Anisotropic delafossite-type CuFeO₂ thin films deposited by electrospinning with rotating collector

Abstract

Delafossite CuFeO₂ anisotropic thin films were prepared by electrospinning method with rotating collector. The pure phase CuFeO₂ anisotropic thin films were prepared by heat treatment at 773 K in the air for 600 s and 1023 K under nitrogen for 600 s. Besides, an electrospinning process rotation speed influence on the CuFeO₂ film formation. The delafossite-type CuFeO₂ films were identified by X-ray diffraction and field emission scanning electronic microscopy. High-speed rotating collector were used to prepare the anisotropic thin film. Glass substrates were fixed on a rotating collector and rotated at speeds of 100–3000 rpm. The optical and electrical properties of the prepared CuFeO₂ thin film were measured by ultraviolet–visible spectrometry and two-point probe method, respectively. The electrical resistance of the macroscopically anisotropic CuFeO₂ thin films in the parallel and vertical directions showed a difference of 2–3 orders.