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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

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Single nanoparticle based optical pH probe.

Rebecca A Jensen¹, Jennifer Sherin, Steven R Emory

¹Department of Chemistry, Western Washington University, Bellingham, Washington 98225-9150, USA.

Applied Spectroscopy

|August 25, 2007

Summary

Researchers developed a nanoscale optical pH probe using silica-gold nanoparticles. This probe utilizes surface-enhanced Raman scattering (SERS) to accurately detect pH changes between 3 and 7, offering improved reliability with individual nanoparticles.

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Area of Science:

Nanotechnology
Optical Sensing
Spectroscopy

Background:

Development of nanoscale optical probes is crucial for precise chemical sensing.
Surface-Enhanced Raman Scattering (SERS) offers high sensitivity for molecular detection.
Silica-gold core-shell nanoparticles provide a versatile platform for SERS applications.

Purpose of the Study:

To engineer a nanoscale optical pH probe utilizing SERS.
To functionalize silica-gold core-shell nanoparticles with a pH-sensitive reporter.
To evaluate the pH sensitivity and reliability of the developed probe.

Main Methods:

Fabrication of silica-gold core-shell nanoparticles with plasmon modes in the red-to-near-infrared region.
Functionalization of nanoparticle surfaces with 4-mercaptopyridine (4-MPy), a pH-sensitive SERS reporter molecule.

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Analysis of SERS spectra of 4-MPy to determine pH sensitivity and compare individual nanoparticles versus aggregates.

Main Results:

The SERS spectra of 4-MPy demonstrated sensitivity to pH variations within the range of 3 to 7.
Individual silica-gold core-shell nanoparticles provided more consistent and reliable SERS spectra compared to nanoparticle aggregates.
The developed probe operates in the red-to-near-infrared spectral region.

Conclusions:

Silica-gold core-shell nanoparticles functionalized with 4-MPy serve as an effective nanoscale optical pH probe.
The probe exhibits reliable pH sensing capabilities in the acidic to neutral range (pH 3-7).
Utilizing individual nanoparticles enhances the spectral reliability of SERS-based pH measurements.