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Amperometric detection of nitrite using Co3O4 thin film
Author(s)
Ndala, Ariel Mpukuta
Date Issued
2021
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
In this MSc thesis, Co3O4 thin film was prepared by metal-organic decomposition on FTO
substrate and hydrothermal treatment in the presence of L-Arginine. The conditions for
hydrothermal treatment were optimized with respect to time, temperature, L-Arginine
concentration, and pH. The L-Arginine-treated Co3O4 thin film (L-Arginine/Co3O4/FTO) was used
for the electrochemical detection of nitrite under neutral pH condition. Several physical (i.e., XRD,
XPS, SEM, and Raman spectroscopy) and electrochemical (i.e., CV, CA, and EIS) techniques
were used to elucidate the role and effect of L-Arginine on Co3O4 film as well as to determine the
sensor performance. It is demonstrated that the L-Arginine-treated electrode exhibited enhanced
electrochemical nitrite detection compared to pristine Co3O4 electrode. The proposed nitrite
sensor also showed a combination of ultralow limit of detection (1.95 nM), fast response time (<
2 s), wide linear range (10 – 16 000 μM), high sensitivity (158 μM/mM.cm-2) and selectivity
compared to the reported literature.
substrate and hydrothermal treatment in the presence of L-Arginine. The conditions for
hydrothermal treatment were optimized with respect to time, temperature, L-Arginine
concentration, and pH. The L-Arginine-treated Co3O4 thin film (L-Arginine/Co3O4/FTO) was used
for the electrochemical detection of nitrite under neutral pH condition. Several physical (i.e., XRD,
XPS, SEM, and Raman spectroscopy) and electrochemical (i.e., CV, CA, and EIS) techniques
were used to elucidate the role and effect of L-Arginine on Co3O4 film as well as to determine the
sensor performance. It is demonstrated that the L-Arginine-treated electrode exhibited enhanced
electrochemical nitrite detection compared to pristine Co3O4 electrode. The proposed nitrite
sensor also showed a combination of ultralow limit of detection (1.95 nM), fast response time (<
2 s), wide linear range (10 – 16 000 μM), high sensitivity (158 μM/mM.cm-2) and selectivity
compared to the reported literature.
Additional information
Thesis (MEng (Chemical Engineering))--Cape Peninsula University of Technology, 2021
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