On the dynamic and static manifestation of molecular absorption in thin films probed by a microcantilever

Finot, Eric; Fabre, Arnaud; Passian, Ali; Thundat, Thomas

doi:10.1103/PhysRevApplied.1.024001

On the dynamic and static manifestation of molecular absorption in thin films probed by a microcantilever

Journal Article · Thu Mar 27 04:00:00 EDT 2014 · Physical Review Applied

DOI:https://doi.org/10.1103/PhysRevApplied.1.024001· OSTI ID:1133557

Finot, Eric ^[1]; Fabre, Arnaud ^[2]; Passian, Ali ^[3]; Thundat, Thomas ^[4]

Univ. of Bourgogne, Dijon (France)
Commission for Atomic Energy (France)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Alberta, Edmonton, AB (Canada)

Mechanical resonators shaped like microcantilevers have been demonstrated as a platform for very sensitive detection of chemical and biological analytes. However, its use as an analytical tool will require fundamental understanding of the molecular absorption-induced effects in the static and dynamic sensor response. The effect of absorption-induced surface stress on the microcantilever response is here investigated using palladium hydride formation. It is shown that the resonance and deformation states of the cantilever monitored simultaneously exhibit excellent correlation with the phase of the hydride formation. However, the associated frequency shifts and quasistatic bending are observed to be independent during solid solution phase. Importantly, absorption-induced changes in the elastic parameters of the palladium film are found to play a dominant role in the static and dynamic response. The presented results help in discerning the parameters that control the cantilever response as well as the relationships between these parameters.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1133557

Journal Information:: Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 2 Vol. 1; ISSN 2331-7019

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

References (13)

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