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Thermochemistry of nanoparticles on a substrate: Zinc oxide on amorphous silica

Published online by Cambridge University Press:  31 January 2011

Tatiana Y. Shvareva ,
Sergey V. Ushakov ,
Alexandra Navrotsky ,
Joseph A. Libera  and
Jeffrey W. Elam
Tatiana Y. Shvareva
Affiliation:
Peter A. Rock Thermochemistry Laboratory, University of California at Davis, Davis, California 95616
Sergey V. Ushakov
Affiliation:
Peter A. Rock Thermochemistry Laboratory, University of California at Davis, Davis, California 95616
Alexandra Navrotsky*
Affiliation:
Peter A. Rock Thermochemistry Laboratory, University of California at Davis, Davis, California 95616
Joseph A. Libera
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
Jeffrey W. Elam
Affiliation:
Argonne National Laboratory, Argonne, Illinois 60439
*
a)Address all correspondence to this author. e-mail: anavrotsky@ucdavis.edu
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Abstract

Crystalline samples of zinc oxide on a mesoporous amorphous silica substrate were prepared by 5 to 15 atomic layer deposition cycles with diethyl zinc and water at 150 °C. Samples were characterized by x-ray diffraction, thermogravimetry, and nitrogen adsorption–desorption isotherms. High-temperature oxide melt solution calorimetry and water adsorption calorimetry experiments were performed to measure surface enthalpy for crystalline ZnO particles supported on the substrate. The measured enthalpies 1.23 ± 0.35 and 2.07 ± 0.59 J/m2 for hydrous and anhydrous surfaces, respectively, are in agreement with previously reported measurements for unsupported ZnO nanoparticles. Feasibility of thermochemical characterization of complex system of atomic layer deposition (ALD) prepared particles on a substrate was demonstrated.

Keywords

Atomic layer depositionCalorimetryOxide
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 7 , July 2008 , pp. 1907 - 1915
Copyright
Copyright © Materials Research Society 2008

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References

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