Functionalized shell-isolated nanoparticle-enhanced Raman spectroscopy for selective detection of trinitrotoluene

Area of Science:

• Nanotechnology
• Spectroscopy
• Chemical Sensing

Background:

• Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical technique.
• Shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) offers enhanced versatility and sensitivity.
• Selective detection of explosive compounds like trinitrotoluene (TNT) is crucial for security applications.

Purpose of the Study:

• To develop a facile one-step method for preparing functionalized core-shell nanoparticles for selective TNT detection.
• To create tunable poly(2-aminothiophenol) (PAT) shells on gold nanoparticles for SHINERS applications.
• To investigate the controlled synthesis of PAT shells with uniform thickness and enhanced stability.

Main Methods:

• Preparation of gold nanoparticles coated with tunable poly(2-aminothiophenol) (PAT) shells.
• Control of PAT shell thickness (around 2 nm) by adjusting the molar ratio of sodium dodecylsulfate (SDS) to 2-aminothiophenol.
• Utilizing the Meisenheimer complex formation for selective detection of trinitrotoluene (TNT) via SHINERS.

Main Results:

• A facile one-step method for synthesizing functionalized core-shell nanoparticles was established.
• Tunable PAT shells with controlled thickness, uniformity, and improved chemical stability were successfully prepared.
• The developed nanoparticles demonstrated selective detection of TNT through SHINERS, leveraging Meisenheimer complex formation.

Conclusions:

• The novel functionalized core-shell nanoparticles are effective for selective TNT detection using SHINERS.
• The facile synthesis and tunable properties of PAT shells offer a promising platform for advanced chemical sensing.
• This work advances SHINERS technology for sensitive and selective detection of hazardous materials.