Grating-Integrated Gold Nanograsses Encapsulated with ZIF-8: A Quantitative and Ultrasensitive Surface-Enhanced Raman...

Area of Science:

• Materials Science
• Nanotechnology
• Analytical Chemistry

Background:

• Surface-enhanced Raman scattering (SERS) is a powerful technique for molecular detection.
• Developing highly sensitive and stable SERS substrates remains a challenge for practical applications.

Purpose of the Study:

• To propose and demonstrate a novel hybrid SERS substrate with enhanced sensitivity and quantitative detection capabilities.
• To investigate the structural and performance characteristics of the proposed substrate.

Main Methods:

• Fabrication of grating-integrated gold nanograsses (GIGN).
• Tip-selective encapsulation of GIGN with ZIF-8 nanospheres using polyvinylpyrrolidone (PVP) modification.
• Characterization of the hybrid substrate's morphology and SERS performance.

Main Results:

• The developed GIGN/tip-ZIF hybrid SERS substrate demonstrated high sensitivity, with detection limits as low as 10^-11 M.
• Quantitative detection ability was achieved, with a relative standard deviation of 5.59% for 4-aminothiophenol (4-ATP).
• A sigmoidal relationship (R² = 0.988) was observed between SERS intensity and analyte concentration over a wide range.

Conclusions:

• The GIGN/tip-ZIF hybrid SERS substrate offers superior sensitivity and quantitative analysis.
• The unique structure facilitates analyte adsorption and enhances SERS signals through "hotspots".
• These substrates show significant potential for detecting toxic substances in food safety, disease diagnosis, and environmental monitoring.