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Metallic Solids

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....

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Updated: Aug 6, 2025

Large Area Substrate-Based Nanofabrication of Controllable and Customizable Gold Nanoparticles Via Capped Dewetting

Large Area Substrate-Based Nanofabrication of Controllable and Customizable Gold Nanoparticles Via Capped Dewetting

Published on: February 26, 2019

Structural Size Effect in Capped Metallic Nanoparticles.

Cora Moreira Da Silva¹, Armelle Girard^1,2, Yann Le Bouar¹

¹Université Paris-Saclay, ONERA, CNRS, Laboratoire d'Étude des Microstructures, Châtillon 92322, France.

|March 14, 2023

Summary

This summary is machine-generated.

Surfactants significantly alter metallic nanoparticle structure, expanding lattice parameters by up to 2%. This size-dependent effect, linked to surface stress and charge transfer, offers new insights into nanoparticle synthesis.

Keywords:

colloidal synthesis lattice parameters nanoparticle surface stress surfactants transmission electron microscopy

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Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

Area of Science:

Materials Science
Nanotechnology
Surface Chemistry

Background:

Surfactants are crucial in colloidal synthesis for controlling nanoparticle size and shape.
The impact of surfactants on the internal structure of metallic nanoparticles remains poorly understood.

Purpose of the Study:

To investigate how surfactants influence the lattice parameter of metallic nanoparticles.
To elucidate the mechanisms behind surfactant-induced structural modifications in nanoparticles.

Main Methods:

Electron diffraction measurements
High-resolution transmission electron microscopy (HRTEM)
X-ray photoelectron spectroscopy (XPS)
Energy-dispersive X-ray spectroscopy (EDX)

Main Results:

A 2% lattice parameter expansion was observed in 4 nm NiPt nanoparticles coated with oleylamine and oleic acid.
This expansion could not be attributed to crystal defects, twinning, oxidation, or atom insertion.
Lattice parameter variation showed a linear dependence on the inverse of nanoparticle size, indicating surface stress.
Lattice parameter changes were observed for pure Ni and Pt nanoparticles with various surfactants, potentially related to charge transfer.

Conclusions:

Surfactants significantly modify the crystalline structure of metallic nanoparticles, specifically their lattice parameters.
Surface stress and charge transfer between surfactant molecules and nanoparticle surfaces are key factors influencing these structural changes.