Plasmonic Metamaterials for Nanochemistry and Sensing

Area of Science:

• Plasmonics and Nanomaterials Science
• Optical Sensors and Metamaterials
• Nanochemistry and Hot-Electron Applications

Background:

• Plasmonic nanostructures, initially for sensing, now show promise in chemistry and optoelectronics.
• Assemblies of nanostructures in metamaterials enhance optical properties like field enhancement and optical density of states.
• Optical sensors offer advantages over electronic ones, including high sensitivity, fast response, and immunity to interference.

Purpose of the Study:

• To review the sensing and nanochemistry applications of plasmonic metamaterials based on nanorod assemblies.
• To highlight the use of optical and electronic interrogation for these metamaterials.
• To showcase the potential of hot-electron generation for sensing and chemical reactions.

Main Methods:

• Fabrication of metamaterials using assemblies of plasmonic nanorods.
• Optical interrogation of metamaterial sensors, including functionalization for selective absorption.
• Electronic interrogation of metamaterials for nanochemistry applications, utilizing tunneling for hot-electron generation and plasmon excitation.

Main Results:

• Achieved record-high refractive index sensitivity in gold nanorod arrays for biosensing.
• Demonstrated ultrasound and hydrogen sensing capabilities using core-shell nanostructures.
• Developed a nanochemical platform for electrically driven chemical reactions and optical monitoring via hot-electron and inelastic tunneling.

Conclusions:

• Plasmonic nanorod metamaterials are versatile platforms for high-performance optical sensors and nanochemical applications.
• The integration of electronics, plasmonics, photonics, and chemistry at the nanoscale opens new application avenues.
• These metamaterials offer a scalable, cost-effective solution for fundamental research and industrial applications.