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Photoswitchable Gold Nanoparticles for Super-Resolution Radial Fluctuation Imaging in Nanostructured Materials
Julie Probst1, Prerit Mathur1, Meiyu Gai2,3
1Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, Zürich, 8093, Switzerland.
Small Methods
|April 24, 2025
Summary
Gold nanoparticles offer a novel solution for super-resolution microscopy, overcoming limitations of traditional probes. Their unique photoluminescence enables high-resolution imaging in challenging non-liquid environments.
Area of Science:
- Nanotechnology
- Optical Microscopy
- Materials Science
Background:
- Super-resolution microscopy achieves resolutions beyond the diffraction limit using stochastic molecular activation and localization.
- Conventional probes like organic dyes and quantum dots suffer from photobleaching and blinking, limiting their use in non-liquid environments.
Purpose of the Study:
- To investigate gold nanoparticles (AuNPs) as alternative probes for localization-based super-resolution imaging.
- To evaluate the impact of AuNP surface functionalization and aggregation state on their photoluminescence properties.
Main Methods:
- Characterization of AuNP photoluminescence, including intensity, lifetime, and blinking behavior.
- Demonstration of super-resolution imaging of nano-sized structures using AuNPs without conventional imaging buffers.
Main Results:
- Gold nanoparticles exhibit intrinsic photoluminescence suitable for super-resolution imaging.
- AuNPs achieved imaging resolutions down to 100 nm in non-liquid environments.
- AuNPs demonstrated superior photophysical properties compared to common organic fluorophores.
Conclusions:
- Gold nanoparticles are a promising alternative to traditional probes for super-resolution imaging, especially in non-liquid settings.
- This research expands the applicability of super-resolution fluorescence microscopy to materials science applications previously restricted by probe limitations.
