Hybrid generalized ellipsometry and quartz crystal microbalance nanogravimetry for the determination of adsorption isotherms on biaxial metal oxide films

R. Alan May, David W. Flaherty, C. Buddie Mullins, Keith J. Stevenson

Research output: Contribution to journalArticle

Abstract

Generalized ellipsometry and quartz crystal nanogravimetry are combined to determine adsorption isotherms and changes in the optical properties of biaxial TiO2 thin films by monitoring changes in the Mueller matrix. Individual Mueller matrix elements, corresponding to a variety of polarization states, exhibit dramatically different sensitivities to the adsorption of toluene. While some elements are sensitive to structural anisotropy and orientation, others report uniquely on the refractive index. The fast (n a) optical axis reflects the greatest change in refractive index due to the adsorption, leading to a decrease from δn800nm = 0.4 to 0.1. This change is discussed in terms of the Bragg-Pippard (B-P) effective medium approximation, which is shown to accurately describe changes in optical behavior in response to adsorption. The integration of generalized ellipsometry with quartz crystal nanogravimetry establishes a highly sensitive technique for acquiring adsorption isotherms and for chemical optical sensing of structurally anisotropic thin films.

Original languageEnglish (US)
Pages (from-to)1264-1268
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume1
Issue number8
DOIs
StatePublished - Apr 15 2010
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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