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Synthesis of nanosized sulfate-modified α-Fe2O3 and its use for the fabrication of all-solid-state carbon paste pH sensor

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Abstract

A new solid-state pH sensor based on a carbon paste electrode, incorporated with sulfate-modified nanosized α-Fe2O3, was introduced. The nanosized α-Fe2O3 particles were synthesized via sol-gel technique and then modified with sulfate groups. The synthesized nanoparticles were characterized by scanning electron microscopy, Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD) methods. The obtained material was incorporated with carbon paste electrode to fabricate a solid-state pH sensor. It was shown that the modification of hematite nanoparticles with sulfate improved the sensor efficiency regarding Nernstian slope as well as pH determination range. The effect of electrode composition (sulfated α-Fe2O3, carbon, and binder) on its response was also investigated. The electrode gave response time of approximately 10 s, and no hysteric effect was found for sensor response. The electrode was checked for acid-base titrations, and the obtained results were comparable with those of traditional glass electrode. The developed sensor showed linear response from pH 1.5 to 12.5 with a slope of −58.5 ± 0.6 mV/pH (at 25 °C).

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Authors and Affiliations

  1. Department of Analytical Chemistry, University College of Science, University of Tehran, P.O. Box 14155-6455, Tehran, Iran

    Taher Alizadeh

  2. Department of Applied Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Ardabili, Iran

    Fariba Jamshidi

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  1. Taher Alizadeh
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  2. Fariba Jamshidi
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Correspondence to Taher Alizadeh.

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Alizadeh, T., Jamshidi, F. Synthesis of nanosized sulfate-modified α-Fe2O3 and its use for the fabrication of all-solid-state carbon paste pH sensor. J Solid State Electrochem 19, 1053–1062 (2015). https://doi.org/10.1007/s10008-014-2716-4

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  • DOI: https://doi.org/10.1007/s10008-014-2716-4

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