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Updated: Jan 13, 2026

Author Spotlight: Development and Application of SERS Flexible Substrates Using Synthesized AgNPs

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A High-Regularity Porous SERS Substrate Prepared by Two-Step Mild and Hard Anodization for Sorbic Acid Detection.

Chin-An Ku¹, Cheng-Hao Chiu¹, Chung-Yu Yu¹

¹Department of Mechanical Engineering, National Cheng Kung University, Tainan 701, Taiwan.

Sensors (Basel, Switzerland)

|January 10, 2026

Summary

We developed a novel solid-state substrate using ordered anodic aluminum oxide (AAO) for enhanced surface-enhanced Raman spectroscopy (SERS) detection. This method offers a simple, room-temperature fabrication process for sensitive detection of food preservatives.

Keywords:

AAO SERS anodic aluminum oxide high regularity sorbic acid surface-enhanced Raman scattering

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Last Updated: Jan 13, 2026

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A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants

A Filter-based Surface Enhanced Raman Spectroscopic Assay for Rapid Detection of Chemical Contaminants

Published on: February 19, 2016

Area of Science:

Materials Science
Nanotechnology
Analytical Chemistry

Background:

Traditional surface-enhanced Raman spectroscopy (SERS) substrates often rely on metal nanoparticles (MNPs), facing challenges like complex fabrication, poor control, and oxidation.
Solid-state SERS substrates present a promising alternative due to their stability and simplified preparation.

Purpose of the Study:

To develop a novel, ordered anodic aluminum oxide (AAO) substrate for enhanced SERS detection.
To investigate the use of hybrid pulse anodization (HPA) for controlled nanostructure fabrication at room temperature.
To evaluate the substrate's performance in detecting food preservatives.

Main Methods:

Fabrication of ordered AAO substrates using a two-step mild and hard anodization process (Hybrid Pulse Anodization - HPA).
Controlled nanostructure formation by varying anodization voltages (40 V, 110 V, 120 V) in the second step.
SERS detection of sorbic acid, a common food preservative, at concentrations ranging from 1000 ppm to 10 ppb.

Main Results:

Achieved AAO substrates with high total pore circumference, generating abundant SERS hot spots.
Demonstrated distinct characteristic SERS peaks for sorbic acid at 1640-1645 cm^-1.
Obtained an analytical enhancement factor of 1.02 × 10⁵ and a limit of detection (LOD) as low as 10 ppb for sorbic acid.

Conclusions:

The developed AAO substrate fabricated via HPA is an effective solid-state platform for sensitive SERS detection.
The high total pore circumference and resulting hot spots are key to the enhanced SERS signal.
This method provides a simple, room-temperature approach for fabricating high-performance SERS substrates for food safety applications.