Fabrication of electrochemically reduced grapheme oxide composite based electrochemical sensor for the detection of 3-nitrophenol
In this research electrochemical sensor for the detection of 3-nitrophenol has been successfully developed based on electro-reduced graphene oxide (ERGO) functionalized with cyltrimethylammonium bromide (CTAB) and electro-reduced graphene oxide functionalized with poly(3,4-ethylenedioxythiophene)...
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| Format: | Thesis |
| Language: | English |
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2015
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| Online Access: | http://psasir.upm.edu.my/id/eprint/64516/1/FS%202015%2018.pdf |
| _version_ | 1825949823695585280 |
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| author | Muhammad, Nafiu |
| author_facet | Muhammad, Nafiu |
| author_sort | Muhammad, Nafiu |
| collection | UPM |
| description | In this research electrochemical sensor for the detection of 3-nitrophenol has been successfully developed based on electro-reduced graphene oxide (ERGO) functionalized with cyltrimethylammonium bromide (CTAB) and electro-reduced
graphene oxide functionalized with poly(3,4-ethylenedioxythiophene) (PEDOT) on screen printed carbon electrode (SPCE). Two methods of preparations were used.
Firstly, graphene oxide-CTAB was dropped cast onto the SPCE and later reduced using cyclic voltammetry technique to produce ERGO/CTAB. Secondly, ERGO/PEDOT was prepared by direct electrodeposition of mixture containing EDOT/GO in LiClO4 to produce PEDOT/ERGO on SPCE. The modified SPCE were characterized using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Raman
spectroscopy, scanning electron microscope (SEM) and energy dispersive X-ray (EDX), respectively. Their electrochemical activities and sensing capability towards 3-nitrophenol was investigated using linear sweep voltammetry (LSV). The modified SPCEs showed a remarkable activity which attributed to the excellent conductivity,
large surface area, electrocatalytic activity and good synergistic effect of the nanocomposite films toward 3-nitrophenol. To increase the sensitivity of the developed
sensors experimental parameters such as pH buffer, scan rate, accumulation time and potential were optimized. Under the optimum experimental conditions, the
ERGO/CTAB developed sensor displays two linear calibration curve in the concentration range of 0.5 and 100 μM with linear regression coefficients R2 = 0.9915
and 0.9972 and detection limit of 0.04 μM. While PEDOT/ERGO modified SPCE gave linear calibration curve in the concentration range from 0.3 to 70 μM with linear
regression equation y = 5.0042C (μM) + 45.674, R2 = 0.9934 and detection limit of 0.08 μM. The proposed methods showed good selectivity of target analyte even in
the presence of some foreign ions. A good reproducibility was recorded with RSD of 4.71% for ERGO/CTAB and 3.85 % for PEDOT/ERGO, respectively. |
| first_indexed | 2024-03-06T09:47:02Z |
| format | Thesis |
| id | upm.eprints-64516 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2025-02-19T02:46:39Z |
| publishDate | 2015 |
| record_format | dspace |
| spelling | upm.eprints-645162025-02-03T07:04:01Z http://psasir.upm.edu.my/id/eprint/64516/ Fabrication of electrochemically reduced grapheme oxide composite based electrochemical sensor for the detection of 3-nitrophenol Muhammad, Nafiu In this research electrochemical sensor for the detection of 3-nitrophenol has been successfully developed based on electro-reduced graphene oxide (ERGO) functionalized with cyltrimethylammonium bromide (CTAB) and electro-reduced graphene oxide functionalized with poly(3,4-ethylenedioxythiophene) (PEDOT) on screen printed carbon electrode (SPCE). Two methods of preparations were used. Firstly, graphene oxide-CTAB was dropped cast onto the SPCE and later reduced using cyclic voltammetry technique to produce ERGO/CTAB. Secondly, ERGO/PEDOT was prepared by direct electrodeposition of mixture containing EDOT/GO in LiClO4 to produce PEDOT/ERGO on SPCE. The modified SPCE were characterized using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Raman spectroscopy, scanning electron microscope (SEM) and energy dispersive X-ray (EDX), respectively. Their electrochemical activities and sensing capability towards 3-nitrophenol was investigated using linear sweep voltammetry (LSV). The modified SPCEs showed a remarkable activity which attributed to the excellent conductivity, large surface area, electrocatalytic activity and good synergistic effect of the nanocomposite films toward 3-nitrophenol. To increase the sensitivity of the developed sensors experimental parameters such as pH buffer, scan rate, accumulation time and potential were optimized. Under the optimum experimental conditions, the ERGO/CTAB developed sensor displays two linear calibration curve in the concentration range of 0.5 and 100 μM with linear regression coefficients R2 = 0.9915 and 0.9972 and detection limit of 0.04 μM. While PEDOT/ERGO modified SPCE gave linear calibration curve in the concentration range from 0.3 to 70 μM with linear regression equation y = 5.0042C (μM) + 45.674, R2 = 0.9934 and detection limit of 0.08 μM. The proposed methods showed good selectivity of target analyte even in the presence of some foreign ions. A good reproducibility was recorded with RSD of 4.71% for ERGO/CTAB and 3.85 % for PEDOT/ERGO, respectively. 2015-10 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/64516/1/FS%202015%2018.pdf Muhammad, Nafiu (2015) Fabrication of electrochemically reduced grapheme oxide composite based electrochemical sensor for the detection of 3-nitrophenol. Masters thesis, Universiti Putra Malaysia. Electrochemical analysis Phenols Electrochemistry - Graphene |
| spellingShingle | Electrochemical analysis Phenols Electrochemistry - Graphene Muhammad, Nafiu Fabrication of electrochemically reduced grapheme oxide composite based electrochemical sensor for the detection of 3-nitrophenol |
| title | Fabrication of electrochemically reduced grapheme oxide composite based electrochemical sensor for the detection of 3-nitrophenol |
| title_full | Fabrication of electrochemically reduced grapheme oxide composite based electrochemical sensor for the detection of 3-nitrophenol |
| title_fullStr | Fabrication of electrochemically reduced grapheme oxide composite based electrochemical sensor for the detection of 3-nitrophenol |
| title_full_unstemmed | Fabrication of electrochemically reduced grapheme oxide composite based electrochemical sensor for the detection of 3-nitrophenol |
| title_short | Fabrication of electrochemically reduced grapheme oxide composite based electrochemical sensor for the detection of 3-nitrophenol |
| title_sort | fabrication of electrochemically reduced grapheme oxide composite based electrochemical sensor for the detection of 3 nitrophenol |
| topic | Electrochemical analysis Phenols Electrochemistry - Graphene |
| url | http://psasir.upm.edu.my/id/eprint/64516/1/FS%202015%2018.pdf |
| work_keys_str_mv | AT muhammadnafiu fabricationofelectrochemicallyreducedgraphemeoxidecompositebasedelectrochemicalsensorforthedetectionof3nitrophenol |