Au nanoflower-Ag nanoparticle assembled SERS-active substrates for sensitive MC-LR detection.

Area of Science:

• Nanotechnology
• Analytical Chemistry
• Environmental Science

Background:

• Microcystin-LR (MC-LR) is a potent toxin found in water bodies.
• Sensitive and reliable detection methods are crucial for environmental monitoring.
• Surface-enhanced Raman scattering (SERS) offers high sensitivity for molecular detection.

Purpose of the Study:

• To fabricate novel SERS-active substrates for enhanced detection.
• To develop a sensitive method for MC-LR detection in real water samples.
• To investigate the performance of gold nanoflower (Au NF)-silver nanoparticle (Ag NP) core-satellite assemblies.

Main Methods:

• Fabrication of SERS-active substrates using Au NF and Ag NPs.
• Assembly of core-satellite structures driven by aptamers.
• Detection of MC-LR using the fabricated SERS substrates.
• Analysis of samples from Tai lake water.

Main Results:

• The Au NF-Ag NP core-satellite assemblies demonstrated amplified SERS signals.
• Achieved sensitive detection of MC-LR.
• The limit of detection (LOD) for MC-LR was determined to be 8.6 ± 0.4 pM.
• Successful detection in Tai lake water samples.

Conclusions:

• The developed aptamer-driven Au NF-Ag NP assemblies are effective SERS substrates.
• This method enables sensitive and specific detection of MC-LR in environmental water.
• The SERS approach holds promise for water quality monitoring.