Electrochemical Sensor: L-Cysteine Induced Selectivity Enhancement of Electrochemically Reduced Graphene Oxide–Multiwalled Carbon Nanotubes Hybrid for Detection of Lead (Pb2+) Ions
The selectivity improvement of Electrochemically reduced Graphene Oxide–Multiwalled Carbon Nanotubes–L-cysteine (ErGO–MWNTs–L-cys) nanocomposite modified Glassy Carbon Electrode (GCE) using drop casting method for electrochemical detection of lead (Pb2+) ions was investigated. Initially, the graphen...
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Frontiers Media S.A.
2020-03-01
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| Online Access: | https://www.frontiersin.org/article/10.3389/fmats.2020.00068/full |
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| author | Theeazen AL-Gahouari Theeazen AL-Gahouari Gajanan Bodkhe Pasha Sayyad Nikesh Ingle Manasi Mahadik Sumedh M. Shirsat Megha Deshmukh Nadeem Musahwar Mehendra Shirsat |
| author_facet | Theeazen AL-Gahouari Theeazen AL-Gahouari Gajanan Bodkhe Pasha Sayyad Nikesh Ingle Manasi Mahadik Sumedh M. Shirsat Megha Deshmukh Nadeem Musahwar Mehendra Shirsat |
| author_sort | Theeazen AL-Gahouari |
| collection | DOAJ |
| description | The selectivity improvement of Electrochemically reduced Graphene Oxide–Multiwalled Carbon Nanotubes–L-cysteine (ErGO–MWNTs–L-cys) nanocomposite modified Glassy Carbon Electrode (GCE) using drop casting method for electrochemical detection of lead (Pb2+) ions was investigated. Initially, the graphene oxide–Multiwalled Carbon Nanotubes–L-cysteine (GO–MWNTs–L-cys) nanocomposite was synthesized by a facile and cost-effective method at room temperature. The as-prepared, GO–MWNTs–L-cys exhibited good stable aqueous dispersions due to high hydrophilic nature of GO components which led to inhibiting the hydrophobicity of MWNTs. Then, the electrochemical conductivity of ErGO–MWNTs–L-cys nanocomposite modified GCE (ErGO–MWNTs–L-cys/GCE) was improved by the direct electrochemical reduction of GO–MWNTs–L-cys nanocomposite. The GO–MWNTs–L-cys nanocomposites and its individual components were characterized by Attenuated Total Reflection Infrared (ATR-IR), Ultraviolet–visible spectroscopy, Raman spectroscopy, Atomic Force Microscopy, and X-ray diffraction (XRD). The synergistic effect of ErGO–MWNTs–L-cys nanocomposite was confirmed by Cyclic Voltammetry (CV) and Electric Impedance Spectroscopy (EIS) measurements in [Fe(CN)6]3−/4− redox. Experimental parameters, such as pH, accumulation time and electrochemical reduction degrees, were optimized. Under optimal conditions, the electrochemical performance of modified electrodes toward Pb2+ ions was examined and it exhibited appreciable improvement at the ErGO–MWNTs–L-cys/GCE. In terms of applications, Differential Pulse Anodic Stripping Voltammetry (DPASV) was employed for the determination of Pb2+ ions on ErGO–MWNTs–L-cys/GCE. The calibration plots between anodic current and Pb2+ ions exhibited linear relationship in the range of 0.2–40 μgL−1 with the detection limit calculated to be 0.1 μgL−1 (S/N = 3). Finally, the ErGO–MWNTs–L-cys/GCE showed satisfied selectivity and stable results, and the Relative Standard Deviation (RSD) was calculated to be (RSD = 2.15%). |
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| spelling | doaj.art-79cb06d1e84d4f19b0a18897d110f3822022-12-21T19:20:47ZengFrontiers Media S.A.Frontiers in Materials2296-80162020-03-01710.3389/fmats.2020.00068518641Electrochemical Sensor: L-Cysteine Induced Selectivity Enhancement of Electrochemically Reduced Graphene Oxide–Multiwalled Carbon Nanotubes Hybrid for Detection of Lead (Pb2+) IonsTheeazen AL-Gahouari0Theeazen AL-Gahouari1Gajanan Bodkhe2Pasha Sayyad3Nikesh Ingle4Manasi Mahadik5Sumedh M. Shirsat6Megha Deshmukh7Nadeem Musahwar8Mehendra Shirsat9Department of Physics, RUSA Center for Advanced Sensor Technology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, IndiaDepartment of Physics, University of Aden, Aden, YemenDepartment of Physics, RUSA Center for Advanced Sensor Technology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, IndiaDepartment of Physics, RUSA Center for Advanced Sensor Technology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, IndiaDepartment of Physics, RUSA Center for Advanced Sensor Technology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, IndiaDepartment of Physics, RUSA Center for Advanced Sensor Technology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, IndiaDepartment of Electronics and Telecommunication Engineering, Jawaharlal Nehru Engineering College, Aurangabad, IndiaDepartment of Physics, RUSA Center for Advanced Sensor Technology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, IndiaDepartment of Physics, University of Aden, Aden, YemenDepartment of Physics, RUSA Center for Advanced Sensor Technology, Dr. Babasaheb Ambedkar Marathwada University, Aurangabad, IndiaThe selectivity improvement of Electrochemically reduced Graphene Oxide–Multiwalled Carbon Nanotubes–L-cysteine (ErGO–MWNTs–L-cys) nanocomposite modified Glassy Carbon Electrode (GCE) using drop casting method for electrochemical detection of lead (Pb2+) ions was investigated. Initially, the graphene oxide–Multiwalled Carbon Nanotubes–L-cysteine (GO–MWNTs–L-cys) nanocomposite was synthesized by a facile and cost-effective method at room temperature. The as-prepared, GO–MWNTs–L-cys exhibited good stable aqueous dispersions due to high hydrophilic nature of GO components which led to inhibiting the hydrophobicity of MWNTs. Then, the electrochemical conductivity of ErGO–MWNTs–L-cys nanocomposite modified GCE (ErGO–MWNTs–L-cys/GCE) was improved by the direct electrochemical reduction of GO–MWNTs–L-cys nanocomposite. The GO–MWNTs–L-cys nanocomposites and its individual components were characterized by Attenuated Total Reflection Infrared (ATR-IR), Ultraviolet–visible spectroscopy, Raman spectroscopy, Atomic Force Microscopy, and X-ray diffraction (XRD). The synergistic effect of ErGO–MWNTs–L-cys nanocomposite was confirmed by Cyclic Voltammetry (CV) and Electric Impedance Spectroscopy (EIS) measurements in [Fe(CN)6]3−/4− redox. Experimental parameters, such as pH, accumulation time and electrochemical reduction degrees, were optimized. Under optimal conditions, the electrochemical performance of modified electrodes toward Pb2+ ions was examined and it exhibited appreciable improvement at the ErGO–MWNTs–L-cys/GCE. In terms of applications, Differential Pulse Anodic Stripping Voltammetry (DPASV) was employed for the determination of Pb2+ ions on ErGO–MWNTs–L-cys/GCE. The calibration plots between anodic current and Pb2+ ions exhibited linear relationship in the range of 0.2–40 μgL−1 with the detection limit calculated to be 0.1 μgL−1 (S/N = 3). Finally, the ErGO–MWNTs–L-cys/GCE showed satisfied selectivity and stable results, and the Relative Standard Deviation (RSD) was calculated to be (RSD = 2.15%).https://www.frontiersin.org/article/10.3389/fmats.2020.00068/fullelectrochemical reductiongraphene oxidemultiwalled carbon nanotubesL-cysteinenanocompositeelectrochemical conductivity |
| spellingShingle | Theeazen AL-Gahouari Theeazen AL-Gahouari Gajanan Bodkhe Pasha Sayyad Nikesh Ingle Manasi Mahadik Sumedh M. Shirsat Megha Deshmukh Nadeem Musahwar Mehendra Shirsat Electrochemical Sensor: L-Cysteine Induced Selectivity Enhancement of Electrochemically Reduced Graphene Oxide–Multiwalled Carbon Nanotubes Hybrid for Detection of Lead (Pb2+) Ions Frontiers in Materials electrochemical reduction graphene oxide multiwalled carbon nanotubes L-cysteine nanocomposite electrochemical conductivity |
| title | Electrochemical Sensor: L-Cysteine Induced Selectivity Enhancement of Electrochemically Reduced Graphene Oxide–Multiwalled Carbon Nanotubes Hybrid for Detection of Lead (Pb2+) Ions |
| title_full | Electrochemical Sensor: L-Cysteine Induced Selectivity Enhancement of Electrochemically Reduced Graphene Oxide–Multiwalled Carbon Nanotubes Hybrid for Detection of Lead (Pb2+) Ions |
| title_fullStr | Electrochemical Sensor: L-Cysteine Induced Selectivity Enhancement of Electrochemically Reduced Graphene Oxide–Multiwalled Carbon Nanotubes Hybrid for Detection of Lead (Pb2+) Ions |
| title_full_unstemmed | Electrochemical Sensor: L-Cysteine Induced Selectivity Enhancement of Electrochemically Reduced Graphene Oxide–Multiwalled Carbon Nanotubes Hybrid for Detection of Lead (Pb2+) Ions |
| title_short | Electrochemical Sensor: L-Cysteine Induced Selectivity Enhancement of Electrochemically Reduced Graphene Oxide–Multiwalled Carbon Nanotubes Hybrid for Detection of Lead (Pb2+) Ions |
| title_sort | electrochemical sensor l cysteine induced selectivity enhancement of electrochemically reduced graphene oxide multiwalled carbon nanotubes hybrid for detection of lead pb2 ions |
| topic | electrochemical reduction graphene oxide multiwalled carbon nanotubes L-cysteine nanocomposite electrochemical conductivity |
| url | https://www.frontiersin.org/article/10.3389/fmats.2020.00068/full |
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