Microstructured Waveguides with Polyelectrolyte-Stabilized Gold Nanostars for SERS Sensing of Dissolved Analytes

Area of Science:

• Nanotechnology
• Spectroscopy
• Materials Science

Background:

• Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical technique for detecting analytes at low concentrations.
• Developing stable and efficient SERS substrates is crucial for practical applications.
• Microstructured waveguides (MWGs) offer unique optical properties for sensing applications.

Purpose of the Study:

• To develop a novel SERS sensor for dissolved analytes using microstructured waveguides.
• To utilize polyelectrolyte-layer-stabilized gold nanostars as the SERS-active material within the MWG.
• To enhance sensor performance and sample preservation during analysis.

Main Methods:

• Fabrication of microstructured waveguides with a hollow core.
• Coating the inner surface of the MWG with a polyelectrolyte layer.
• Stabilization and immobilization of gold nanostars on the polyelectrolyte layer.
• Utilizing the MWG for SERS detection of dissolved analytes.

Main Results:

• The developed sensor demonstrated effective SERS sensing of dissolved analytes.
• The polyelectrolyte layer acted as a spacer, reducing nonlinear optical effects and stabilizing gold nanostars.
• The MWG design allowed for fine-tuning of optical properties and efficient light-matter interaction.
• The sensor preserved sample integrity, preventing coagulation and drying during signal acquisition.

Conclusions:

• Microstructured waveguides functionalized with polyelectrolyte-stabilized gold nanostars provide a robust platform for SERS sensing.
• This approach offers enhanced sensitivity and stability for dissolved analyte detection.
• The sensor design facilitates sample conservation, enabling reliable SERS measurements.