Abstract
Langmuir–Blodgett (LB) films were constructed on hydrophobic quartz substrates from monolayers of behenic acid on subphases containing only Cd 2+ or Hg 2+ and containing a mixture of Cd 2+ and Hg 2+ ions. The reaction of these films with H 2S to form metal sulphide particles was investigated using UV/visible spectroscopy and X-ray photoelectron spectroscopy (XPS). For the mixed metal ion system it was concluded that reaction with H 2S results in individual CdS and HgS particles forming rather than a mixed cadmium mercury sulphide. In order to investigate the kinetics of the H 2S reaction, the frequencies of MBe (M=Cd or Hg) coated quartz crystal microbalances were followed as a function of H 2S exposure time. Immersion of CdS particles into a Hg 2+ solution resulted in a change in the UV–visible absorbance spectrum attributed to the exchange of Cd 2+ ions in the particles for Hg 2+ ions most likely resulting in a HgS layer around the CdS core.
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