Reference : Molecular conformation and electronic properties of protoporphyrin-IX self-assembled ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/26611
Molecular conformation and electronic properties of protoporphyrin-IX self-assembled monolayers adsorbed on a Pt(111) surface
English
Humbert, C. [ > > ]
Volcke, C. [ > > ]
Sartenaer, Y. [ > > ]
Peremans, A. [ > > ]
Thiry, P. A. [ > > ]
Dreesen, Laurent mailto [Université de Liège - ULiège > Département de physique > Biophotonique >]
2006
Surface Science
Elsevier Science
600
3702-3709
Yes (verified by ORBi)
International
0039-6028
Amsterdam
The Netherlands
[en] Monolayers of protoporphyrin-IX molecules are prepared on a Pt(111) surface by a self-assembly process in order to manufacture organic devices with controlled electronic properties. Scanning tunnelling microscopy (STM) and two-colour sum-frequency generation (2C-SFG) are performed ex situ in ambient air, in order to characterize their molecular conformation and electronic properties at the monolayer level, respectively. STM measurements performed with functionalized gold tips reveal a high covering rate of the metal surface. 2C-SFG measurements highlight CH stretching modes of vinyl substituted groups (R-CH=CH2) in the 2800–3200 cm-1 infrared spectral range and particular electronic features in the visible spectral range, i.e. a Soret band red shift and band separation compared to the liquid phase. Moreover, similar measurements are performed on Zn(II)Protoporphyrin-IX and 5-[p-(6-mercaptohexoxy)-phenyl]-10,15,20-triphenylporphin films for comparison. These results suggest a film conformation with the molecules having different tilt angles
with respect to the substrate normal, depending on the ion metal presence or the chain length bonded to the porphyrin moiety.
Researchers ; Professionals
http://hdl.handle.net/2268/26611
10.1016/j.susc.2006.01.072

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