Abstract
The chemical state, composition and stability in air of monolayers of lead sulfide synthesized in stearic acid LB films at a H 2S pressure of 1 Torr were studied mainly by X-ray photoelectron spectroscopy (XPS). Its S/Pb ratio is about 1.5:1. In air, the lead sulfide monolayer slowly decomposes to PbSt 2, elemental sulfur and other sulfur compounds which escape in air in the form of H 2S or SO 2. After exposure to air for 77 days, the lead sulfide monolayer had decomposed about 90%, of which elemental sulfur is 62%.
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