Crack resistance of bismuth ferrite films obtained on a flexible substrate

Shikhgasan Ramazanov,Anton Nazarov,Pavel Kaspar,Guseyn Ramazanov,Dinara Sobola,Ştefan Ţălu,Robert Macků,Farid Orudzev,Daud Selimov,A.D Nazarov

doi:10.1051/e3sconf/202129504008

Abstract

Ultrathin BiOx and FeOx layers were obtained by Atomic Layer Deposition (ALD) on the surface of a flexible Kapton substrate (poly (4,4’-oxydiphenylene-pyromellitimide)) at a temperature of 250 °C. The layer thickness was 50 - 100 nm. Surface morphology, electrical polarization, and mechanical properties were investigated by Atomic Force Microscope, Piezoelectric Force Microscopy and Force Modulation Microscopy. Chemical analysis was performed by X-ray Photoelectron Spectroscopy, where the formation of Bi2O3 and Fe2O3 phases, as well as intermediate phases in the Bi-Fe-O system, was observed. With a small increase in the Bi content of the film, the BFO / Kapton structure becomes more crack resistant. Modification of the Kapton surface with bismuth and iron oxides showed that such a composition exhibits multiferroic behavior.

Highlights

Kapton (poly (4,4'-oxydiphenylene-pyromellitimide)) was used as substrates for the growth of an amorphous film in the Bi-Fe-O system
The use of polymeric materials to modify the properties of bismuth ferrite and create hybrid materials based on it allows one to combine the mechanical superiority of polymeric materials and the electromagnetic properties of multiferroic
The films of Bi-Fe-O composition were prepared by atomic layer deposition (ALD) at ALDCERAM ML-200 device

Summary

Introduction

Kapton (poly (4,4'-oxydiphenylene-pyromellitimide)) was used as substrates for the growth of an amorphous film in the Bi-Fe-O system. The use of polymeric materials to modify the properties of bismuth ferrite and create hybrid materials based on it allows one to combine the mechanical superiority of polymeric materials (flexibility) and the electromagnetic properties of multiferroic. Such polymers as polyaniline (an example of a conductive semiconductor) or polyvinylidene fluoride (a piezopolymer) began to be widespread at modern technologies [14,15,16]. The mechanical properties of flexible structures based with BFO thin films can be controlled by adding dopants and changes in composition

Experimental Details

Results and Discussion

Conclusion