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Dipole-Induced Raman Enhancement Using Noncovalent Azobenzene-Functionalized Self-Assembled Monolayers on Graphene Terraces
- Source :
- ACS applied materialsinterfaces. 13(8)
- Publication Year :
- 2021
-
Abstract
- Graphene is a promising material in the field of interface science, especially for noncovalent functionalization, sensing, and for applications in catalysis and nanoelectronics. The noncovalent self-assembly of aromatic molecules on graphene promotes electronic coupling through π-π interactions that allows for quenching of the fluorescence of adsorbent molecules and the enhancement of their Raman spectra via graphene-enhanced Raman spectroscopy (GERS). Although recent work has explored the Raman enhancement on mono- and bilayer graphene, the layer dependence of both electronic phenomena (i.e., fluorescence quenching and Raman enhancement) has largely remained underexplored. Similarly, the effect of near-surface molecular dipoles on GERS has sparsely been examined. In this work, we employ self-assembled monolayers of azobenzene-decorated triazatriangulene molecules (AzoTATA) on graphene terraces to examine the effect of switchable molecular dipoles on the GERS effect, which occurs as a function of azobenzene photoisomerization. Furthermore, using empirical and computational methods, we present a systematic study for deriving the mechanism of GERS enhancement and fluorescence quenching on graphene terraces.
- Subjects :
- Materials science
Quenching (fluorescence)
Photoisomerization
Graphene
Self-assembled monolayer
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Photochemistry
01 natural sciences
0104 chemical sciences
law.invention
symbols.namesake
chemistry.chemical_compound
Azobenzene
chemistry
law
Monolayer
symbols
General Materials Science
0210 nano-technology
Raman spectroscopy
Bilayer graphene
Subjects
Details
- ISSN :
- 19448252
- Volume :
- 13
- Issue :
- 8
- Database :
- OpenAIRE
- Journal :
- ACS applied materialsinterfaces
- Accession number :
- edsair.doi.dedup.....9dae39ec51dca3b5e5070ec47ecc957d