A New Smart Surface-Enhanced Raman Scattering Sensor Based on pH-Responsive Polyacryloyl Hydrazine Capped Ag...

Area of Science:

• Nanotechnology
• Materials Science
• Analytical Chemistry

Background:

• Surface-enhanced Raman scattering (SERS) requires optimized substrates for sensitive detection.
• Developing responsive nanomaterials is crucial for advanced sensing applications.

Purpose of the Study:

• To synthesize and characterize a novel pH-responsive silver nanoparticle (Ag@PAH) SERS substrate.
• To investigate the tunable SERS performance of Ag@PAH nanoparticles under varying pH conditions.

Main Methods:

• Preparation of Ag@PAH nanoparticles without reducing or end-capping agents.
• Evaluation of SERS performance and detection limits using Rhodamine 6G.
• Analysis of pH-dependent swelling-shrinking behavior of the PAH polymer shell.

Main Results:

• Ag@PAH nanoparticles demonstrated tunable SERS detection across a pH range of 4-9.
• The polymer shell's pH-responsive behavior controlled the distance between silver nanoparticles and analytes, tuning localized surface plasmon resonance (LSPR).
• An ultra-sensitive detection limit of 10^-12 M for Rhodamine 6G was achieved.

Conclusions:

• Ag@PAH nanoparticles represent a promising smart SERS substrate for trace analysis.
• The pH-responsive nature enables controlled and sensitive detection in various sensing applications.
• This work offers a new strategy for designing advanced SERS materials.