Electrochemical sensor for detection of mercury (II) ions in water using nanostructured bismuth hexagons

Abstract

This study presents a systematic observation of the ability of bismuth nanostructures to detect trace amounts of mercury. Nanostructured hexagons of bismuth were synthesized using electrochemical deposition with potentiostatic mode on indium tin oxide-coated glass electrodes. Regular hexagons composed of nano-sized hexagonal building blocks (edge length \(\approx 80\) to 700 nm) with well-defined edges were observed in scanning electron microscopy studies. X-ray diffraction pattern indicates the presence of polycrystalline bismuth and bismuth oxide in rhombohedral and cubic phases, respectively. X-ray photoelectron spectroscopy was done to analyze the chemical structure of the prepared nanostructures. Square wave anodic stripping voltammetry technique confirms that these nanostructured electrodes are highly sensitive to \(Hg^{2+}\) ions down to concentrations as low as 0.74 ppb.

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Acknowledgements

We thank DST, New Delhi (IFA-11/PH-06, IFA-13/PH-84), SERB, New Delhi (ECR/2016/1780, ECR/2016/1888), and UGC DAE CSR, Indore (CSR-IC/CRS-73/2014-15/581), for providing financial support. We are also thankful to MRC, MNIT Jaipur, for providing characterization facilities.

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Correspondence to Sandeep Gupta or Manoj Kumar.

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Gupta, S., Singh, R., Anoop, M.D. et al. Electrochemical sensor for detection of mercury (II) ions in water using nanostructured bismuth hexagons. Appl. Phys. A 124, 737 (2018). https://doi.org/10.1007/s00339-018-2161-9

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