Dielectrophoretic positioning of single nanoparticles on atomic force microscope tips for tip-enhanced Raman...

Area of Science:

• Nanotechnology
• Spectroscopy
• Materials Science

Background:

• Tip-enhanced Raman spectroscopy (TERS) offers nanoscale vibrational analysis but relies on reproducible probe fabrication.
• Current methods for attaching nanoparticles to atomic force microscope (AFM) tips are often serial, labor-intensive, and lack scalability.

Purpose of the Study:

• To develop a parallel and scalable method for fabricating TERS tips.
• To improve the reproducibility and affordability of TERS probes.

Main Methods:

• Utilized dielectrophoresis for parallel and controlled positioning of individual plasmonic nanoparticles onto commercial AFM tips.
• Demonstrated the Raman signal enhancement capabilities of the fabricated TERS tips.

Main Results:

• Successfully positioned individual plasmonic nanoparticles on AFM tips using dielectrophoresis.
• Confirmed the enhanced Raman signal, validating the functionality of the dielectrophoresis-fabricated TERS tips.

Conclusions:

• Dielectrophoresis presents a novel, scalable approach for reproducible TERS tip fabrication.
• This method paves the way for more accessible and reliable nanoscale chemical analysis using TERS.