Combined optical and acoustical method for determination of thickness and porosity of transparent organic layers below the ultra-thin film limit

K. B. Rodenhausen, T. Kasputis, A. K. Pannier, J. Y. Gerasimov, R. Y. Lai, M. Solinsky, T. E. Tiwald, H. Wang, A. Sarkar, T. Hofmann, N. Ianno, M. Schubert

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Analysis techniques are needed to determine the quantity and structure of materials composing an organic layer that is below an ultra-thin film limit and in a liquid environment. Neither optical nor acoustical techniques can independently distinguish between thickness and porosity of ultra-thin films due to parameter correlation. A combined optical and acoustical approach yields sufficient information to determine both thickness and porosity. We describe application of the combinatorial approach to measure single or multiple organic layers when the total layer thickness is small compared to the wavelength of the probing light. The instrumental setup allows for simultaneous in situ spectroscopic ellipsometry and quartz crystal microbalance dynamic measurements, and it is combined with a multiple-inlet fluid control system for different liquid solutions to be introduced during experiments. A virtual separation approach is implemented into our analysis scheme, differentiated by whether or not the organic adsorbate and liquid ambient densities are equal. The analysis scheme requires that the film be assumed transparent and rigid (non-viscoelastic). We present and discuss applications of our approach to studies of organic surfactant adsorption, self-assembled monolayer chemisorption, and multiple-layer target DNA sensor preparation and performance testing.

Original languageEnglish (US)
Article number103111
JournalReview of Scientific Instruments
Volume82
Issue number10
DOIs
StatePublished - Oct 1 2011

Fingerprint

Ultrathin films
Porosity
Quartz Crystal Microbalance Techniques
optics
porosity
Liquids
thin films
Surface-Active Agents
Adsorption
Spectroscopic ellipsometry
liquids
Quartz crystal microbalances
Self assembled monolayers
Adsorbates
Chemisorption
Light
DNA
Surface active agents
quartz crystals
microbalances

ASJC Scopus subject areas

  • Instrumentation

Cite this

Combined optical and acoustical method for determination of thickness and porosity of transparent organic layers below the ultra-thin film limit. / Rodenhausen, K. B.; Kasputis, T.; Pannier, A. K.; Gerasimov, J. Y.; Lai, R. Y.; Solinsky, M.; Tiwald, T. E.; Wang, H.; Sarkar, A.; Hofmann, T.; Ianno, N.; Schubert, M.

In: Review of Scientific Instruments, Vol. 82, No. 10, 103111, 01.10.2011.

Research output: Contribution to journalArticle

Rodenhausen, K. B. ; Kasputis, T. ; Pannier, A. K. ; Gerasimov, J. Y. ; Lai, R. Y. ; Solinsky, M. ; Tiwald, T. E. ; Wang, H. ; Sarkar, A. ; Hofmann, T. ; Ianno, N. ; Schubert, M. / Combined optical and acoustical method for determination of thickness and porosity of transparent organic layers below the ultra-thin film limit. In: Review of Scientific Instruments. 2011 ; Vol. 82, No. 10.
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