Graphene-based magnetic hybrid nanocomposite has the advantage of exhibiting better performance as platform or supporting materials to develop novel properties of composite by increasing selectivity of the targeted adsorbate. The hybrid nanomaterial was prepared by mixing and hydrolyzing iron (II) and iron (III) salt precursors in the presence of GO dispersion through coprecipitation method followed by in situ chemical reduction of GO. The effect of weight loading ratio of Fe to GO (4:1, 2.5:1, 1:1 and 1:4) on structural properties of the hybrid nanomaterials was investigated. The presence of characteristic peaks in FTIR spectra indicated that GO has been successfully oxidized from graphite while the decrease in oxygenated functional groups and peaks intensity evidenced the formation of hybrid nanomaterials through the subsequent reduction process. The presence of characteristic peaks in XRD pattern denoted that magnetite nanoparticles disappeared at higher loading of GO. TEM micrograph showed that the best distribution of iron oxide particles on the surface of hybrid nanomaterial occurred when the loading ratio of Fe to GO was fixed at 2:5 to 1. The reduced graphene oxide (RGO) sheets in the hybrid materials showed less wrinkled sheetlike structure compared to GO due to exfoliation and reduction process during the synthesis. The layered morphology of GO degrades at higher concentrations of iron oxide.Keywords: graphene, graphene oxide, surface modification, chemical co precipitation, magnetic nanoparticles Abstrak Nano komposit hibrid magnetik berasaskan grafin mempunyai kelebihan dengan mempamerkan prestasi yang lebih baik sebagai platform atau bahan sokongan untuk mengembangkan sifat-sifat baharu komposit dengan meningkatkan pemilihan bahan terjerap yang disasarkan. Bahan nano hibrid telah disediakan dengan mencampurkan dan menhidrolisasikan pemula garam ferum (II) dan ferum (III) ke dalam sebaran GO melalui kaedah mendakan kimia diikuti oleh pengurangan kimia GO secara in situ. Kesan nisbah muatan berat Fe ke GO (4: 1, 2.5: 1, 1: 1 dan 1: 4) terhadap sifat struktur bahan nano hibrid telah dikaji. Kehadiran puncak berciri dalam spektrum FTIR menunjukkan bahawa GO telah berjaya teroksida daripada grafit manakala penurunan dalam kumpulan berfungsi oksigen dan keamatan puncak membuktikan bahawa terdapat pembentukan bahan nano hibrid berikutan melalui proses pengurangan. Kehadiran puncak berciri dalam corak XRD menandakan bahawa nano zarah magnetit hilang apabila muatan GO lebih tinggi. Mikrograf TEM menunjukkan bahawa pengagihan zarah ferum oksida yang terbaik di atas permukaan bahan nano hibrid berlaku apabila nisbah muatan berat Fe ke GO ditetapkan pada 2: 5 ke 1. Kepingan grafin oksida yang melalui proses pengurangan (RGO) dalam bahan hibrid menunjukkan struktur kedutan yang berkurang berbanding GO disebabkan oleh proses pengelupasan dan pengurangan semasa sintesis. Lapisan morfologi GO berkurang pada kepekatan ferum oksida yang lebih tinggi.

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