Noble-Metal-Free MIL-101(Cr)@rGO for Formaldehyde SERS Detection

Area of Science:

• Analytical Chemistry
• Materials Science

Background:

• Volatile organic compounds (VOCs) detection is vital for food safety, identifying spoilage and adulterants.
• Traditional Surface-Enhanced Raman Spectroscopy (SERS) relies on costly and unstable noble metal substrates (gold, silver).

Purpose of the Study:

• To develop and evaluate a novel, cost-effective SERS substrate using a hybrid metal-organic framework (MOF) and reduced graphene oxide (rGO).
• To assess the substrate's sensitivity and stability for detecting food-related volatile organic compounds.

Main Methods:

• Fabrication of a hybrid MOF-rGO SERS active substrate.
• Utilizing SERS to detect formaldehyde (FA), a representative VOC, at a characteristic peak (1452 cm⁻¹).
• Evaluating the substrate's sensitivity and reproducibility (RSD).

Main Results:

• The hybrid MOF-rGO substrate demonstrated good sensitivity for formaldehyde detection.
• The relative standard deviation (RSD) was found to be 16.95%.
• The substrate achieved detection at the characteristic peak of 1452 cm⁻¹.

Conclusions:

• The developed MOF-rGO substrate offers a promising, noble metal-free alternative for SERS applications.
• This low-cost, easily synthesized material can be fine-tuned for sensitive VOC detection in food safety.
• Potential for creating less-toxic, integrated detection systems for industrial use.