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Physical properties of porous titania films composed of nanoparticle aggregates

Published online by Cambridge University Press:  01 July 2006

Oluwatosin Ogunsola ,
Jinwon Park ,
Gil Lee  and
Sheryl Ehrman
Oluwatosin Ogunsola
Affiliation:
Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742
Jinwon Park
Affiliation:
School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907-2100
Gil Lee*
Affiliation:
School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907-2100
Sheryl Ehrman*
Affiliation:
Department of Chemical and Biomolecular Engineering, University of Maryland, College Park, Maryland 20742
*
a)Address all correspondence to these authors. e-mail: gl@ecn.purdue.edu
b)Address all correspondence to these authors. e-mail: sehrman@eng.umd.edu
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Abstract

Highly porous films of titania composed of nanoparticle aggregates were synthesized via gas-to-particle conversion and particle-precipitated chemical vapor deposition. The films were annealed in air for 12 h at temperatures ranging from 400 to 1000 °C. Atomic force microscopy was used to determine the Young's modulus and hardness of both the as-synthesized and annealed films. The Young's modulus and hardness of the as-synthesized films were 4.0 ± 0.4 MPa and 0.026 ± 0.003 MPa, respectively. There was no significant change in either modulus or hardness upon annealing until the films were annealed at a temperature of 1000 °C. The Young's modulus and hardness of these films were 56 ± 6 MPa and 0.10 ± 0.01 MPa, respectively. Results from dynamic light scattering measurements of aggregate size and surface area measurements suggest that annealing at 1000 °C leads to increased networking between distinct nanometer-scale titania aggregates, which strengthens the film.

Keywords

AnnealingHardnessPorosity
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 7 , July 2006 , pp. 1738 - 1746
Copyright
Copyright © Materials Research Society 2006

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