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Shape Measurement of Single Gold Nanorods in Water Using Open-Access Optical Microcavities.

Yumeng Yin¹, Aurélien A P Trichet¹, Jiangrui Qian¹

¹Department of Materials, University of Oxford, 16 Parks Road, Oxford OX1 3PH, United Kingdom.

The Journal of Physical Chemistry Letters

|November 27, 2024

Summary

This study introduces a new method for measuring the shape of tiny rod-shaped particles in liquids. The technique achieves 1% resolution, enabling precise nanoparticle characterization and water quality monitoring.

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Area of Science:

Nanotechnology and Materials Science
Biophysics
Environmental Science

Background:

Accurate shape measurement of single nanoparticles in fluid is crucial for various applications.
Current methods face challenges in real-time, in-situ analysis of particle morphology.

Purpose of the Study:

To develop a novel technique for precise aspect ratio measurement of rod-shaped particles.
To enable in situ and single-particle shape analysis for enhanced characterization and monitoring.

Main Methods:

Utilizing an optical microcavity to confine diffusing rod-shaped particles.
Analyzing alterations in the polarization state of a transmitted laser beam.
Correlating polarization changes with particle aspect ratio.

Main Results:

Achieved a resolution of approximately 1% in aspect ratio measurement.
Demonstrated the capability for in situ, real-time shape analysis of individual particles.
Validated the technique's potential for characterizing synthetic nanoparticles and detecting pathogens.

Conclusions:

The developed technique offers a new possibility for high-resolution, in situ single-particle shape measurement.
This method has significant implications for nanoparticle characterization, environmental water monitoring, and early pathogen detection.