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In this study, bismuth (III) oxide (Bi 2 O 3 ) decorated graphene oxide (GO) nanocomposites were employed as novel radioprotective fillers in the epoxy matrix. Decoration of GO with Bi 2 O 3  would transform it as carrier for Bi 2 O 3  particles, thereby enhancing the thermo-mechanical and radiation shielding properties of the epoxy composites through effective filler distribution. Structural and compositional studies confirmed the successful decoration of Bi 2 O 3  on the surface of GO. Thereupon, epoxy composites containing decorated fillers at different loadings (5, 10 and 15 wt%) were synthesized using solution casting technique. The correlation between surface decoration and filler loading was systematically examined as function of thermo-mechanical, viscoelastic and radiation shielding properties of the composites. These nanocomposites displayed good thermal resistance (~ 450 °C), high glass transition temperature (~ 136 °C), elastic modulus (~ 4.36 GPa) and storage modulus, thereby confirming the improved dispersion and better interfacial adhesion in the composites. The formation of continuous filler network across epoxy matrix formed by decorated fillers significantly improved X-ray and γ-ray shielding properties of epoxy composites in the wide energy range of medical interest (30 – 1332 keV). Shielding efficiency of these lowly loaded BGO/epoxy composites were comparable with the composites containing Bi 2 O 3  nanoparticles alone and highly loaded microcomposites.

Bismuth (III) oxide decorated graphene oxide filled epoxy nanocomposites: thermo-mechanical and photon attenuation properties