A Langmuir-Blodgett film is a thin layer of material created by transferring a monolayer of molecules from a liquid surface onto a solid substrate. This technique allows for precise control over the film's thickness and composition, making it useful in various applications, including electronics and sensors. The process involves spreading amphiphilic molecules on the surface of water, where they arrange themselves into a monolayer. By slowly lowering a solid substrate into the water, the molecules adhere to the surface, forming a uniform film. This method is named after Irving Langmuir and Katharine Blodgett, who developed it in the early 20th century.