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Modifying photoisomerization efficiency by metallic nanostructures.

Shen Xu¹, Jiong Shan, Wei Shi

¹Key Lab for Micro and Nanophotonic Structures (Ministry of Education), Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai 200433,China.

|July 1, 2011

Summary

This summary is machine-generated.

The photoisomerization efficiency of azobenzene dye was significantly enhanced near gold nanoparticle films. This effect, driven by plasmon resonance and molecular decay, can be tuned by controlling dye-film distance for improved photochemical applications.

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Area of Science:

Physical Chemistry
Materials Science
Nanotechnology

Background:

Azobenzene dyes are crucial photoresponsive molecules.
Controlling photoisomerization efficiency is key for advanced applications.
Surface plasmon resonance (SPR) near metal nanoparticles influences molecular properties.

Purpose of the Study:

To investigate the modification of trans-to-cis photoisomerization efficiency of azobenzene dye.
To explore the role of gold nanoparticle films in tuning this efficiency.
To understand the underlying mechanisms and potential applications.

Main Methods:

Fabrication of gold nanoparticle films with varying structures.
Placement of azobenzene dye molecules near the gold films.
Transient fluorescence spectroscopy.
Surface-enhanced Raman scattering (SERS) measurements.

Main Results:

Photoisomerization efficiency was artificially modified from 0.09 to 0.38.
Enhancement and reduction of efficiency were observed due to competing SPR-enhanced optical fields and accelerated nonradiative decay.
Efficiency was further tunable by adjusting the dye-gold film distance.

Conclusions:

Gold nanoparticle films can significantly enhance or reduce azobenzene photoisomerization efficiency.
The observed effects are attributed to a balance between localized optical field enhancement and nonradiative decay.
This work provides a pathway for improving photoisomerization performance in photochemistry and photonics.