Constructing different `bridges' for interfacial electron transfer in azobenzene LB/SAM composite bilayers

Scanning Tunneling Microscopy, Fourier Transform Infrared Spectroscopy, and Electrochemical Characterization of 2-Naphthalenethiol Self-Assembled Monolayers on the Au Surface: A Study of Bridge-Mediated Electron Transfer in Ru(NH3)62+|Ru(NH3)63+ Redox Reactions

“…It has been previously reported that, in the case of both aromatic and heteroaromatic thiols, the electron-transfer reaction is facilitated by the presence of highly delocalized π-electrons in the aromatic ring and also by the extended conjugation of the molecules. − This property of the aromatic SAM is extensively used for sensor and catalysis applications. − The aromatic SAM can also be used as a molecular bridge to study the effects of different interaction forces and ionic and hydrogen bonding in the long-range electron-transfer reaction. The observed results were attributed to the tunneling process because of the presence of delocalized π-electrons in the aromatic ring, which acts as a bridge between the electrode surface and the redox probe. − In our case, the facile nature of the electron-transfer reaction of the ruthenium complex at the SAM−solution interface suggests a tunneling process, where the naphthalene ring with the delocalized π-electrons acts as a bridge between the monolayer-modified electrode and the ruthenium complex.…”

“…The observed results were attributed to the tunneling process because of the presence of delocalized π-electrons in the aromatic ring, which acts as a bridge between the electrode surface and the redox probe. [31][32][33] In our case, the facile nature of the electron-transfer reaction of the ruthenium complex at the SAM-solution interface suggests a tunneling process, where the naphthalene ring with the delocalized π-electrons acts as a bridge between the monolayer-modified electrode and the ruthenium complex.…”

Electrocatalytic studies of Cytochrome c functionalized single walled carbon nanotubes on self-assembled monolayer of 4-ATP on gold

“…Homogeneous and well-dispersed CNTs in aqueous and nonaqueous media formed with the aid of polymers and surfactants were reported earlier [44][45][46][47][48]. Here we have used analogous method to disperse the SWNTs in pH 6.5 phosphate buffer solution.…”

Electron transfer studies on cholesterol LB films assembled on thiophenol and 2-naphthalenethiol self-assembled monolayers

“…Recently Ashwell et al have studied the rectification behavior in hybrid Au/SAM/LB device [8]. Yu et al have studied the different bridges for interfacial electron transfer in azobenzene LB/SAM composite bilayers [9]. While cholesterol and its derivatives are known to form Langmuir monolayers at airwater interface [10][11][12][13] and LB films on substrates coated with hexamethyldisilazane [14], there are very few studies of these film using electrochemical and surface probe techniques [15].…”