Langmuir-Blodgett films molecular electronics

Besides self-assembly on the surface of metals, another example of self-assembly is the formation of Langmuir-Blodgett monolayers on the surface or at the interface of liquids.47,48 One approach to molecular-based electronic devices that has made use of self-assembled Langmuir-Blodgett films is the crossbar-based defect-tolerant approach to molecular computing 49 Rotaxane molecules that depend on physical dislocations within the molecule to produce switching functionality have been designed such that they will... 

Verani and coworkers widely investigated stimuli-responsive soft materials with interesting optical and redox behaviors. Such materials are able to self-assembly in functional ordered structures, as Langmuir-Blodgett films and liquid crystals, and possess potential applications in molecular electronics and magnetic films as well. These compounds are mainly based on Co(II) (94), Co(III) (95), Cu(II) (96), Fe(II)/Fe(III) (97), and Ni (II) and Zn(II) (98). A recent overview dedicated to colloidal systems, and their application in different fields has recently appeared in the literature (99). 

Molecular Electronics Using Langmuir-Blodgett Films... 

Next, we discuss the concept of phonon-assisted reactions. In relation to thermal reactions, they can be assisted by phonon-mode softening leading to large-amplitude overdamped oscillations. In the case of a photochemical reaction, a strong electron-phonon coupling can assist in polymerization. Then some non-linear spectroscopic studies are discussed which illuminate on the dynamics of photopolymerization process. Then follows a discussion of results on reaction in a different kind of molecular assembly, the Langmuir-Blodgett films. Finally, some gas-solid interface reactions which produce polymers in a doped state are discussed. 

Punkka E. and Rubner M.F., Molecular Heterostructure Devices Composed of Langmuir-Blodgett Films of Conducting Polymers, J. Electron. Mater. 21, 1057-1063, 1992. 

Atto-engineering for more than a whole century is in permanent and almost infinite development. Theoretical background is related to the surface physics and chemistry, quantum and wave mechanics, and quantum electrodynamics. Discrete and constrained discrete models are convenient for describing related events. Tools and equipment are nano- and atto-dispersions and beams (demons, ions, phonons, infons, photons, electrons), ultra-thin films and membranes, fullerenes and bucky tubules, Langmuir-Blodgett systems, molecular machines, nano-electronic devices, and various beam generators. Output is, generally, demonstrated as finely dispersed particles (plasma, fluosol-fog, fluosol-smoke, foam, emulsion, suspension, metal, vesicle, dispersoid). 

S. Roth, M. Burghard, G. M. Fischer, Resonant tunneling and molecular rectification in Langmuir-Blodgett films in Molecular Electronics (Eds. J. Jortner, M. Ratner), Blackwell Science, Oxford, 1997, pp. 255-280. 

Therefore, investigators have shown considerable interest in the adoption of the Langmuir-Blodgett technique, or its modifications, to make molecular electronic devices using, in particular, as an active component, a light-transducing protein, such as BR. In fact, the ability of BR to form thin films with excellent optical properties and the intrinsic properties themselves make it an outstanding candidate for use in optically coupled devices. 

The highly oriented molecules in thin organic films such as Langmuir-Blodgett (LB) films and self-assembled monolayers (SAM) [1] are essential for some molecular functions. Non linear optical and opto-electronic properties are two of the most important and interesting functions of these molecular assemblies. In the past more than thirteen years, simulation of the primary process of photosynthesis using such molecular assemblies and its application to molecular photodiodes [2,3] have been one of the main subjects of our laboratory. 

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