Thin self-assembly

The device yield of TFTs with molecular gate dielectrics would be expected to be low, because of defects in the thin self-assembled monolayer arising from the imperfect surface of the evaporated aluminum bottom electrode. Results obtained on... 

Alternative to fibers and 2D and 3D woven or nonwoven networks thereof formed as either self-supporting structures or as a hydrogel, it is possible to self-assemble peptides into thin self-assembled monolayers (SAMS) or multilayer structures. Such structures have been reported to act as membranes for controlled diffusion of ions and controlled movement of body fluids and contaminants (Ellis-Behnke et al., 2006, 2007 Holmes et al., 1999). Alternatively, various techniques have been put in place to provide coatings on various substrates ranging from tissue to metals and inorganics, for example, mica (Boden et al., 2002 Haynie, 2005,2007 Haynie and Zhi, 2007 Yoo et al., 2008). 

Recently, Yan et al. [53] reported on a similar bis(trichlorosilyl)-derivatized TPD (Fig. 9.22(c)). This was used to from thin, self-assembled layers of 1.8 nm on ITO. The introduction of this layer improved the efficiency compared with a reference device using bare ITO as the anode and a green-emissive polymer. They also crosslinked the compound within a blend with a hole-conducting polymer onto PEDOT/PSS. Overall, a factor of about two improvement was achieved, yielding very efficient green-emitting diodes (17 Cd/A). 

Photoisomerization of Azobenzenes in Molecularly Thin Self-Assembled Monolayers Photo-Orientation and Photo-Modulation of the Optical Thickness 110... 

Electron transfer cannot occur in blocking films. However, for very thin self-assembled monolayers (SAMs] of alkane thiols or oxide films, electrons can tunnel through the film and cause Faradaic reactions. Monolayer of alkane thiols can form spontaneously ordered adlayers on substrate like Au(lll] due to a strong interaction between the sulphur of the thiol and the gold substrate. These SAMs have received tremendous attention in recent years [209,210]. 

Yang NJ, Wan QJ, Wang XX (2005) Voltammetry of Vitamin B-12 on a thin self-assembled monolayer modified electrode. Electrochim Acta 50 2175-2180... 

The overwhelming majority of AEM studies on organic surfaces has concerned organic thin films on inorganic snbstrates and, in particvilar, those deposited via Langmnir-Blodgett or self-assembly processes [35]. These films... 

Monolayers of alkyl chains on siUcon are a significant addition to the family of SAMs. An abiUty to directly connect organic materials to siUcon allows a direct coupling between organic materials and semiconductors. The fine control of supedattice stmctures provided by the self-assembly technique offers a route for building organic thin films with, for example, electrooptic properties on siUcon. 

It will be clear that L-B films are intrinsically linked to self-assembly of molecules, and this has been recognised in the title of a recent overview book (Ulman 1991), An Introduction to Ultra thin Organic Films from Langnmir-Blodgett to Self-Assembly An Overview. 

Israelachvili and coworkers [64,69], Tirrell and coworkers [61-63,70], and other researchers employed the SFA to measure molecular level adhesion and deformation of self-assembled monolayers and polymers. The pull-off force (FJ, and the contact radius (a versus P) are measured. The contact radius, the local radius of curvature, and the distance between the surfaces are measured using the optical interferometer in the SFA. The primary advantage of using the SFA is its ability to study the interfacial adhesion between thin films of relatively high... 

Lee, I. and Wool, R.P., Controlling amine receptor group density on aluminum oxide surfaces by mixed silane self-assembly. J. Thin Solid Films, 379, 94 (2000). 

Recently an alternative approach for the description of the structure in systems with self-assembling molecules has been proposed in Ref. 68. In this approach no particular assumption about the nature of the internal interfaces or their bicontinuity is necessary. Therefore, within the same formahsm, localized, well-defined thin films and diffuse interfaces can be described both in the ordered phases and in the microemulsion. This method is based on the vector field describing the orientational ordering of surfactant, u, or rather on its curlless part s defined in Eq. (55). 

AB diblock copolymers in the presence of a selective surface can form an adsorbed layer, which is a planar form of aggregation or self-assembly. This is very useful in the manipulation of the surface properties of solid surfaces, especially those that are employed in liquid media. Several situations have been studied both theoretically and experimentally, among them the case of a selective surface but a nonselective solvent [75] which results in swelling of both the anchor and the buoy layers. However, we concentrate on the situation most closely related to the micelle conditions just discussed, namely, adsorption from a selective solvent. Our theoretical discussion is adapted and abbreviated from that of Marques et al. [76], who considered many features not discussed here. They began their analysis from the grand canonical free energy of a block copolymer layer in equilibrium with a reservoir containing soluble block copolymer at chemical potential peK. They also considered the possible effects of micellization in solution on the adsorption process [61]. We assume in this presentation that the anchor layer is in a solvent-free, melt state above Tg. The anchor layer is assumed to be thin and smooth, with a sharp interface between it and the solvent swollen buoy layer. 

Shaikh AV, Rajaram SM, Pathan HM, Min BK, Joo OS, Han SH (2008) CdSe thin film growth Primarily amorphous nanograins to self-assembled nanowires. J Electroanal Chem 615 175-179... 

Toyoda T, Kobayashi J, Shen Q (2008) Correlation between crystal growth and photosensitization of nanostructured HO2 electrodes using supporting H substrates by self-assembled CdSe quantum dots. Thin SoUd Films 516 2426-2431... 

Joo, S.-W. (2006) Characterization of self-assembled phenyl and benzylisothiocyanate thin films on Au surfaces. Surface and Interface Analysis, 38, 173-177. 

Blockcopolymer microphase separation [9] Depending on the length of chemically different blocks of monomers in a block copolymer, ordered nanostructures can be obtained in bulk samples and thin films. The film morphology can differ significantly from the bulk morphology, but because the structure is determined by the pair-pair interaction of monomers and/or an interface, and it is a thermodynamically stable structure, it is classified as self-assembly. 

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