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High Resolution Physical Characterization of Single Metallic Nanoparticles

High Resolution Physical Characterization of Single Metallic Nanoparticles

Published on: June 28, 2019

Metallic versus covalent bonding: Ga nanoparticles as a case study.

Paolo Ghigna¹, Giorgio Spinolo, Giovanni Battista Parravicini

¹INSTM, IENI/CNR, Dipartimento di Chimica fisica M. Rolla, Università di Pavia, I27100 Pavia, Italy. paolo.ghigna@unipv.it

Journal of the American Chemical Society

|June 6, 2007

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Gallium nanostructures exhibit unique solid phases and liquid behavior influenced by temperature and particle size. Surface tension stabilizes solid gallium phases and a liquid-like phase with dimeric molecules, even at low temperatures.

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Gallium nanostructures display complex polymorphism and liquid phase behavior.
Surface tension and hydrostatic pressure influence the stability of solid gallium phases.
Understanding nanoscale effects is crucial for materials science.

Purpose of the Study:

To investigate the local coordination in gallium nanostructures using X-ray absorption spectroscopy.
To determine the effect of temperature and particle size on gallium nanostructures.
To explore the role of surface free energy in stabilizing gallium phases.

Main Methods:

Systematic X-ray absorption spectroscopy.
Variable temperature and particle size studies.

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Comparison with molecular dynamic calculations.

Main Results:

Nanostructure significantly impacts gallium polymorphism and liquid phase stability.
Surface tension stabilizes solid phases and a liquid-like phase with dimeric molecules down to 90 K.
Lower Ga-Ga distance observed in liquid phase dimers compared to alpha solid gallium.

Conclusions:

Surface free energy favors metallic arrangements and stabilizes dimeric liquid-like phases in gallium nanostructures.
Dimeric Ga2 units in liquid nanostructured gallium exhibit covalent character.
Experimental findings align with molecular dynamic simulations, confirming nanoscale effects on gallium's phase behavior.