DNA-Templated Silver Nanoclusters for Optical Applications

DNA-templated silver nanoclusters (AgNCs) are atomically precise assemblies of a few to a few dozen silver atoms stabilised within single-stranded DNA scaffolds. The nucleobase sequence dictates cluster size, charge state and geometric arrangement, enabling fine-tuning of absorption and emission across the visible and near-infrared (NIR) spectrum. These hybrid biomolecular-metal constructs exhibit high photoluminescence quantum yields, exceptional brightness relative to organic dyes, minimal blinking and low cytotoxicity. Advances in structural characterisation and excited-state spectroscopy have begun to unravel the interplay between electronic states and specific vibrational modes, informing rational design. Applications span ultrasensitive biosensing, super-resolution microscopy, nanothermometry and photonic circuitry. Key challenges include precise control of sequence–structure–property relationships, integration into functional devices and translation to in vivo imaging regimes within tissue transparency windows.

Research from Nature Portfolio

Recent studies have revealed the ultrafast excited-state dynamics governing emission in DNA-AgNCs. Multidimensional spectroscopy has demonstrated sub-100 fs coherence and energy transfer between electronic states coupled to defined vibrational modes, elucidating the cascade from initial excitation to the emissive state. In parallel, the introduction of time-gated Fourier transform spectroscopy to single-photon counting setups has provided a powerful route to disentangle overlapping fluorescence and phosphorescence signals without optical filters. This technique enables simultaneous spectral and temporal resolution of short- and long-lived luminescence bands, offering a versatile tool for characterising novel DNA-stabilised emitters and improving signal discrimination in complex environments.

DNA-Templated Silver Nanoclusters for Optical Applications publication trend

The graph below shows the total number of articles in dna-templated silver nanoclusters for optical applications across all publications each year (not limited to Nature Index journals).

Technical terms

DNA-templated silver nanocluster: A few-atom silver aggregate stabilised within a DNA oligonucleotide, whose sequence directs cluster composition and optical properties.

Photoluminescence quantum yield: The fraction of absorbed photons re-emitted as fluorescence, indicating emitter brightness.

Stokes shift: The wavelength difference between maximum absorption and emission, reflecting energy loss to vibrational relaxation.

Förster resonance energy transfer (FRET): A non-radiative energy transfer mechanism between a donor and acceptor chromophore, sensitive to their distance (1–10 nm range).

Time-gated Fourier transform spectroscopy: A method combining interferometry with temporal gating to separate and resolve overlapping luminescence signals by lifetime.

References

1. Ultrafast coherence transfer in DNA-templated silver nanoclusters. Nature Communications (2017).
2. Time gated Fourier transform spectroscopy as a technique for disentangling short- and long-lived luminescence. Communications Materials (2023).
3. A DNA‐Stabilized Ag1812+ Cluster with Excitation‐Intensity‐Dependent Dual Emission. Angewandte Chemie International Edition (2023).
4. Chemistry-Informed Machine Learning Enables Discovery of DNA-Stabilized Silver Nanoclusters with Near-Infrared Fluorescence. ACS Nano (2022).
5. DNA-Protected Silver Clusters for Nanophotonics. Nanomaterials (2015).