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Surface enthalpy and enthalpy of water adsorption of nanocrystalline tin dioxide: Thermodynamic insight on the sensing activity

Published online by Cambridge University Press:  15 March 2011

Yuanyuan Ma ,
Ricardo H.R. Castro ,
Wei Zhou  and
Alexandra Navrotsky
Yuanyuan Ma
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, California 95616
Ricardo H.R. Castro
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, California 95616
Wei Zhou
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, California 95616
Alexandra Navrotsky*
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, California 95616
*
a)Address all correspondence to this author. e-mail: anavrotsky@ucdavis.edu
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Abstract

Tin dioxide (SnO2) is an important base material for a variety of gas sensors and catalysts. However, there is a lack of experimental data on the energetics of SnO2 surfaces and their water adsorption. In this work, the surface energies of anhydrous and hydrated SnO2 nanoparticles were measured by combining high-temperature oxide melt solution calorimetry and water adsorption calorimetry. The SnO2 nanoparticles were synthesized through oxidation of metallic tin using nitric acid followed by heat treatment at different temperatures to achieve surface areas ranging from 4000 to 10,000 m2·mol−1(25–65 m2·g−1). The enthalpy of the anhydrous surface is 1.72 ± 0.01 J·m−2, and that of the hydrated surface is 1.49 ± 0.01 J·m−2. The integral heat of water adsorption is −75 kJ·mol−1, with a chemisorbed maximum coverage of ∼5 H2O·nm−2. SnO2 has a lower surface energy and less exothermic enthalpy of water adsorption than the isostructural TiO2 (rutile) reported previously. This comparison suggests that the excellent sensing properties of SnO2 may be a consequence of its relatively low affinity for surface H2O molecules that compete with other gases for adsorption.

Keywords

Oxide
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 7 , 14 April 2011 , pp. 848 - 853
Copyright
Copyright © Materials Research Society 2011

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