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Self-assembling monolayers on SAW devices for selective chemical detection

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5 Author(s)
Ricco, A.J. ; Microsensor Dept., Sandia Nat. Labs., Albuquerque, NM, USA ; Kepley, L.J. ; Thomas, R.C. ; Li Sun
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The authors have utilized gold-coated, 98-MHz surface acoustic wave (SAW) devices on ST-cut quartz substrates to monitor in real time the self-assembly of organized alkanethiol monolayer films. The kinetics of assembly of these films indicate that the self-assembly process is dominated by the interaction between the thiol head group and the gold layer, rather than interactions between adjacent alkanethiol molecules. SAW devices modified with a self-assembled monolayer (SAM) of mercaptoundecanoic acid provide a response specific to the presence of organophosphonates (OPs) relative to water and a range of common volatile organic compounds (VOCs): the OP response is characteristic of increased mass loading of the device, while water and VOCs yield responses indicative of changes in the mechanical properties of the SAM film.<>

Published in:

Solid-State Sensor and Actuator Workshop, 1992. 5th Technical Digest., IEEE

Date of Conference:

22-25 June 1992

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