Effect of Ratio Filled of -Fe2O3 on Microstructure and Magnetic Properties of Nano-sized Thin Film of -Fe2O3/MWNT/PVA

-Fe2O3-filled MWNT/PVA thin films were synthesized by dispersing -Fe2O3-MWNT in Sodium Dodecyl Sulfate (SDS) solvent with containing 10% of PVA solution and the samples were then naturally dried all night. -Fe2O3 was prepared from Iron nitrate (Fe(NO3)3.9H2O) with purity above 98.5% that already have been through the process of stirring for 27 hours at R.T. and annealing process at 160 °C for 5 hours in order to decompose the Fe(NO3)3.9H2O. The weight percentage variation of -Fe2O3 against the MWCNT is 1:1 and 1:7. The nano-sized thin films were analysed by Raman Spectroscopy, and Transmission Electron Microscopy (TEM), and then VSM measurement was performed for characterizing the magnetic property of the thin film. From the analysis of Raman Spectroscopy, all group theoretically predicted Raman-active of seven phonon modes (A1g (1), Eg (1), Eg (2), Eg (3), Eg (4), A1g (2), and Eg (5)) of -Fe2O3 were detected. The relative intensity of the A1g (1) mode and Eg mode (2) in ratio of 1:7 is higher than in ratio of 1:1. The MWCNTs bundles of D band around 1330 cm-1 and G band around 1610 cm-1 were also identified in both variation, 1:1 and 1:7 of the thin films, which proves the existence of -Fe2O3 on the MWCNT. Raman spectra of -Fe2O3 is more appear at a ratio of 1:1, which shows the success of the formation of a homogeneous thin films. TEM result showed the α-Fe2O3 inside the carbon nano tube with inner diameter of about 10 nm and outer diameter of about 25 nm, which also detected in the case of ratio 1:4 as reported by S. Purwanto, et al. The curve of VSM measurement result shows the magnetic hysteresis loops that indicating the presence of ferromagnetic spin ordering of α-Fe2O3. Sample with the ratio of 1:7 exhibited a little bit bigger hysteresis loop and high coercivity compared to the ratio of 1:1, where this result is consistent with the analysis result of Raman Spectroscopy that is marked by the increasing of the relative intensity of the A1g (1) mode and Eg mode (2) in ratio of 1:7.