Organized assemblies, monolayers

Emberly EG, Kirczenow G (2001) Models of electron transport through organic molecular monolayers self-assembled on nanoscale metallic contacts. Phys Rev B 64(23) 235412... 

Fig. 13 Monolayer KETs assembled on SU8 organic gate dielectric layers configured to form different circuits, (a) dc transfer characteristics of an inverter at different supply voltages (Rdd) (b) output characteristics of a 7-stage ring oscillator, and (c) output of a 4-bit code generator (continuous line) and the preprogrammed code (dotted line)...

Vol. 16 Organized Monolayers and Assemblies Structure, Processes and Function. 

S. R Chenakin, Sputtering of organic molecular Monolayers self-assembled onto Ag(l 11) and Au(l 11) surfaces, Vacuum, 66, 157-166 (2002). 

Organized assemblies such as monolayer and multilayer thin-film samples offer a number of advantages as models with which to understand the fundamental aspects of electron transfer in heterogeneous systems ... 

Monolayers can be formed on electrode surfaces by irreversible adsorption or covalent attachment, or, in the form of organized assemblies, by Langmuir-Blodgett transfer and self-assembly techniques. 

C. D. Bain, A New Glass of Self-Assembled Monolayers Organic Thiols on Gallium Arsenide, Adv. Mater. 1992, 4(9), 591-594. 

Eor heterogeneous electron transfer, the use of ordered organic monolayers (self-assembled monolayers or SAMs) at electrode surfaces as blocking films either with electroactive species in the electrolyte [26] or with electroactive groups tethered at the opposite end of the blocking molecule from the covalent attachment end [27] has provided a method to study the effect of electrode-redox center distance and the effect of the electrode potential on the electron-transfer rate. 

In the mid-1960s, Hans Kuhn etal. began their stimulating experiments on monolayer organization [5]. A self-assembled monolayer (SAM) was introduced as a possible alternative to the LB films. The LB and SAM films have attracted much attention recently, because optoelectronics and molecular electronics have become areas at the frontier of materials science [6]. For more details of the historical aspects, the reader is referred to a relevant textbook [7] as well as to the Gaines book mentioned eartier. 

As mentioned above, SAMs are organic assemblies formed by the adsorption of molecules from solution or the gas phase onto the surface of solids. If the adsorbed molecules are chiral, the self assembled monolayer is also rendered chiral. The chirality of the molecule can be distributed within the monolayer interior or located at the terminus of the molecule. However, the chirality is only expressed when the chiral constituent is exposed at the monolayer surface. Chiral SAMs are used in chiral systems. The SAMs can be used to specifically interact with chiral species, such as proteins or amino acids. Chiral SAMs have been used in enantioselective crystallization. In this case, a racemic solution of a chiral molecule is crystallized on a chiral SAM. The chiral SAM serves as a nucleating surface for one of the enantiomers, thereby increasing its crystallization on the SAM. Thus, enantioselective crystallization is achieved. 

Organized Monolayers and Assemblies Structure, Processes and Function. Edited by D. M.i>ius and R. Miller... 

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