Self-assembled thiol

The use of tetraoctylammonium salt as phase transfer reagent has been introduced by Brust [199] for the preparation of gold colloids in the size domain of 1-3 nm. This one-step method consists of a two-phase reduction coupled with ion extraction and self-assembly using mono-layers of alkane thiols. The two-phase redox reaction controls the growth of the metallic nuclei via the simultaneous attachment of self-assembled thiol monolayers on the growing clusters. The overall reaction is summarized in Equation (5). 

Postlethwaite TA, Hutchison JE, Hathcock KW, Murray RW. 1995. Optical, electrochemical and electrocatalytic properties of self-assembled thiol-derivatized porphyrins on transparent gold-hlms. Langmuir 11 4109. 

Au(lOO) electrodes. Self-assembled thiol layers on Au(lOO) have also been studied. 

The most common procedure for estimating X consists in measuring the thermodynamically significant electrosorption valency l and in evaluating its extrathermodynamic contributions k vkw and g of Eqs. (26) and (27) in order to extract the X value. A more direct extrathermodynamic procedure that relies exclusively on the Gouy-Chapman theory can be applied to the important class of self-assembled thiol monolayers anchored to a metal surface. 

IV. ELECTROSORPTION VALENCY AND PARTIAL CHARGE TRANSFER COEFFICIENT IN SELF-ASSEMBLED THIOL MONOLAYERS... 

Crooks group used STM to locally etch an Au(l 11) electrode coated with a self assembled thiol monolayer, and they were able to fabricate features from a few tens of nanometers to several mi-crometers. They studied the dependence of nanodeposition on the type of solution and electrode potential. 

T Sawaguchi, T Matsue, I Uchida. Catalytic capability of diaphorase bound to a self-assembled thiol monolayer at a gold electrode. Bioelectrochem Bioenerg 29 127-133, 1992. 

It s remarkable that the cracking pattern of the monolayer (p2) is significantly different from the multilayer whereas the Pi peak exhibits a similar cracking pattern. This shows that at 510 K intact molecules of the SAM desorb but that the p2 peak originates from a decomposition product. The fact that no mass 199 can be seen but mass 34 (H2S) leads to the conclusion, that in this case the C-S bond is broken. This idea is supported by literature dealing with alkanethiols [12] and similar self-assembling thiols [13] on gold, as well as on other metals, for example on Cu [14,15],... 

Rickert et al. described a sensor for the detection of antibodies against the foot and mouth disease virus [123-125]. Synthetic peptides constituting an epitope of the virus were immobihsed using activated self-assembled thiols. The antibodies were detected in a flowing solution in real time. Regeneration of the surface was also performed. 

M (d) KCl, as obtained at —1.000 V/SCE over the frequency range from 0.1 to 10 Hz. At frequencies < 102 Hz all Bode plots coincide hence, only the experimental points for the lower KCl concentration were reported. The solid curves are least-squares fits to the simple equivalent circuit of inset 2, which consists of the electrolyte resistance Rq, in series with an RtQ mesh representing the self-assembled thiol and a further RdCd mesh representing the diffuse... 

G. M. Whitesides self-assembled thiol monolayers on gold... 

Lu X, Yuan H, Zuo G, Yang J (2008) Study of the size and separation of pinholes in the self-assembled thiol-porphyrin monolayers on gold electrodes. Thin Solid Films 516 (18) 6476-6482... 

Mezour, M.A., Cornut, R., Hussien, E.M., Morin, M., Mauzeroll, J. Detection of hydrogen peroxide produced the oxygen reduction reaction at self-assembled thiol-porphyrin monolayers on gold using SECM and nanoelectrodes. Langmuir 2010, 26, 13000-13006. 

The modification and functionabzation of metal electrodes with self-assembled thiol adlayers [66, 67] opens up many possibilities for electrochemical applications. At present, this very active field is centered on the studies of the electrochemical properties of self-assembled monolayers (SAMs) [68, 69]. In short, electrochemical deposition represents a promising technique for the preparation of Cu-NPs due to its ease of use, low cost, environmental friendliness and convenience of manufacture. In particular, the high sensitivity and low cost of the SPEs when using Cu-NPs should lead to their widespread use in a variety of scientific and medical fields, including medical diagnostics. 

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