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The effect of adsorbed electron donor (ammonia, alcohols, water) and electron acceptor (molecular hydrogen, dichlorobutene, chloroform) molecules on the conductivity of polymeric nanocomposites, representing poly( p -xylene) containing metal (lead, copper, or palladium) nanoparticles (∼10 nm in size), was studied as dependent on the metal content and the gas or vapor pressure at room temperature. It was found that the conductivity significantly (up to eight orders of magnitude) increases due to the adsorption of electron donor molecules and decreases upon the adsorption of electron acceptors. A mechanism of the sensor response is proposed according to which the adsorption simultaneously changes the fractal characteristics of the nanocomposites and the electron work function of metal nanoparticles.
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Григорьев et al. (2002) studied this question.
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