| 초록 |
We introduce a general and versatile approach for preparing the catalytic nanoparticle (NP)-coated graphene oxide (GO) nanosheets with extremely large catalytic surface area that can be well-dispersed in nonpolar, polar organic and aqueous media. Our approach is based on the high affinity between a variety of hydrophobic catalytic NPs stabilized by organic fatty acid or bulky ammonium ligands in nonpolar media and amine (NH2)-functionalized graphene oxide nanosheet in alcohol. On the other hand, additional coating of NH2-functionalized polymers onto hydrophobic NP-coated GO nanosheet induced high dispersion in alcohol and aqueous media. Particularly, in the case of GO nanosheets coated by Pd and Fe3O4 NPs, these nanocomposites exhibited the excellent catalytic performance in the oxidation of 3,3’,5,5’-tetramethylbenzidine (TMB) in aqueous media (i.e., nanosheets with NH2-functionalized outermost layer) and in the Suzuki-Miyaura coupling reaction in toluene (i.e., nanosheets with hydrophobic Pd NP outermost layer) allowing magnetically induced recycling stability. |
