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

Published online by Cambridge University Press:  07 July 2015

Tiziana Di Luccio
Affiliation:
ENEA Agenzia Nazionale per le Nuove Tecnologie, l’Energia e lo Sviluppo Economico Sostenibile, UTTP NANO, P.le E. Fermi 1, 80055 Portici (Napoli), Italy California Institute of Technology, Division of Chemistry and Chemical Engineering,1200 E. California Blvd. Pasadena, CA 91125,U.S.A.
Dina Carbone
Affiliation:
ESRF European Synchrotron Radiation Facility, 71, avenue des Martyrs, 38000 Grenoble, France
Silvia Masala
Affiliation:
Solar and Photovoltaic Engineering Research Center, 4700 King Abdullah University of Science & Technology, Thuwal 23955-6900 Kingdom of Saudi Arabia
Karthik Ramachandran
Affiliation:
California Institute of Technology, Division of Chemistry and Chemical Engineering,1200 E. California Blvd. Pasadena, CA 91125,U.S.A.
Julie Kornfield
Affiliation:
California Institute of Technology, Division of Chemistry and Chemical Engineering,1200 E. California Blvd. Pasadena, CA 91125,U.S.A.
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Abstract

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 Å. 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).

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Articles
Copyright
Copyright © Materials Research Society 2015 

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