Formation of lead sulfide nanoparticles via Langmuir–Blodgett technique

Perovskite type thin films are constructed on hydrophilic quartz substrates from monolayers of long chain alkyl ammonium chloride on the subphase containing a mixture of Pb2+ and CH3NH3+ ions via Langmuir–Blodgett (LB) technique. The deposited film shows typical PbCl-based layered perovskite exciton absorption at about 331 nm. Lead sulfide nanoparticles are formed by reacting these films with H2S gas. UV–visible absorption spectroscopy and transmission electron microscopy are used respectively to observe the formation and morphology of the nanoparticles with sizes in the range of 10–30 nm. Obtained results indicate an effective way to prepare functional inorganic nanoparticles from regular layered structures.