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Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy

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Thermal blooming effect on particle sizing with photon correlation spectroscopy.

X M Lin¹, G Wang, C M Sorensen

¹Kansas State University, Manhattan, Kansas 66506, USA.

|February 29, 2008

Summary

Photon correlation spectroscopy (PCS) was used to analyze gold nanocrystal superlattices. Thermal blooming effects were identified and corrected, yielding accurate gold nanoparticle sizes.

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Area of Science:

Colloid and Surface Science
Nanotechnology
Laser Physics

Background:

Photon correlation spectroscopy (PCS) is a technique used to determine particle size distributions in colloidal suspensions.
Gold nanocrystal superlattices exhibit unique optical properties influenced by interparticle interactions and external stimuli.
Thermal blooming, a laser-induced optical distortion, can affect spectroscopic measurements in colloidal systems.

Purpose of the Study:

To investigate the impact of laser intensity on photon correlation spectroscopy measurements of gold nanocrystal superlattices.
To characterize and correct for thermal blooming effects in PCS measurements.
To accurately determine the particle size of gold nanocrystals within superlattices.

Main Methods:

Photon correlation spectroscopy (PCS) was employed to measure autocorrelation spectra of gold nanocrystal superlattices.
Experiments were conducted under varying intensities of an incident laser beam.
A fitting procedure incorporating a second cumulant term was developed to account for thermal blooming.

Main Results:

Increasing laser intensity led to thermal blooming, which shifted the autocorrelation spectra towards shorter correlation times.
The second cumulant term in the fitting analysis effectively corrected for the spectral shifts caused by thermal blooming.
Accurate gold nanoparticle sizes were obtained after correcting for the thermal blooming artifact.

Conclusions:

Thermal blooming is a significant factor affecting PCS measurements of gold nanocrystal superlattices at higher laser intensities.
The developed correction method using a second cumulant term is effective for obtaining reliable particle size data.
This study highlights the importance of accounting for laser-induced artifacts in spectroscopic characterization of nanomaterials.