Structural and Physical Comparison Between CS/PVP Blend and CS/PVP/Sr-Hexaferrite Nanocomposite Films

Abstract

CS/PVP blend embedded by Sr-hexaferrite nanoparticles as a novel composite material to improve the optical and magnetic properties of composite samples. This work aimed to study and compare the functional and physical properties of CS/PVP film after and before adding SrFe12O19 with different weight percentages to form nanocomposite film with chemical formula CS/PVP/x Wt% SrFe12O19; x = 1, 3, 5 and 7. SrFe12O19 was prepared successfully by using citrate auto-combustion methods, then added to CS/PVP blend with different weight percentages. XRD shows the formation of Sr-hexaferrite in a single phase with an average crystallite size 44 nm. The semi-crystalline nature of CS/PVP film decreases with the addition of Sr-hexaferrite. FTIR displays the interaction between CS/PVP and SrFe12O19 by changing the intensity and broadening the OH band. HRTEM images show that SrFe12O19 has a rod structure and has average particle size ranging from 50 to 100 nm. The coercivity value increased by increasing the weight% of nanofiller as it increased from 421 Oe for SrFe12O19 to 4502.6 and 4488.2 Oe for x = 3 wt% and 7 wt% for SrFe12O19. The transition between the top of the valance band and the bottom of the conduction band in CS/PVP/ x Wt % SrFe12O19; x = 1, 3, 5, 7 system occurred through the indirect transition.