Semiconductor nanoparticles were produced by exposing fatty acid salt Langmuir-Blodgett films to the atmosphere of H2S. Particles of different materials, such as CdS, PbS, MgS were formed and studied. Particle aggregation was used for producing thin semiconductor layers and superlattices. Alternating LB films of fatty acid salts with different metals were deposited, varying their thickness. Film structure was investigated by electron microscopy. The measurements revealed that semiconductor superlattices with different alternating layers were formed.