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Surface Alloying in Silver-Cobalt through a Second Wave Solution Combustion Synthesis Technique.

Anchu Ashok1, Anand Kumar2, Faris Tarlochan3

  • 1Department of Mechanical and Industrial Engineering, College of Engineering, Qatar University, Doha P.O. Box-2713, Qatar. anchuashok@qu.edu.qa.

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|August 12, 2018
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Summary

This study synthesized silver-cobalt nanopowders using solution combustion synthesis. The second wave combustion synthesis mode (SWCS) improved control over mixing and alloying, leading to enhanced electronic interactions between silver and cobalt.

Keywords:
Ag-Co nanoparticlesbimetalssecond wave combustion synthesissolution combustion synthesis

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Nanopowders are crucial for advanced materials.
  • Controlling nanoparticle morphology and composition is key for tailored properties.
  • Solution combustion synthesis offers a versatile route for nanomaterial production.

Purpose of the Study:

  • To synthesize silver-cobalt nanopowders using three distinct solution combustion synthesis modes.
  • To investigate the impact of synthesis conditions on nanoparticle morphology and structure.
  • To elucidate the electronic interactions between silver and cobalt in the synthesized nanopowders.

Main Methods:

  • Solution combustion synthesis (SCS) with three different modes.
  • Characterization using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), UV-Visible Spectroscopy (UV-vis), Transmission Electron Microscopy (TEM), and X-Ray Photoelectron Spectroscopy (XPS).

Main Results:

  • The second wave combustion synthesis (SWCS) mode demonstrated superior control over nanopowder mixing and alloying.
  • XRD and XPS analyses revealed peak shifts indicating changes in cell parameters and strong electronic interactions between Ag and Co.
  • SWCS resulted in reduced carbon content compared to single-stage combustion, followed by atomic rearrangement.

Conclusions:

  • The sequence of combustion significantly influences the structure and composition of silver-cobalt nanopowders.
  • SWCS is an effective method for achieving controlled alloying and strong electronic interactions in Ag-Co systems.
  • The findings provide insights into tailoring nanomaterial properties through controlled synthesis parameters.