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Updated: Jun 16, 2025

Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications

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Published on: March 22, 2020

Excited-State Pathways in Near-Infrared Emitting DNA-Stabilized Silver Nanoclusters with Different Geometries.

Siyu Liu¹, Cecilia Cerretani¹, Jakub Dostál²

¹Nano-Science Center and Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark.

|June 14, 2025

Summary

DNA-stabilized silver nanoclusters (DNA-AgNCs) show tunable luminescence based on DNA sequence and shape. Ultrafast spectroscopy reveals distinct excited-state relaxation pathways for rod-like versus spherical DNA-AgNCs, aiding imaging applications.

Keywords:

Bioimaging fluorophores DNA-stabilized silver nanoclusters Excited state dynamics Near-infrared emitter Structure−photophysical correlation

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Area of Science:

Nanotechnology
Biochemistry
Spectroscopy

Background:

DNA-stabilized silver nanoclusters (DNA-AgNCs) are biocompatible fluorophores with tunable properties.
Their structure-photophysical relationships are poorly understood due to limited crystal structures.

Purpose of the Study:

To investigate the excited-state relaxation dynamics of DNA-AgNCs with different geometries.
To correlate structural features (rod-like vs. spherical) with luminescence behavior.

Main Methods:

Ultrafast transient absorption spectroscopy was used to study three distinct DNA-AgNCs.
Analysis focused on excited-state relaxation pathways and timescales.

Main Results:

Rod-like DNA-AgNCs exhibited sequential formation of nanosecond and microsecond luminescent states.
Spherical DNA-AgNCs showed direct formation of a microsecond luminescent state from the Franck-Condon state on a subpicosecond timescale.

Conclusions:

The study elucidates the impact of DNA-AgNC geometry on excited-state dynamics.
These findings advance the photophysical understanding and structural engineering of DNA-AgNCs for advanced imaging.