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Related Concept Videos

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Related Experiment Video

Updated: Jul 2, 2026

Reverse Microemulsion-mediated Synthesis of Monometallic and Bimetallic Early Transition Metal Carbide and Nitride Nanoparticles
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Formation of Bimetallic Nanoparticles via Exsolution Using a Reducible Metal Oxide Capping Layer.

Juanita Hidalgo1, Gustavo Zottis Girotto2, Matthäus Siebenhofer3,4

  • 1Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

ACS Nano
|July 1, 2026
PubMed
Summary

Researchers developed a new method using a reducible tin dioxide (SnO2) capping layer to create bimetallic nanoparticles. This strategy expands the range of elements for advanced catalysts, forming smaller, more stable nickel-tin nanoparticles.

Keywords:
bimetallic nanoparticlesexsolutionin situ measurementsperovskite oxidessurface chemistrysurface morphology

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Catalysis

Background:

  • Bimetallic nanoparticles are crucial for enhancing heterogeneous catalysis and solid-state electrochemistry.
  • Exsolution is a method for nanoparticle formation, but it's limited by elements within the host oxide lattice.

Purpose of the Study:

  • To develop a novel strategy for forming bimetallic nanoparticles using a reducible capping layer.
  • To expand the range of elements available for bimetallic nanoparticle synthesis via exsolution.

Main Methods:

  • Utilized a reducible tin dioxide (SnO2) capping layer on La0.5Sr0.5Ti0.94Ni0.06O3 (LSTN) host.
  • Employed in situ near-ambient pressure X-ray photoelectron spectroscopy to monitor surface chemistry.
  • Applied grazing incidence small-angle X-ray scattering (GISAXS), Auger spectroscopy, and scanning transmission electron microscopy for characterization.

Main Results:

  • Successfully formed bimetallic nickel-tin (Ni0-Sn0) nanoparticles via exsolution.
  • Observed SnO2 volatilization, exposing the LSTN surface to reducing conditions for Ni exsolution.
  • Confirmed smaller size and enhanced thermal stability of bimetallic nanoparticles compared to monometallic Ni.
  • GISAXS and simulations validated SnO2 loss and bimetallic particle formation.

Conclusions:

  • The SnO2 capping layer strategy effectively enables the formation of bimetallic nanoparticles.
  • This approach broadens the compositional possibilities for advanced catalytic materials.
  • The method is applicable to other reducible metal oxides and perovskite hosts.