Facile and ultra-sensitive voltammetric electrodetection of Hg2+in aqueous media using electrodeposited AuPtNPs/ITO

Bagheri Hariri, M ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1039/d1ay00361e
  3. Publisher: Royal Society of Chemistry , 2021
  4. Abstract:
  5. In this study, we have investigated the use of electrodeposited Au-Pt nanoparticles (AuPtNPs) on indium tin oxide (ITO) for the detection of Hg2+ heavy ions in water samples. The mechanism of AuPtNP electrocrystallization on ITO glass in an aqueous solution containing 0.5 mM HAuCl4 + 0.5 mM H2PtCl6 is described for the first time. The nucleation mechanism of monometallic AuNPs on ITO was found to be progressive; however, a transition from progressive to instantaneous was observed for bimetallic AuPtNPs at elevated overpotentials. The modified ITOs were then assessed for the electrodetection of Hg2+ in aqueous media. It was shown by differential pulse voltammetry (DPV) that the sensitivity of the constructed AuPtNPs/ITO electrode toward Hg2+ was about 2.08 μA nM-1. An approximate detection limit of 4.03 nM Hg2+ was achieved, which is below the permissible level of 30.00 nM Hg2+ in drinking water, according to the World Health Organization (WHO). Characterization of AuPt nanostructures was carried out by X-ray diffraction (XRD) patterns, scanning electron microscopy (SEM), and different electrochemical techniques (cyclic voltammetry (CV), chronoamperometry, and electrochemical impedance spectroscopy (EIS)). Our results indicate a good potential of a facile and robust electrochemical assembly for on-site detection of heavy metals in water samples. © The Royal Society of Chemistry
  6. Keywords:
  7. Binary alloys ; Chlorine compounds ; Chronoamperometry ; Cyclic voltammetry ; Electrochemical impedance spectroscopy ; Electrodeposition ; Electrodes ; Heavy ions ; Heavy metals ; ITO glass ; Potable water ; Scanning electron microscopy ; Tin oxides ; Differential pulse voltammetry ; Electrochemical assembly ; Electrochemical techniques ; Electrocrystallization ; Nucleation mechanism ; On-site detection ; Pt nanoparticles ; World Health Organization ; Tungsten metallography ; Gold ; Indium tin oxide ; Mercury ; Metal nanoparticle ; Tin derivative ; Water ; Gold ; Mercury ; Metal Nanoparticles ; Tin Compounds ; Water
  8. Source: Analytical Methods ; Volume 13, Issue 24 , 2021 , Pages 2688-2700 ; 17599660 (ISSN)
  9. URL: https://pubs.rsc.org/en/content/articlelanding/2021/AY/D1AY00361E