5. Conclusions
The inhomogeneity of PS layer transforms significantly
the PL behaviour under the gas adsorption. For PL excited
by the long wavelength illumination, the quenching of
the intensity is observed under adsorption of acetone
molecules. At the excitation of the PL by the short
wavelength illumination, the photooxidation of surface
region of PS occurs in the ambient atmosphere. The acetone
adsorption on this top layer increases the PL yield,
whereas the PL of the inner layers is quenched. Thus,
the total PL incoming will be defined by the absorption
depth of the excitation and ratio of nonoxidised/oxidised
thickness of a porous film. This circumstance should
be considered in elaboration of PL gas sensors with
PS layers. On the other hand, the specific sensing of
the different PS sub-layers to the adsorbates can be
used to improve the selectivity of PL gas sensors.
abstract
1. Introduction
2. Experimental
3. PL of multilayer PS film:
simulation
4. PL of the inhomogeneous PS
film: Influence of The acetone adsorption
5. Conclusions
Captures for the figures
References
V.A.Skryshevsky
Radiophysics Department, Kiev Shevchenko
University,
64 Vladimirskaya, 01033, Kiev, Ukraine, fax.+380-44-2656744,
e-mail: skrysh@uninet.kiev.ua
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