Binder Free Modification of Glassy Carbon Electrode by Employing Reduced Graphene Oxide/ZnO Composite for Voltammetric Determination of Certain Nitroaromatics

作者：Mohammad Akbar; Ahmad Khursheed; Rajak Richa; Mobin Shaikh M

来源：Electroanalysis, 2018, 30(2): 274-282.

DOI：10.1002/elan.201700350

<jats:title>Abstract</jats:title><jats:p>Reduced Graphene oxide/ZnO nanoflowers (<jats:bold>rGO/ZnO‐NFs</jats:bold>) composite has been synthesized <jats:italic>in‐situ</jats:italic> using asymmetric Zn complex (<jats:bold>1</jats:bold>) as a single‐source molecular precursor (SSMP) with <jats:bold>GO</jats:bold> at 150 °C. The <jats:bold>rGO/ZnO‐NFs</jats:bold> composite was characterized by PXRD, UV‐<jats:italic>vis</jats:italic>, SEM, EDX mapping, TEM and SAED pattern to confirm its purity and morphology. The <jats:bold>rGO/ZnO‐NFs</jats:bold> composite shows uniform distribution of nanoflowers on graphene sheets. The modified glassy carbon electrode (<jats:bold>GCE</jats:bold>) was fabricated by drop wise layering of the <jats:bold>rGO/ZnO‐NFs</jats:bold> composite at the surface of the <jats:bold>GCE</jats:bold> without using binder. The binder free modified electrode (<jats:bold>GCE‐rGO/ZnO</jats:bold>) was explored for detection of nitroaromatics such as <jats:italic>p</jats:italic>‐nitro‐phenol (<jats:italic><jats:bold>p</jats:bold></jats:italic><jats:bold>‐NP</jats:bold>), 2,4‐dinitrophenol (<jats:bold>2,4‐DNP</jats:bold>), 2,4‐dinitrotoluene (<jats:bold>2,4‐DNT</jats:bold>) and 2,4,6‐trinitrophenol (<jats:bold>2,4,6‐TNP</jats:bold>). The fabricated sensor showed remarkable response for the both toxicants and explosives. The LOD, sensitivity and linear range for the studied toxicants and explosives were found to be in a good range: <jats:italic><jats:bold>p</jats:bold></jats:italic><jats:bold>‐NP=</jats:bold>0.93 μM, 240 μA mM<jats:sup>−1</jats:sup> cm<jats:sup>−2</jats:sup> and 0.2–0.9 mM; <jats:bold>2,4‐DNP=</jats:bold>6.2 μM, 203 μA mM<jats:sup>−1</jats:sup> cm<jats:sup>−2</jats:sup> and 0.1–0.9 mM; <jats:bold>2,4‐DNT=</jats:bold>10 μM, 371 μA mM<jats:sup>−1</jats:sup> cm<jats:sup>−2</jats:sup> and 0.2–0.9 mM; <jats:bold>2,4,6‐TNP=</jats:bold>16 μM, 514 μA mM<jats:sup>−1</jats:sup> cm<jats:sup>−2</jats:sup> and 0.2–0.9 mM, respectively.</jats:p>

• 出版日期2018-2