Can anyone explain me the difference between Langmuir Blodgett film, self assembled monolayers and layer by layer deposition(LbL).
Langmuir Blodgett monolayers (LBM) - technique produce several monolayers of surfactants. Layer-by-layer (LbL) deposition is a thin film fabrication technique. The films are formed by depositing alternating layers of oppositely charged materials with wash steps in between. This can be accomplished by using various techniques such as immersion, spin, spray, electromagnetism, or fluidics.
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Langmuir films are thin films of one material on a subphase of another material. They are commonly produced as films on water. Example ... Oil on Water. LB films are formed by immersion of a solid in to and/or out of the Langmuir film. Langmuir Schaefer are formed by stamping the Langmuir film on to the solid.
SAMS are monolayer films where the molecules organize themselves in to a pattern spontaneously.
The LB and SAM films are quite similar in structure, although the former is deposited in the form of a close-packed monolayer from the water interface, while the latter is self-organized on the metal surface from a solution, for example, long-tailed thiols (SAM) on the surface of a silver or gold substrate. In fact, the LB film can be considered as a SAM, since the molecules in the Langmuir film are self-organized in the process of deposition of a monolayer on a solid surface. An example is the self-organization of fatty acid molecules on the surface of mica during the deposition of a monolayer. Since SAM molecules have long tails, they can form LB films on the same substrates (silver, gold) SAM LB. But the quality of SAM LB (packing density) will be much higher than that of a monolayer of SAM from solution. We have developed a method for horizontal deposition of a monolayer on a solid surface. In this case, the deposition of an LB monolayer can be considered as a SAM monolayer, since, as a rule, the processes of self-organization of molecules in a monolayer are realized during the formation of LB films.
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