Self-assembly of osmium complexes on reduced graphene oxide: A case study toward electrochemical chiral sensing

Abstract An electrochemical sensor was constructed via self-assembly of chiral metal complexes Λ-[Os(phen) 3 (ClO 4 ) 2 ] on reduced graphene oxide (rGO) sheet. Cyclic voltammetry and differential pulse voltammetry illustrate that the sensor could detect 1,1′-2-binaphthol lower than 10 μM. The response current of S-1,1′-2-binaphthol is 1.4 times higher than that of R-1,1′-2-binaphthol. A linear concentration range was attained for the response peak current. In comparison to clay/indium tin oxide substrate based chiral sensor, rGO has clearly enhanced the sensitivity of chiral sensing. Preliminary measurement indicates that the rGO/Λ-[Os(phen) 3 ] 2 + sensor can also be applied to determine compositions of a chiral mixture.