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Updated: Apr 11, 2026

A Continuous-flow Photocatalytic Reactor for the Precisely Controlled Deposition of Metallic Nanoparticles

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Published on: April 10, 2019

Pt Diffusion Dynamics for the Formation Cr-Pt Core-Shell Nanoparticles.

G Gupta, P Iqbal, F Yin¹

¹§School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China.

Langmuir : the ACS Journal of Surfaces and Colloids

|June 4, 2015

Summary

This summary is machine-generated.

Researchers created novel core-shell chromium-platinum (Cr-Pt) nanoparticles. Platinum diffusion formed an alloyed core-shell structure, suggesting an electric-field-assisted process for advanced nanoparticle synthesis.

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Area of Science:

Materials Science
Nanotechnology
Surface Chemistry

Background:

Layered core-shell nanoparticles offer unique properties for catalysis and electronics.
Chromium (Cr) and Platinum (Pt) are key elements in various advanced material applications.
Controlling nanoparticle morphology and composition is crucial for tailored functionalities.

Purpose of the Study:

To synthesize and characterize layered core-shell bimetallic Cr-Pt nanoparticles.
To investigate the mechanism of Pt diffusion and alloy formation within the core-shell structure.
To understand the role of Cr nanoparticle properties in facilitating Pt diffusion.

Main Methods:

Preparation of Cr nanoparticles followed by deposition of a Pt-ion-containing supramolecular complex.
Reduction of the intermediate complex to form bimetallic nanoparticles.
Characterization using X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and aberration-corrected scanning transmission electron microscopy (AC-STEM).

Main Results:

Successful synthesis of layered core-shell Cr-Pt nanoparticles.
Evidence of Pt diffusion, leading to a Pt/Cr-alloyed core and shell structure.
Characterization confirmed the nanoparticle morphology and composition.

Conclusions:

Pt diffusion during or after nanoparticle formation results in an alloyed core-shell structure.
The diffusion process is likely electric-field-assisted, consistent with Cabrera-Mott theory.
The low work function of oxygen-defective Cr nanoparticles and high electron affinity of Pt drive this diffusion process, enabling controlled alloy formation.