Electroless Gold-Modified Diatoms as Surface-Enhanced Raman Scattering Supports

Area of Science:

• Materials Science
• Nanotechnology
• Biomaterials

Background:

• Diatom frustules are natural porous biosilica with unique optical and mechanical properties.
• Surface-enhanced Raman scattering (SERS) requires functional substrates for signal amplification.

Purpose of the Study:

• To utilize gold-coated diatom frustules as a cost-effective SERS substrate.
• To investigate the SERS performance of this novel biomaterial-based substrate.

Main Methods:

• Diatom frustules were coated with gold using an electroless deposition process.
• The performance of the gold-coated frustules as a SERS substrate was evaluated using p-mercaptoaniline.

Main Results:

• The nanostructured surface morphology and smooth gold deposition resulted in excellent SERS activity.
• An impressive enhancement factor of approximately 10^5 was achieved for the p-mercaptoaniline Raman signal.

Conclusions:

• Gold-coated diatom frustules represent a promising, low-cost, and readily available SERS substrate.
• The unique properties of diatom-derived silica combined with gold nanocoatings enable highly sensitive molecular detection.