Susanna Laurén Aug 30, ’22 < 3 min

What is a Langmuir-Blodgett film?

A Langmuir-Blodgett film (or LB film) can be defined as one or more monolayers of material deposited from a liquid surface onto a solid substrate by dipping the substrate through a floating monolayer at a constant molecular density. LB films are formed by one or several Langmuir films deposited onto a solid surface by vertical dipping of the solid substrate from the gas phase into the liquid phase (or vice versa). The name Langmuir-Blodgett comes from its two inventors Irvine Langmuir and Katharine Burr Blodgett.


Applications for Langmuir-Blodgett films

Langmuir-Blodgett technology enables the deposition of single- or multimolecular layers from a liquid surface onto a solid substrate with excellent film structure control. multiple-depositions LB is suited especially well for example for creating highly organized nanoparticle coatings. 
The films obtained by this process can be highly organized, ranging from ultrathin monolayers to multilayer structures built up of hundreds of monolayers.
Most typical applications of LB include creating highly organized and controlled nanoparticle coatings on solid substrates. These coatings can be used as an end product for instance in electronics, biomaterials, sensors, or functional surfaces.

What should be considered when producing Langmuir-Blodgett films?

Repeated deposition can be used to create well-organized multilayers on solid substrates. Several parameters affect the type of LB film produced. These include the nature of the spread film, the sub-phase composition, and temperature, the surface pressure during the deposition and the deposition speed, the type and nature of the solid substrate, and the time the solid substrate is stored in air or the sub-phase between the deposition cycles.
Density, thickness, and homogeneity properties are preserved when transferring the Langmuir film onto the substrate, allowing the construction of organized multilayer structures with varying layer compositions.

If you would like to learn more about Langmuir and Langmuir-Blodgett films and their applications, please register for the user event through the link below.


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