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Synthesis and Characterization of Alloy Au-Pt Nanoparticles Modified ITO Electrode by Electrodeposition Method

Bagheri Hariri, Mohieddin | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44635 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Dolati, Abolghasem
  7. Abstract:
  8. In this study, after electrodeposition of bimetallic Au-Pt nanoparticles on indium tin oxides (ITO) substrates the optical and electrochemical characteristics of obtained electrodes have been investigated. Moreover, the sensory properties of aquired electrodes toward Hg(II) and Cr(VI) detection has been also studied. The effect of various electrodeposition conditions on obtained nanoparticles have been studied through scanning electron microscopy (SEM) studies. The surface topography, surface roughness and particle size distribution of resulted Au-Pt nanoparticles after electrodeposition were also investigated by scanning Probe Microscopy in its NC-AFM mode. However, the nucleation of Au nanoparticle was adequately occurs through a progressive mechanism; by increasing the reduction overpotential of Pt nanoparticle there was a transition in nucleation mechanism from progressive to instantaneous mode for Pt clusters. Additionally, by increasing the concentration of Au complexes in electrolyte, the inclination to progressive nucleation of bimetallic Au-Pt nanoparticle has been increased. Ultraviolet-visible spectroscopy was used to investigate the influence of electrolyte PtCl6 2-/AuCl4- ratio on absorption or reflectance spectrums of attained ITO modified Au-Pt nanoparticles. Moreover, the crystal structure and crystalline phases of Au-Pt nanostructures were characterized using X-ray diffraction (XRD) patterns. The sensory response of Au-Pt nanoparticles modified ITO toward Hg(II) and Cr(VI) ions has been also investigated. The voltametric sensitivity toward Cr(VI) and the amperometric sensitivity toward Hg(II) for obtained electrode was found about 0.2 µA/µM and 1.4 µA/nM, respectively. A considerable detection limit of about 0.61 nM Hg(II) and 1.7 µM Cr(VI) for Au-Pt nanoparticles modified ITO electrodes was obtained which was competitive with those electrodes have been reported in literatures
  9. Keywords:
  10. Mechanism ; Alloy Gold-Platinum Nanoparticles ; Indium Tin Oxide (ITO)Nanostructure ; Electrodeposition ; Sensory Properties

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