Nanostructured oxyspinel multilayers for novel high-efficient conversion and control
by I. Hadzaman; H. Klym; O. Shpotyuk
International Journal of Nanotechnology (IJNT), Vol. 11, No. 9/10/11, 2014

Abstract: Multilayered temperature-/humidity-sensitive thick-film p-i-p⁺ structures based on spinel-type semiconducting ceramics of different chemical composition (Cu_0.1Ni_0.1Co_1.6Mn_1.2O₄ with p⁺-type of electrical conductivity and Cu_0.1Ni_0.8Co_0.2Mn_1.9O₄ with p-type of electrical conductivity) and magnesium aluminate i-type MgAl₂O₄ ceramics, as well as temperature-sensitive p-p⁺ and p-p⁺-p structures were prepared and studied. It is shown that increasing the quantity of thick-film layers (from two to three) results in the improvement of the temperature sensitivity of thick-film structures. Humidity-sensitive thick films in one-layered form possess good linear dependence of electrical resistance on relative humidity without hysteresis in the range of 40-99%. Integrated p-i-p⁺ thick-film structures are stable in time and can be successfully applied for integrated environmental sensors. In addition, anomalous proton charge-transfer processes were studied for the first time in these p-i-p⁺ multilayers as a basis for novel electrical power sources, energy conversion and storage distinguished by high functional reliability, technological reproducibility and cost-effective synthesis route. A so-called aqueous-voltaic effect was revealed as electric motion force generation caused by orientation influence of electrical fields within separate p-i and i-p⁺ bilayers. This effect is strongly dependent on technical parameters of p-i-p⁺ nanostructure, reaching approximately 0.2 V for typical thick-film depths.

Online publication date: Wed, 14-Jan-2015

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