Chemical functionality in self-assembled monolayers: structural and electrochemical properties

Carbon and gold electrodes as electrochemical transducers for DNA hybridisation sensors

“…Self-assembly provide one of the most elegant approaches to obtain well defined and organised surfaces that can be an excellent platform for biosensor applications. General features of self-assembled monolayers (SAMs) onto gold surfaces have been summarised in several papers and reviews (Chidsey and Loiacono, 1990;Wink et al, 1997;Chaki and Vijayamohanan, 2002) and have been briefly covered in the following section. Even more elegant approaches involve the direct chemisorption of thiol-modified DNA probes onto gold surfaces.…”

Insights into the surface and redox properties of single-walled carbon nanotube—cobalt(II) tetra-aminophthalocyanine self-assembled on gold electrode

“…The gold electrode used for the SAM was first cleaned using the usual procedure [12] and [51]. SAMs were obtained by the usual adsorption method from dilute solution of adsorbates [53]. In summary, the bare Au electrode was first polished in an aqueous slurry of alumina (<10 μm) on a SiC-emery paper (type 2400 grit), and then to a mirror finish on a Buehler felt pad.…”

“…The modification of the Au with any of the species resulted in increased capacitive charging current of the bare gold electrode. Such behaviour is characteristic of SAMs with hydrophilic end groups [25], [26] and [53]. Hydrophilic SAMs, unlike hydrophobic (such as the alkanethiols) are known to increase the capacitive currents.…”

Ion/Surface Reactions at Monolayers in Solution: A Combined Surface Enhanced Raman–X-Ray Photoelectron Spectroscopic Investigation of the Chemical Modification of a 2-Mercaptobenzothiazole Monolayer on Polycrystalline Au Films

“…They also establish that the electron transfer at the electrolyte-electrode interface is the driving force for the reaction. Issues associated with electron transfer at the monolayer-electrolyte interface has been the subject of intense investigation (25)(26)(27)(28)(29)(30)(31)(32)(33). Electron tunneling from the underlying substrate is suggested to be the most probable pathway, although the involvement of the adlayer has also been suggested.…”