The reinforced calcium alginate composites were synthesised by complexation reaction of calcium chloride (6 wt.%) and GO (1 wt. %) both dissolved in water under continuous stirring over 2 hours at 24°C, and subsequently mixing with a 2% (w/v in g/mL) aqueous solution of sodium alginate. The amount of each component were calculated to yield a composite composed of 6 wt.% of calcium chloride and 1 wt.% of GO both percentages are with respect to the mass of sodium alginate used in the preparation. Calcium alginate composites were also prepared with the same amount of graphene oxide and calcium cations but without following the complexation reaction to enable comparison. These composites are referred as cGO/Alg and GO/Alg respectively.