2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

A compact, low-power cantilever-based sensor array for chemical detection

A. Loui, T.V. Ratto, T.S. Wilson, E.V. Mukerjee, Z-Y Hu, T.A. Sulchek and B.R. Hart
Lawrence Livermore National Laboratory, US

Keywords:
microcantilever, chemical sensor, polymers

Abstract:
A compact and low-power cantilever-based sensor array has been developed and used to detect various vapor analytes. This device employs sorptive polymers that are deposited onto piezoresistive cantilevers. We have successfully detected several organic vapors, representing a breadth of chemical properties and over a range of concentrations. Comparisons of the polymer/vapor partition coefficient to the cantilever deflection responses show that a simple linear relationship does not exist, emphasizing the need to develop an appropriate functional model to describe the chemical-to-mechanical transduction that is unique to this sensing modality.

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