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The device for measurement the conductivity of polymer microfibers
T.E. Osmanov, I.V. Yaminsky
Faculty of Physics, MSU, Leninskie gory, Moscow, Russia
Institute of Organoelement Compounds, RAS, Moscow, Russia
E-mail: osmanov@polly.phys.msu.ru

Electric properties of polymer micro and nanofibers are practically not
investigated. Such fibers are characterized by a high surface/volume ratio.
They reveal good abilities to adsorb low-molecular substances. Composite
fibers with metal inclusions are of special interest for the catalysis
chemistry.
We have constructed a precise device for the measurement of electric
resistance of polymeric fibers. It is based on the FemtoScan scanning probe
microscope and reveals several advantages: experiments can be performed in
the environmental chamber using different adsorbates and at various
temperatures. The temperature inside the chamber is controlled by
thermistor, which acts also as a heater. The device allows to observe
adsorption of different gases by the microfiber and to find its dependency
upon temperature.
Electric resistance of the polyacrylnitril (PAN) fiber with diameter from
20 up to 40 nanometers is measured. |The dependence of the conductivity of
PAN upon temperature and humidity of air is found; irreversible changes of
a fiber conductivity are registered during the electrical current passage.

The application of the device for studying gas-hydrates is proposed. It is
possible to watch for adsorption by tracing changes of electrical
resistance.
The support of the Russian Foundation for Basic Research (project N 04-03-
32472) and Russian Academy of Sciences (Program "Chemistry and
physchemistry of supramolecular systems and atomic clusters") is
acknowledged.