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Morphology Engineering in Multicomponent Hollow Metal Chalcogenide Nanoparticles.

Bo Shen, Liliang Huang, Jiahong Shen

¹Department of Materials Science and Engineering, University of California, Berkeley, Berkeley, California 94720, United States.

|February 17, 2023

Summary

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Researchers created diverse hollow metal sulfide nanoparticles using advanced lithography and a sulfidation process. Different metal diffusion rates and miscibility dictate the final particle structures, enabling tailored nanomaterials for energy and environmental applications.

Area of Science:

Materials Science
Nanotechnology
Chemistry

Background:

Hollow metal chalcogenide nanoparticles are crucial for environmental and energy applications.
Controlling nanoparticle morphology is key to optimizing their performance.

Purpose of the Study:

To synthesize diverse hollow metal sulfide nanoparticles.
To investigate how diffusion kinetics, composition, and phase boundaries influence nanoparticle morphology.
To understand the formation mechanisms of various hollow sulfide structures.

Main Methods:

Utilized scanning probe block copolymer lithography for precise nanoparticle fabrication.
Employed a Kirkendall effect-based sulfidation process for hollow structure formation.
Analyzed the impact of temperature, elemental composition, and miscibility on morphology.

Keywords:

Heterostructures Hollow nanoparticles Kirkendall effect Metal chalcogenide Nanolithography

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Main Results:

CoNi alloys formed single-shell sulfides due to similar diffusion rates.
CuNi alloys yielded diverse morphologies (yolk-shell, double-shell, single-shell) owing to different diffusion rates.
Co-Cu heterodimers formed hollow heterostructures with tunable void characteristics, influenced by temperature and phase boundaries.

Conclusions:

The study demonstrates a versatile method for creating diverse hollow metal sulfide nanoparticles.
Diffusion rates and miscibility are critical factors controlling nanoparticle morphology.
Density functional theory calculations support the observed morphological transitions at higher temperatures.