Surface electrical resistance along the interface of acid base hetero-contact using TiO2 or NiO substrate was measured at 20°C under controlled humidity. Humidity-sensitivity of acid TiO2 was suppressed by the contact with basic oxides and that of basic NiO was enhanced by the contact with an acid oxide. A model in which protons transfer from acid to basic surface by acid base interaction was proposed.
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Kubota et al. (1988) studied this question.