Influence of the Molecular Structure of Carboxyl-Terminated Self-Assembled Monolayer on the Electron Transfer of Cytochrome c Adsorbed on an Au Electrode:  In Situ Observation by Surface-Enhanced Infrared Absorption Spectroscopy

2008 ◽  
Vol 112 (3) ◽  
pp. 813-819 ◽  
Author(s):  
Xiue Jiang ◽  
Kenichi Ataka ◽  
Joachim Heberle
Keyword(s):  
Molecular Structure ◽  
Electron Transfer ◽  
Cytochrome C ◽  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
In Situ Observation ◽  
Infrared Absorption Spectroscopy ◽  
Self Assembled Monolayer ◽  
Surface Enhanced

A Two-Layer Gold Surface with Improved Surface Enhancement for Spectro-Electrochemistry Using Surface-Enhanced Infrared Absorption Spectroscopy

2009 ◽  
Vol 63 (9) ◽  
pp. 1068-1074 ◽  
Author(s):  
C. Nowak ◽  
C. Luening ◽  
W. Knoll ◽  
R. L. C. Naumann
Keyword(s):  
Cytochrome C ◽  
Absorption Spectroscopy ◽  
Infrared Absorption ◽  
Gold Surface ◽  
Growth Conditions ◽  
Infrared Absorption Spectroscopy ◽  
Optimum Conditions ◽  
Self Assembled Monolayer ◽  
Surface Enhanced ◽  
Reversible Reduction

A two-layer gold surface is developed for use with surface-enhanced infrared absorption spectroscopy (SEIRAS) consisting of a conducting underlayer onto which Au nanoparticles (AuNPs) are grown by self-catalyzed electroless deposition. AuNPs are grown on protruding substructures of the 25 nm thin underlayer. The enhancement factor of the two-layer gold surface is controlled by the growth conditions. Cytochrome c adsorbed to a self-assembled monolayer of mercaptoethanol is used as a reference system. Under optimum conditions the absorbance of the amide I band is increased by a factor of 5 versus the classical SEIRAS surface. Reversible reduction/oxidation of cytochrome c on the two-layer gold surface is shown to take place by cyclic voltammetry.

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