An amphiphilic oligomer, polymaleic acid with octadecanol monoester (PMAO), and its cadmium, lead and copper salts Langmuir-Blodgett (LB) films were prepared. These films possess an ordered structure as determined by X-ray diffraction measurements and FTIR spectroscopy. The long spacing of the films is 5.7 nm. After reaction with H2S, the long spacing increased to 5.8 nm, but an ordered structure was still kept. The nanoparticulate PbS, CdS and CuS multilayers were obtained. From the UV-vis spectrum, it was found that the nanoparticles within PMAO LB films show a larger blue shift of the optical absorption edge than that formed within the stearic acid LB film.