3 years ago

Non-Enzymatic Fructose Sensor Based on Co3O4 Thin Film

Non-Enzymatic Fructose Sensor Based on Co3O4 Thin Film
Tunde Ojumu, Tatenda Gota, Mahabubur Chowdhury
In this study, we report on the selective of fructose on Co3O4 thin film electrode surface. A facile chemical solution deposition technique was used to fabricate Co3O4 thin film on fluorine doped tin oxide, FTO, glass. Electrode characterization was done using XRD, HRTEM, SEM, AFM, and EIS. The constructed sensor exhibited two distinctive linear ranges (0.021–1.74 mM; 1.74–∼15 mM) covering a wide linear range of up to ∼15 mM at an applied potential of +0.6 V vs Ag/AgCl in 0.1 M NaOH solution. The sensor demonstrated high, reproducible and repeatable (R.S.D of <5 %) sensitivity of 495 (lower concentration range) & 53 (higher concentration range) μA cm−2 mM−1. The sensor produced a low detection limit of ∼1.7 μM (S/N=3). The electrode was characterised by a fast response time of <6 s and long term stability. The repeatability and stability of the electrode resulted from the chemical stability of Co3O4 thin film. The sensor was highly selective towards fructose compared to the presence of other key interferences i. e. AA, AC, UA. The ease of the electrode fabrication coupled with good electrochemical activity makes Co3O4 thin film, a promising candidate for non-enzymatic fructose detection.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/elan.201700503

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