Monolayers molecular

If we consider the optical response of a molecular monolayer of increasing surface density, the fomi of equation B 1.5.43 is justified in the limit of relatively low density where local-field interactions between the adsorbed species may be neglected. It is difficult to produce any rule for the range of validity of this approximation, as it depends strongly on the system under study, as well as on the desired level of accuracy for the measurement. The relevant corrections, which may be viewed as analogous to the Clausius-Mossotti corrections in linear optics, have been the... 

Bram C, Jung C and Stratmann M 1997 Self assembled molecular monolayers on oxidized inhomogeneous aluminum surfaces Fres. J. Anal. Chem. 358 108-11... 

Another approach to molecular assembly involves siloxane chemistry [61]. In this method, the electrically or optically active oligomers are terminated with tii-chlorosilane. Layers are built up by successive cycles of dip, rinse, and cure to form hole transport, emissive, and electron transport layers of the desired thicknesses. Similar methods have also been used to deposit just a molecular monolayer on the electrode surface, in order to modify its injection properties. 

H. Ohtani, C.-T. Kao, M.A.V. Hove, and G. Somorjai, A tabulation and classification of the stmctures of clean solid surfaces and of adsorbed atomic and molecular monolayes as determined from low energy electron diffraction patterns, Progress in Surface Science 23(2,3), 155-316 (1986) and reference therein. 

Patterson JE, Lagutchev AS, Huang W, Dlott DD. 2005. Ultrafast dynamics of shock compression of molecular monolayers. Phys Rev Lett 94 015501. 

T.J. Meyer The observation of emission from the films is not surprising. The films described are rather thick and consist of the equivalent of many molecular monolayers. No doubt we are observing emission from layers well away from the electrode surface. Emission is not observed from thin films, suggesting that efficient quenching of excited states in the layers near the electrode does occur. 

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... 

Krzeminski C, Delerue C, Allan G, Vuillaume D, Metzger RM (2001) Theory of rectification in a molecular monolayer. Phys Rev B 64 085405... 

Girlando A, Sissa C, Terenziani F, Painelli A, Chwialkowska A, Ashwell GJ (2007) In situ spectroscopic characterization of rectifying molecular monolayers self-assembled on gold. Chem Phys Chem 8 2195-2201... 

Thieblemont F, Seitz O, Vilan A, Cohen FI, Salomon E, Kahn A, Cahen D (2008) Electronic current transport through molecular monolayers comparison between Hg/alkoxy and alkyl monolayer/Si(100) junctions. Adv Mater 20 3931-3936... 

The coefficient of infrared light absorption by an adsorbed molecular monolayer of the surface concentration N/F depends both on the angle of incidence reckoned from a normal to the surface and on the effective absorption cross-section o(ft>) 122... 

Guided mode calculations were also carried out to compare the sensor response of several waveguide systems. In these simulations a model molecular monolayer is represented by a 2-nm thick layer with a refractive index of n 1.5. The optical properties of this model layer are typical of a dense layer of organic molecules on a substrate1 41, and are a reasonable approximation for a streptavidin protein layer bound to a biotinylated surface, the experimental model system we use to characterize our sensors. The ambient upper cladding was assumed to be water with a refractive index of n 1.32. For all examples, the lower cladding was assumed to be Si02 with an index of n 1.44. In the simulations, the effective index of... 

An open-tubular column is a capillary bonded with a wall-supported stationary phase that can be a coated polymer, bonded molecular monolayer, or a synthesized porous layer network. The inner diameters of open-tubular CEC columns should be less than 25 pm that is less than the inner diameters of packed columns. The surface area of fused silica tubing is much less than that of porous packing materials. As a result, the phase ratio and, hence, the sample capacity for open-tubular columns are much less than those for packed columns. The small sample capacity makes it difficult to detect trace analytes. 

One way to increase the phase ratio of open-tubular columns is to use a polymeric stationary phase instead of a bonded molecular monolayer (Figure 6). 

It is obvious that such processes involving monomolecular film transfers will easily be disturbed by defects arising from various sources. As will be shown in the following text, these defects are in most cases easily detected. The structural analysis of the molecular ordering within a single LB monolayer is important both to understand how the environment in the immediate vicinity of the surface (i.e., solid) affects the structure of the molecular monolayer and to ascertain how the structure of one layer forms a template for subsequent layers in a multilayer formation. 

Bredenbeck J, Ghosh A, Smits M, Bonn M (2008) Ultrafast two dimensional-infrared spectroscopy of a molecular monolayer. J Am Chem Soc 130 2152... 

Molecular Monolayers as Semiconducting Channels in Field Effect Transistors... 

Operation of the Molecular Monolayer Field-Effect Transistor. 216... 

Methods for Molecular Monolayer Organization on Device Surfaces. 219... 

The gradual channel approximation (described above) may fail, as the channel length of the FET is shortened. The electrostatics of the FET limit L > 1.5 q in a molecular FET, where the dielectric constant of the gate dielectric layer and semiconductor channel may be similar [22, 23]. This is particularly important in monolayer transistors, as many monolayer FETs studied have been limited to tens of nanometers channel length by the tens of nanometers size of ordered domains, and therefore require thin gate dielectric layers. Only recently (described below) have routes been shown to form more extended ordered molecular monolayers, allowing micron-scale FET channel lengths to be explored. 

---