PHOSPHINE SENSING MECHANISM IN CONDUCTING LANGMUIR-BLODGETT-FILMS BASED ON TETRACYANOQUINODIMETHANE AND ETHYLENEDITHIOTETRATHIOFULVALENE DERIVATIVES

This paper presents the results of X-ray photoelectron spectroscopy an d secondary ion mass spectrometry experiments performed to obtain info rmation about the sensing mechanism involved in the detection of phosp hine by conducting Langmuir-Blodgett (LB) films based on TCNQ and EDT- TTF derivatives. In contrast to the EDT-TTF based LB films, it is show n that with the TCNQ derivative the action of phosphine (PH3) results in the insertion of phosphine subproducts in the LB film. This informa tion is correlated with the general behaviour of each film towards pho sphine detection.