Imaging and sizing of diamond nanoparticles.

Area of Science:

• Nanotechnology
• Optical Physics
• Materials Science

Background:

• Highly refractive nanocrystals show potential as optical labels due to their size-dependent scattering properties.
• Environmental factors like background scatter and refractive index variations typically affect optical measurements.
• Previous research has not extensively explored the use and sizing of these nanocrystals as optical labels in various environments.

Purpose of the Study:

• To investigate the use of highly refractive nanocrystals as optical labels.
• To determine the reliability of nanocrystal sizing based on scattering properties.
• To assess the impact of environmental disturbances on nanocrystal optical labels.

Main Methods:

• Imaging nanocrystal samples at sub-video frame rates.
• Analyzing diamond nanocrystals on a glass substrate in air and a polymer matrix.
• Measuring the brightness of diffraction-limited spots for particle sizing.

Main Results:

• Environmental disturbances have minimal effect on the size-dependent scattering of highly refractive nanocrystals.
• The brightness of a diffraction-limited spot reliably indicates particle size within the Rayleigh scattering limit.
• Successful demonstration of nanocrystal optical labels and their sizing in different environments.

Conclusions:

• Highly refractive nanocrystals are promising optical labels due to their stability against environmental variations.
• Nanocrystal sizing using scattered light brightness is a viable and reliable method.
• This technique opens possibilities for precise optical labeling and sizing in diverse applications.