STEPWISE GROWTH OF SIZE-CONFINED CDS IN THE 2-DIMENSIONAL HYDROPHILIC INTERLAYERS OF LANGMUIR-BLODGETT-FILMS BY THE REPEATED SULFIDATION-INTERCALATION TECHNIQUE

When a CdS-bearing stearic acid multilayer produced by exposing a cadmium stearate Langmuir-Blodgett (LB) film to H2S gas is immersed in aqueous CdCl2, Cd ions are intercalated to regenerate the cadmium stearate multilayer without the escape of CdS. The repetition of sulfidation-intercalation cycles allowed the size-quantized CdS to grow in a stepwise fashion in the hydrophilic interlayers. The layered structure was maintained throughout the repeated cycles, although the multilayer-constructing stearate molecules became less oriented by the formation and growth of CdS. The formation of a two-dimensional CdS plane was suggested.