Specific Interface Capacitance of Nanocomposite Materials

Based on a model of interfaces existing between particles of different components, there is obtained the formula to estimate the capacitance of nanocapacitors spontaneously built in nanocomposite materials. The specific (per unit area) interface capacitance depends on the material’s characteristics such as: average width of the vacuum gap between the particles of two components, their dielectric constants, absolute values of the space charge average densities in components, and internal voltage corresponding to the difference of work functions of components. The electric capacitance associated with the internal interfaces can significantly affect electronic characteristics and, particularly, dielectric properties of nanocomposite materials.