Langmuir—Blodgett deposition poly

Seki, T, and Ichimura, K. Formation and Langmuir-Blodgett Deposition of Monolayers of Poly(vinyI alcohol)s Bearing Azobenzene Side-Chains of Varied Spacer Length. Thin Solid Films 179, 365 (1989). 

The material system is a Langmuir-Blodgett film of the S enantiomer of a chiral polymer deposited on a glass substrate. The polymer is a poly(isocyanide)30 functionalized with a nonlinear optical chromophore (see Figure 9.14). In this particular system the optical nonlinearity and chirality are present on two different levels of the molecular structure. The chirality of the polymer is located in the helical backbone whereas the nonlinearity is present in the attached chromophores. Hence, this opens the possibility to optimize both properties independently. 

In both cases the top layer of these layered polyelectrolyte films contains many ion sites that can bind redox ions by ion exchange vdth the electrolyte solution. Homo polypeptides such as poly(L-lysine) and poly(L-glutamic add) have been employed to form layered polyelectrolyte films with Fe(CN)6 " electrostatically adsorbed onto ammonium sites in poly(lysine) [45]. Modified electrodes with polyelectrolytes mono-layers have also been deposited using the Langmuir-Blodgett technique [46-48]. 

The macroscopic alignment of polymer chains was also achieved by depositing soluble poly(p-phenylenes), such as 37 or poly(3-thiophenes) such as 26, from solution by the Langmuir-Blodgett technique. However, low polarisation ratios ( u/ x) were found for electroluminescence (3 1). 

Tedeschi, C., Fontana, M. P., Pieroni, O., Dei, L., Wilde, J., Pearson, C., Petty, M. C., and Tanner, B. K., Deposition and Characterisation of Langmuir-Blodgett Films of an Azobenzene-containing Poly-L-lysine. Thin Solid Films 335,197 (1998). 

The array of PPy dots (diameter 80-180 nm) was patterned in a parallel fashion using block copolymer micelle as a soft template [256]. The Langmuir-Blodgett (LB) film composed of PS-fi-poly(2-vinylpyridine) was deposited onto the solid substrate, and the ahgned PPy dots could be formed through the chemical oxidation polymerization of pyrrole in the presence of the block copolymer micelle template. The chemical differentiation (hydrophilic vs. hydrophobic) between the core and the corona in block copolymer micelle led to spatially-limited PPy growth. 

Langmuir-Blodgett and Langmuir-Schaeffer deposition Co-deposition of poly(3-hexylthiophene) and Au NPs encapsulated by dodecanethiol [179. 180]... 

Polymerization of extremely thin poly(acetylene) films (< 1 pm) on crystal surfaces by epitaxial growth (e.g., on frozen benzene) [40] also induced orientation in the deposited polymer layer. Substituted poly(pyrrole) films with a high anisotropy can be produced by the Langmuir-Blodgett technique [41 3]. 

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