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Atomically Precise PbSe Nanocrystal Protected by Carboxylates.

Fuyan Ma¹, Chenjie Zeng¹

¹Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States.

Journal of the American Chemical Society

|November 11, 2025

Summary

Researchers achieved atomic precision in lead selenide (PbSe) nanocrystals (NCs) using carboxylate ligands. This breakthrough enables precise control over NC structure and properties for advanced nanotechnology applications.

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Area of Science:

Materials Science
Nanotechnology
Solid State Chemistry

Background:

Lead-based semiconductor nanocrystals (NCs) are crucial for energy and information technologies.
Achieving atomic-level control over NCs is a significant challenge in nanotechnology.

Purpose of the Study:

To demonstrate atomic precision in lead selenide (PbSe) nanocrystals.
To investigate the role of carboxylate ligands in stabilizing NC surfaces.
To establish a model system for precision engineering of Pb-based NCs.

Main Methods:

Synthesis of PbSe nanocrystals capped with specific carboxylate ligands.
Characterization of NC structure, including core shape and facet exposure.
Analysis of ligand binding modes and surface passivation.

Main Results:

Atomic precision achieved in a 1.8 nm PbSe NC (Pb₆₈Se₂₈O₈(O₂CR)₆₄) with defined optical properties.
Pb-rich (111) facets stabilized by a Pb-oxo motif and diverse carboxylate binding modes.
Self-assembly of ligand oxygens into ordered O(111) adlayers.

Conclusions:

Atomically precise PbSe NCs can be synthesized, offering a model system for materials design.
The Pb-oxo motif and specific ligand binding are key to stabilizing the NC surface.
This work paves the way for precision engineering of lead-based NCs for advanced applications.