Volume 9, Issue 4 2401411
Research Article

Photoswitchable Gold Nanoparticles for Super-Resolution Radial Fluctuation Imaging in Nanostructured Materials

Julie Probst

Julie Probst

Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, Zürich, 8093 Switzerland

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Prerit Mathur

Prerit Mathur

Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, Zürich, 8093 Switzerland

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Meiyu Gai

Meiyu Gai

Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany

School of Engineering and Materials Science, Queen Mary University of London, Mile End, Eng, 215, London, E1 4NS UK

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Tieyan Si

Tieyan Si

Physics Department, School of Physics, Harbin Institute of Technology, Yikuang Street 2 2H, Harbin, 150080 P. R. China

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Qiang He

Qiang He

Key Lab of Microsystems and Microstructures Manufacturing, Harbin Institute of Technology, Yikuang Street 2 B1, Harbin, 150080 P. R. China

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Changyong Gao

Changyong Gao

Key Lab of Microsystems and Microstructures Manufacturing, Harbin Institute of Technology, Yikuang Street 2 B1, Harbin, 150080 P. R. China

Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201 P. R. China

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Hanchao Gao

Hanchao Gao

Institute of Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, Zürich, 8093 Switzerland

Advanced Analytical Technologies Laboratory, EMPA, Überlandstrasse 129, Dübendorf, 8600 Switzerland

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Andrei V Sapelkin

Andrei V Sapelkin

School of Engineering and Materials Science, Queen Mary University of London, Mile End, Eng, 215, London, E1 4NS UK

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Michael Kappl

Michael Kappl

Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany

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Guangyu Qiu

Guangyu Qiu

Institute of Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, Zürich, 8093 Switzerland

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Jing Wang

Jing Wang

Institute of Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, Zürich, 8093 Switzerland

Advanced Analytical Technologies Laboratory, EMPA, Überlandstrasse 129, Dübendorf, 8600 Switzerland

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Johannes Frueh

Corresponding Author

Johannes Frueh

Key Lab of Microsystems and Microstructures Manufacturing, Harbin Institute of Technology, Yikuang Street 2 B1, Harbin, 150080 P. R. China

Institute of Environmental Engineering, Department of Civil, Environmental and Geomatic Engineering, ETH Zürich, Zürich, 8093 Switzerland

E-mail: [email protected]; [email protected]

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Stavros Stavrakis

Corresponding Author

Stavros Stavrakis

Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zürich, Vladimir Prelog Weg 1, Zürich, 8093 Switzerland

E-mail: [email protected]; [email protected]

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First published: 29 December 2024

Abstract

Camera-based super-resolution approaches surpass the diffraction limit of conventional optical microscopy by relying on the stochastic activation and precise localization of fluorescent molecules. However, traditional probes such as organic dyes and quantum dots present challenges such as photobleaching and blinking variability, which limit their application in super-resolution imaging, particularly in non-liquid environments. Herein, the study demonstrates the potential of gold nanoparticles as a promising alternative for localization-based super-resolution imaging. The study specifically investigates how different surface functionalizations and states (aggregated vs isolated) of gold nanoparticles impact their photoluminescence properties, including fluorescence intensity, lifetime, and blinking behavior. By leveraging the intrinsic photoluminescence of gold nanoparticles, their capability is demonstrated as probes to achieve super-resolution imaging of nano-sized structures, at a resolution down to 100 nm, without the need for conventional imaging buffers. These proof-of-concept applications, which include imaging of silica nanosized wrinkles and logos, reveal that gold nanoparticles exhibit superior photophysical properties compared to common organic fluorophores, offering a promising alternative for super-resolution imaging. This work paves the way for the application of super-resolution fluorescence microscopy in materials science where non-liquid environments often restrict the use of traditional probes.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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