• D NARAYANA RAO

      Articles written in Journal of Chemical Sciences

    • Pyrazines with terminal donor groups for third-order nonlinear optics: effect of graphene oxide on nonlinear absorption

      E SHIJU N K SIJI NARENDRAN SHEENU THOMAS MEHBOOBALI PANNIPARA ABDULLAH G AL-SEHEMI D NARAYANA RAO

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      We report nonlinear optical (NLO)investigations of few pyrazines with terminal donor groups and theinfluence of graphene oxide (GO) on their nonlinear absorption (NLA) under the nanosecond (ns) pulse excitation.We have used Z-scan and Degenerate Four-Wave Mixing (DFWM) techniques for the NLO investigations and a Qswitched Nd:YAG laser (532 nm, 7 ns, 10 Hz) was used as the source of excitation.Modified Hummers method wasused for synthesizing GO. A significant quenching in the fluorescence intensity of the pyrazine derivatives wasobserved when incorporating GO and it suggests the interaction between GO and pyrazine moieties throughelectron/energy transfer. The pyrazines/GO composites showed strong NLA and it is better than that of the parentcompounds. The mechanism behind the NLA is found to be two-photon absorption (TPA) along with excited-stateabsorption (ESA) and the significant enhancement in the NLA activity of composites can be attributed to thephotoinduced electron and/or energy transfer between the GO and pyrazine moieties.

      Nonlinear optical analysis of few pyrazines with terminal donor groups and the influence of graphene oxide on their nonlinear absorption under the nanosecond pulse excitation is reported. Nonlinear absorption and optical limiting activity is found to be significantly enhanced as a result of composite formation and it is attributed to the photoinduced charge/energy transfer between two systems.

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