Watching single nanoparticles grow in real time through supercontinuum spectroscopy

Area of Science:

• Nanotechnology
• Materials Science
• Physical Chemistry

Background:

• Monitoring the dynamic processes of nano-object growth and assembly is crucial for understanding nanomaterial properties.
• Existing techniques often lack the necessary time resolution or in situ capabilities to capture these rapid events accurately.

Purpose of the Study:

• To introduce and validate a novel dark-field scattering technique for real-time monitoring of single nano-object dynamics.
• To quantitatively investigate the growth kinetics of individual gold nanorods using this advanced technique.

Main Methods:

• Development of a fast dark-field scattering spectroscopy system with millisecond time resolution.
• In situ monitoring of single gold nanorod growth.
• Complementary analysis using scanning electron microscopy (SEM) and finite-difference time-domain (FDTD) simulations.

Main Results:

• The technique successfully captured full broadband spectra of single nano-objects with millisecond resolution.
• Precise quantitative data on the growth kinetics of individual gold nanorods were obtained.
• Corroboration of experimental findings with SEM and FDTD simulations.

Conclusions:

• The developed dark-field scattering technique is a powerful tool for in situ, real-time studies of nano-object assembly and growth.
• This method provides unprecedented quantitative insights into nanomaterial growth dynamics, particularly for gold nanorods.