The ionic complex between a cationic double-chain amphiphile and a decatungstate anion formed a well-organized multibilayer film, not only with keeping inherent properties of both the amphiphile and decatungstate anion almost intact but also with generating unique temperature dependence of the redox reaction regulated by the phase transition of bilayer.
PbS-bearing Langmuir-Blodgett (LB) films were synthesized by alternating the processes of sulfidation by the exposure to H2S gas and intercalation of Pb2+ ions. These processes allowed the in situ formation and growth of the nano-sized (quantum-state) PbS in the hydrophilic interlayers of the stearate LB film. The third-order nonlinear optical susceptibility, χ(3), of the quantum-state PbS embedded in the LB matrix was evaluated for the first time by third harmonic generation. The PbS/LB films showed the χ(3) values of the order of 10-12 esu, and the in situ growth of the quatum-state PbS resulted in the enhacement of χ(3).
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