Effect of disordered nanoporosity on electrical and thermal properties of layered Ca₃Co₄O₉ films

Independently controlling electronic and thermal transport in solids is a challenge, because these properties are coupled. Here, we show that disordered nanoporosity Ca3Co4O9 thin films can decrease the conductivity without significantly hampering transport. Scanning microscopy was used to determine out-of-plane estimate in-plane values. Nanoporous exhibit of 0.82 W m?1 K?1, which nearly twofold lower than obtained from nonporous films. room-temperature electrical resistivity 4 m? cm, comparable polycrystalline twice reported for single-crystal Ca3Co4O9. Our results suggest their degree disorder offer means decoupling materials.