Tuning optical, dielectric, and electrical properties of Carboxymethyl cellulose (CMC) doped with Cobalt ferrite (CoFe2O4) nanoparticles via laser ablation for flexible electronic devices

Abstract

Studying a series of Carboxymethyl cellulose (CMC)/Cobalt ferrite (CoFe2O4) films with different content of Cobalt ferrite (CoFe2O4). By using a pulsed laser ablation approach, the CoFe2O4 was implanted into the CMC polymeric material. The synthesized nano-films have been examined via XRD, FESEM, and FTIR besides thermal, electrical, and optical examinations. FESEM illustrations clearly show that size reduction is accelerated by increasing the laser irradiation period to 20 min. The CMC/CoFe2O4 polymeric film with a laser irradiation time of 5 min demonstrates an average grain size ∼1.75 µm, while with t = 20 min it was ∼ 0.25 µm. Thermal behavior demonstrates introducing higher thermal stability with raising cobalt ferrite ratio. Moreover, the activation energy was 151.93 kJ mol−1 for t = 0.0 min, while becomes 167.66 kJ mol−1 at t = 10.0 min, Then it dropped into 160.12 kJ mol−1 at t = 20.0 min. The notable raising in E * firstly is owing to complexation tendency, while the density of the H-bond leads to activation energy dropping at t = 20 min. Optical behavior shows a decline in absorption edge from 5.4 e.V at t = 0.0 min to 4.8 e.V at t = 10, 20 min. The change in dielectric constant (ε′) by increasing frequencies upon cobalt ferrite content variation provokes a great development for the electrical behavior of the studied compositions.