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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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