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A Highly Sensitive and Selective Non‐enzymatic Hydrogen Peroxide Sensor Based on Nanostructured Co 3 O 4 Thin Films Using the Sol‐gel Method
Author(s) -
Khadhraoui Hanen,
Othmani Abdelhak,
Kouki Abdessalem,
Zouaoui Mouldi
Publication year - 2021
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.202060052
Subject(s) - thin film , absorbance , hydrogen peroxide , materials science , scanning electron microscope , detection limit , transmission electron microscopy , cyclic voltammetry , amperometry , analytical chemistry (journal) , sol gel , nuclear chemistry , nanotechnology , chemistry , electrochemistry , chromatography , electrode , organic chemistry , composite material
In this work we report an easy and efficient way to fabricate nanostructured cobalt oxide (Co 3 O 4 ) thin films as a non‐enzymatic sensor for H 2 O 2 detection. Co 3 O 4 thin films were grown on ITO glass substrates via the sol‐gel method and characterized with several techniques including X‐ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and optical absorbance. The Co 3 O 4 thin films’ performance regarding hydrogen peroxide detection was studied in a 0.1 M NaOH solution using two techniques, cyclic voltammetry (CV) and amperometry. The films exhibited a high sensitivity of 1450 μA.mM −1 .cm −2 , a wide linear range from 0.05 μM to 1.1 mM, and a very low detection limit of 18 nM. Likewise, the Co 3 O 4 thin films produced showed an exceptional stability and a high selectivity.