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Hydrothermally synthesized polycrystalline Ce-TiO2@rGO compound for sensing of para-nitroaniline

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Abstract

Polycrystalline Ce-TiO2@rGO compound has been successfully synthesized by hydrothermal method. The synthesized compound was characterized by powder X-ray diffraction (XRD), Fourier transform-infrared spectrophotometer, field-emission scanning electron microscopy, transmission electron microscopy and thermogravimetric analysis to confirm its crystallinity, morphology and thermal stability. From XRD results, crystallite size of the Ce-TiO2@rGO compound was found between 9–15.2 nm, and SEM images confirm the needle-like structure of Ce-TiO2 particles distributed over the reduced graphene oxide (rGO) layer. Further, the electrochemical behaviour of the Ce-TiO2@rGO compound was examined by cyclic voltammetry and differential pulse voltammetry (DPV) techniques for the electrochemical detection of para-nitroaniline. The surface of the glassy carbon electrode was modified by the drop-casting technique. The scan rate effect showed that the electrode process is diffusion controlled. The modified glassy carbon electrode (MGCE) exhibited the 0.347 μM limit of detection, satisfactory sensitivity of 49.12 µA µM−1 m−2 and linear range between 0.1 and 1.5 µM. DPV interference studies results confirmed the selectivity of MGCE. The developed MGCE electrochemical sensor thus implemented is also advantageous for its good selectivity, stability, cost-effectiveness, portability and reproducibility.

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Acknowledgements

We are highly thankful to the School of Studies in Chemistry, Jiwaji University, Gwalior (M.P) for providing all the essential services. We also acknowledge Dr. A.P.J Abdul Kalam Central Instrumentation Facility (CIF), Jiwaji University, for characterization and funding support by Jiwaji University grant no. F/DEV/2019/588. We are also thankful to CSIR-IIITM, Jammu, for FE-SEM facilities.

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Authors and Affiliations

  1. School of Studies in Chemistry, Jiwaji University, Gwalior, 474011, India

    Neeraj Kumar, Arti Sharma & Radha Tomar

  2. School of Studies in Physics, Jiwaji University, Gwalior, 474011, India

    Dinesh Chandra Tiwari

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  1. Neeraj Kumar
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  2. Arti Sharma
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  3. Dinesh Chandra Tiwari
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Correspondence to Neeraj Kumar.

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Kumar, N., Sharma, A., Tiwari, D.C. et al. Hydrothermally synthesized polycrystalline Ce-TiO2@rGO compound for sensing of para-nitroaniline. Bull Mater Sci 45, 87 (2022). https://doi.org/10.1007/s12034-022-02673-w

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