Synthesis of CdS nanocrystals in polymeric films studied by in-situ GID and GISAXS

TitleSynthesis of CdS nanocrystals in polymeric films studied by in-situ GID and GISAXS
Publication TypePresentazione a Congresso
Year of Publication2015
AuthorsDi Luccio, Tiziana, Carbone D., Masala S., Ramachandran K., and Kornfield J.
Conference NameMaterials Research Society Symposium Proceedings
PublisherMaterials Research Society
ISBN Number9781510826625
KeywordsCadmium sulfide, CdS nanocrystals, Crystal lattices, Crystalline peaks, Diffraction, Diffraction intensity, Grazing incidence diffraction, Grazing incidence small angle scatterings, Hexagonal lattice, Loss of symmetry, Nanocrystals, Polymer films, Thin films, Thin polymeric films

In this work, we describe the synthesis of CdS nanocrystals in thin polymeric films by in-situ Grazing Incidence Diffraction (GID) and Grazing Incidence Small Angle Scattering (GISAXS). The 2D GISAXS patterns indicate how the precursor structure is altered as the temperature is varied from 25°C to 300°C. At 150°C, the CdS nanocrystals start to arrange themselves in a hexagonal lattice with a lattice parameter of 27 A. The diffraction intensity from the hexagonal lattice reaches a maximum at 170"C and decreases steadily upon further heating above 220°C indicating loss of symmetry. Correspondingly, the GID scans at 170°C show strong crystalline peaks from cubic CdS nanocrystals that are about 2 nm size. The results indicate that a temperature of 170°C is sufficient to synthesize CdS nanocrystals without degradation of the polymer matrix (Topas) in thin films (about 30nm). © 2015 Materials Research Society.