Highly heterogeneous morphology of cobalt oxide nanostructures for the development of sensitive and selective ascorbic acid non-enzymatic sensor - Université de Lorraine Access content directly
Journal Articles Biosensors Year : 2023

Highly heterogeneous morphology of cobalt oxide nanostructures for the development of sensitive and selective ascorbic acid non-enzymatic sensor

Aneela Tahira
  • Function : Author
Fouzia Chang
  • Function : Author
Abdul Ghaffar Solangi
  • Function : Author
Muhammad Ali Bhatti
  • Function : Author
Brigitte Vigolo
Ayman Nafady
Zafar Hussain Ibupoto

Abstract

The surface tailored metal oxide nanostructures for the development of non-enzymatic sensors are highly demanded but it's a big task due to wide range of complexities during the growth process. The presented study was focused on the surface modification of heterogeneous morphology of cobalt oxide (Co 3 O 4) prepared by hydrothermal method. Further surface modification was done with the use of sodium citrate as a reducing and surface modifying agent for the Co 3 O 4 nanostructures through high density of oxygenated terminal groups from citrate ions. The citrate ions enabled a significant surface modification of Co 3 O 4 nanostructures which further improved the electrochemical properties of Co 3 O 4 material towards the design of nonenzymatic ascorbic acid sensor in phosphate buffer solution of pH 7.4. The morphology and crystal arrays of Co 3 O 4 nanostructures were studied by scanning electron microscopy (SEM) and powder X-ray diffraction (XRD) techniques. Theses physical characterizations have shown highly tailored surface features of Co 3 O 4 nanostructures and significant impact on the crystal properties .. The electrochemical activity of Co 3 O 4 was studied by chronoamperometry, linear sweep voltammetry, and cyclic voltammetry (CV) for the detection of ascorbic acid. The linear range of proposed sensor was measured from 0.5 mM to 6.5 mM and a low limit of detection of 0.001mM was also estimated. The presented Co 3 O 4 nanostructures exhibited significant surface roughness and surface area, consequently played a vital role towards selective, sensitive and stable detection of ascorbic acid. The use of low cost surface modifying agent like sodium citrate could be of great interest for surface roughness and high surface area of nanostructured materials for the improved electrochemical properties for the biomedical, energy storage and conversion systems.
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Dates and versions

hal-04197512 , version 1 (06-09-2023)

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Abdul Sattar Chang, Aneela Tahira, Fouzia Chang, Abdul Ghaffar Solangi, Muhammad Ali Bhatti, et al.. Highly heterogeneous morphology of cobalt oxide nanostructures for the development of sensitive and selective ascorbic acid non-enzymatic sensor. Biosensors, 2023, 13 (1), pp.147. ⟨10.3390/bios13010147⟩. ⟨hal-04197512⟩
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