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      https://www.ias.ac.in/article/fulltext/jcsc/133/0095

    • Keywords

       

      Pyrazine derivatives; Graphene Oxide; Z-scan Analysis; Optical Limiting; Two-Photon Absorption; Excited-State Absorption.

    • Abstract

       

      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.

    • Graphical Abstract

       

      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.

    • Author Affiliations

       

      E SHIJU1 N K SIJI NARENDRAN2 SHEENU THOMAS1 MEHBOOBALI PANNIPARA3 ABDULLAH G AL-SEHEMI3 D NARAYANA RAO4

      1. International School of Photonics, Cochin University of Science and Technology, Cochin 682022, India
      2. Department of Physics, T K M M College Nangiarkulangara, Alappuzha 690513, India
      3. Department of Chemistry, Faculty of Science, King Khalid University, Abha 61413, Saudi Arabia
      4. School of Physics, University of Hyderabad, Hyderabad 500046, India
    • Dates

       
  • Journal of Chemical Sciences | News

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