Graphene oxide: synthesis method and oxidation influence on the fluorescence characteristic times

The effect of oxidation (O_x) on the characteristic fluorescence times (τ₁, τ₂) of graphene samples is presented here. Graphene Oxide (GO) samples were synthesized by pyrolysis method. The O_x of the samples was estimated from 9.4 to 16.6 %, employing EDS. The τ₁ and τ₂ were measured by TRPL. Results revealed linear behavior in the τ₁(O_x) and τ₂(O_x) and these were attributed to radiative processes with impurities and the radiative transitions from to states; respectively. These results suggest that pyrolytic GO are excellent candidate materials to applications, as fluorescence bio-markers.