successfully
employed as high sensitivity cation sensors.
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