CAPACITANCE EFFECTS AND GASEOUS ADSORPTION ON PURE AND DOPED POLYCRYSTALLINE TIN OXIDEстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Conductance and capacitance effects have been studied simultaneously on thin films and ceramics of tin oxide by using d.c. conductance and impedance measurements. Pure SnO2 and SnO2-CuO composite materials were studied. The total resistance of the samples is mainly due to the grain boundaries and the adsorption on these boundaries of gaseous species with high dielectric constant as ethanol leads to a high capacitance value. This capacitance effect is more important in ceramics than in thin films. n-type SnO2-p-type CuO composite materials exhibit particular capacitance and conductance responses under pollutant gas, due to n-p junctions at the SnO2-CuO interfaces.