Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 13, Issue 12, Pages 3026-3032Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b306590a
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A simple synthetic route with a direct self-assembling process was developed to synthesize sulfide semiconductor capped metal composite nanoparticles. Gold nanoparticles have been encapsulated with PbS nanocrystals to form spherical composite nanoparticles with core-shell structure. Stable Au@PbS composite colloids were prepared by thiourea, which acted as the linkage agent between Pb2+ ions and gold nanoparticles. The formation mechanism of Au@PbS composite nanoparticles was discussed and proved with FT-IR spectra. The PbS-capped gold composite nanoparticles which served as the building blocks were successfully integrated into BaTiO3 films. Significant enhancement of the femtosecond third-order nonlinear optical susceptibility in the Au@PbS nanoparticles with the core-shell structure was reported. To compare the effect of the enhanced nonlinear response, single gold and single PbS nanoparticles embedded in BaTiO3 films were also prepared.
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