POLYSILOXANES FOR LANGMUIR-BLODGETT APPLICATIONS

Polysiloxanes were functionalized for Langmuir-Blodgett (LB) depositio n of films for optical and bioelectronic applications. Azo dye chromop hores give second-harmonic generation and phosphatidylcholine (PC) sid e-groups yield bilayers suitable for inclusion of active proteins. The polymeric forms are better LB materials than their low molecular mass analogues. One of the azo dye functionalized polymers forms LB films of exceptional clarity; waveguide losses for 633 nm light were measure d at around 2.5 dB cm-1 in a 1.3 mum thick film. Bilayers of the PC fu nctionalized polymer have low-field conductivities of the order of 10( -9) S m-1, with a transition to a probable space-charge-limited region and eventual breakdown at above 1.5 x 10(-8) V m-1. Absorption measur ements indicate that bacteriorhodopsin remains active when mixed with the PC functionalized polymer.