Graphene oxide sheets decorated by silver nanoparticles were synthesized according to a modified version of a common two-phase system [13]. Firstly, graphite oxide powder (20mg) was dispersed in water (30mL) by sonication for 2 h to form a stable graphene oxide colloid following AgNO3 (0.03 M) was added in and then the colloid was combined with 20 mL of a toluene solution of phase transfer agent cetyl trimethylammonium bromide (0.4M) and vigorously stirred for 6 h. The organic phase,
which contained graphene oxide sheets and silver ions, were isolated from the aqueous phase by phase separation and150 mL of 1-dodecanethiol was added. After the mixture was stirred for 15 min,the silver ions were reduced by introduction of 24 mL of an aqueous solution of NaBH4 (0.43 M) and then stirred for 24 h. The organic phase was isolated from the aqueous phase by phase separation. The product was washed in excess ethanol and acetone to remove the residual phase transfer catalyst and unbound thiol in the organic phase. The final product is graphene oxide sheets decorated by silver naoparticles.