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Au nanoparticles decorated ZnO/ZnFe2O4 composite SERS-active substrate for melamine detection
Mohit Tiwari1, Aditya Singh1, Samit Dureja1
1Department of Chemical Engineering, Indian Institute of Technology, Delhi, 110016, India.
Talanta
|October 12, 2021
Summary
This study introduces a novel gold nanoparticle-decorated zinc ferrite-zinc oxide (Au-ZZF) nanostructure for highly sensitive surface-enhanced Raman scattering (SERS) detection of trace chemicals like R6G and melamine.
Area of Science:
- Nanomaterials Science
- Chemical Sensing
- Spectroscopy
Background:
- Surface-enhanced Raman scattering (SERS) utilizes plasmonic nanoparticles and semiconductors for trace chemical sensing.
- Oxide functional organic nanostructures offer potential for enhanced SERS performance.
Purpose of the Study:
- To develop and evaluate a novel Au-ZZF nanocomposite for sensitive SERS detection.
- To investigate the SERS enhancement mechanism and theoretical underpinnings.
Main Methods:
- Synthesis of ZZF nanostructure and decoration with gold nanoparticles (AuNPs).
- SERS measurements for Rhodamine 6G (R6G) and melamine detection across various concentrations.
- Density Functional Theory (DFT) studies to determine melamine adsorption orientation.
Main Results:
- Achieved a SERS enhancement factor of 1.6 × 10^8 for R6G (10^-6 M - 10^-12 M).
- Detected melamine with a limit of detection as low as 0.39 μM and an enhancement factor of 1.37 × 10^7.
- DFT calculations elucidated the role of electron movement in SERS enhancement.
Conclusions:
- The Au-ZZF nanocomposite demonstrates high sensitivity and specificity for trace chemical detection via SERS.
- The facile synthesis and excellent performance make it a promising SERS substrate.
- Understanding the molecule-substrate interaction through DFT enhances SERS applications.
