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Updated: Jun 18, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Measuring surface charge density and particle height using surface plasmon resonance technique.

Xiaonan Shan1, Xinping Huang, Kyle J Foley

  • 1Department of Electrical Engineering, Center for Bioelectronics and Biosensors, Biodesign Institute, Arizona State University, Tempe, Arizona 85287-5801, USA.

Analytical Chemistry
|November 27, 2009
PubMed
Summary
This summary is machine-generated.

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This study introduces a novel method using surface plasmon resonance (SPR) to measure surface charge density and particle height. The technique accurately quantifies electrostatic interactions between charged particles and surfaces.

Area of Science:

  • Surface science
  • Nanotechnology
  • Analytical chemistry

Background:

  • Surface charge density and particle height are critical parameters in various scientific fields.
  • Existing methods for measuring these properties can be complex or limited in scope.
  • Understanding electrostatic interactions is key to controlling interfacial phenomena.

Purpose of the Study:

  • To develop and validate a new method for simultaneously measuring surface charge density and particle height.
  • To leverage the high sensitivity of surface plasmon resonance (SPR) for nanoscale measurements.
  • To determine the surface charge density of functionalized gold surfaces.

Main Methods:

  • Utilizing surface plasmon resonance (SPR) detection to monitor changes in particle height.

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  • Employing numerical simulations to correlate SPR signals with particle height and surface charge density.
  • Conducting systematic experimental investigations with varying buffer concentrations, particle sizes, and concentrations.

    • Main Results:

    • Established a strong correlation between SPR signal, particle height, and surface charge density.
    • Demonstrated good agreement between numerical simulations and experimental findings.
    • Successfully determined the surface charge density of gold surfaces modified with different molecules.

    Conclusions:

    • The developed SPR-based method provides an accurate and sensitive approach for measuring surface charge density and particle height.
    • This technique offers a versatile tool for characterizing charged surfaces and particles.
    • The method can be extended to determine particle charges when surface charge density is known.