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A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
Published on: May 9, 2014
Surface-confined energy transfer in mixed self-assembled monolayers
Fengting Lü1, Yu Fang, G J Blanchard
1School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an, PR China.
Langmuir : the ACS Journal of Surfaces and Colloids
|July 9, 2008
Summary
We studied excitation transport in mixed self-assembled monolayers using naphthalene and dansyl derivatives. Excitation transfer efficiency scaled with surface loading, revealing insights into interface heterogeneity.
Area of Science:
- Surface science
- Photochemistry
- Spectroscopy
Background:
- Self-assembled monolayers (SAMs) are crucial for controlling surface properties.
- Understanding energy transfer in mixed SAMs is key for optoelectronic applications.
Purpose of the Study:
- To investigate excitation transport between naphthalene and dansyl chromophores in mixed SAMs.
- To correlate energy transfer efficiency with varying surface loading ratios.
Main Methods:
- Fabrication of SAMs with naphthalene and dansyl derivatives on silica.
- Characterization using X-ray photoelectron spectroscopy (XPS), ellipsometry, and contact angle measurements.
- Analysis of excitation transfer via steady-state and time-resolved fluorescence spectroscopy.
Main Results:
- Confirmed excitation transfer from naphthalene (donor) to dansyl (acceptor) chromophores.
- Observed energy transfer efficiency directly scales with chromophore surface loading densities.
- Donor lifetimes decreased with increasing acceptor density, independent of the donor/acceptor ratio.
Conclusions:
- Findings suggest a heterogeneous adlayer structure rather than a homogeneous distribution.
- The study provides valuable information on the structural heterogeneity at interfaces in mixed SAM systems.
