Two Electron Transfer Mediated Enhanced Electrochemical Nitrate Detection by Sn Doped CuxO Thin Film Electrode

27 Pages Posted: 7 Mar 2023

See all articles by Ariel Ndala

Ariel Ndala

Cape Peninsula University of Technology

Gloria Kibambo

Cape Peninsula University of Technology

Orlette Mkhari

Cape Peninsula University of Technology

Mahabubur R. Chowdhury

Cape Peninsula University of Technology

Abstract

The unique electrochemical and electronic properties of CuxO (Cu2O/CuO) gives it merit to be used in the development of electronic devices. This paper presents the facile chemical route for the development of a sensitive, accurate, and low-cost nitrate electrochemical sensor based on undoped and Sn-doped CuxO thin film electrode. Various characterization techniques were used to study the physical, electro-chemical, and electronic properties of the material. Sn-doping resulted in an increase in the number of electron transfers from 1 to 2 as compared to undoped CuxO. The prepared sensor exhibited a high sensitivity of 100.27 µA mM-1cm-2, a wide linear concentration range of up to 50 mM, a fast response time of < 5 s was observed at a potential of -1 V (vs. Ag / AgCl), and a very low limit of detection of 0.04 µM (S/N = 3) that outperformed those in the recent literature. The electrode was selective for nitrate in the presence of common interference species and exhibited chemical stability and reproducibility.

Keywords: spin-coating, metal-organic decomposition, Sn-doping, Thin films, electrochemical sensor

Suggested Citation

Ndala, Ariel and Kibambo, Gloria and Mkhari, Orlette and Chowdhury, Mahabubur R., Two Electron Transfer Mediated Enhanced Electrochemical Nitrate Detection by Sn Doped CuxO Thin Film Electrode. Available at SSRN: https://ssrn.com/abstract=4369507 or http://dx.doi.org/10.2139/ssrn.4369507

Ariel Ndala

Cape Peninsula University of Technology ( email )

Symphony Way
Brllville
Cape Town, 7535
South Africa

Gloria Kibambo

Cape Peninsula University of Technology ( email )

Symphony Way
Brllville
Cape Town, 7535
South Africa

Orlette Mkhari

Cape Peninsula University of Technology ( email )

Symphony Way
Brllville
Cape Town, 7535
South Africa

Mahabubur R. Chowdhury (Contact Author)

Cape Peninsula University of Technology ( email )

Symphony Way
Brllville
Cape Town, 7535
South Africa

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