Plasmonic smart dust for probing local chemical reactions

Area of Science:

• Materials Science
• Heterogeneous Catalysis
• Surface Chemistry

Background:

• Probing surface reactions under realistic conditions is challenging.
• Conventional methods require high vacuum or average measurements.
• Plasmonic nanoparticles offer extreme light focusing for subwavelength analysis.

Purpose of the Study:

• To develop an all-optical probing technique for real-time, local chemical reaction monitoring.
• To utilize plasmonic nanoparticles as optical reporters for surface environmental changes.
• To demonstrate a novel method for studying surface catalytic processes.

Main Methods:

• Developed "plasmonic smart dust" using silica shell-isolated gold nanoparticles.
• Employed an all-optical probing technique for in situ measurements.
• Investigated hydrogen dissociation and uptake in palladium using "dust-on-film" and "film-on-dust" platforms.

Main Results:

• Demonstrated real-time, label-free monitoring of local chemical reactions.
• Showcased the ability of plasmonic nanoparticles to concentrate light and report environmental changes.
• Successfully encoded chemical reaction information as optical signals in single-particle measurements.
• Validated the technique across various surface morphologies.

Conclusions:

• The plasmonic smart dust technique provides high-resolution, in situ probing of surface reaction kinetics.
• This method overcomes limitations of conventional surface analysis techniques.
• Paves the way for developing advanced reaction sensors for diverse chemical applications.