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Proceedings Paper

PMN-PT single crystal resonators for ultra-sensitive vapor sensing
Author(s): Kee S. Moon; Yong K. Hong
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Paper Abstract

We report on an experimental comparison between PMN-PT single crystal resonators with commercially available QCM resonators showing significant superiority for new sensors over conventional quartz. Thickness acoustic mode resonators made out of PMN-PT film were fabricated for these tests. The thickness mode resonators make use of a mechanically polished PMN-PT single crystal film of thickness 30μm. The sensor response to methanol vapor condensation shows a frequency shift for the PMN-PT resonator 1000 times larger under the same environmental conditions than the commercial quartz microbalance sensor. A surface acoustic mode resonator using mechanically polished PMN-PT single crystal film of thickness 100μm was also fabricated and tested. The dimensions of the PZN-PT film sample were 5×2×0.12mm3. Thin gold interdigitated electrodes were applied on one side of the sample. A 50nm-thick gold film was evaporated on the surface and patterned using standard photolithography. This resonator sample also exhibits a resonance frequency similar to that of a commercial quartz microbalance sensor. A large frequency drop or sensitivity is again found for the PMN-PT sensors than the quartz sensors in this case. The frequency shift in the PMN-PT surface mode resonator is ~300 times larger to methanol vapor loading than in the quartz resonator.

Paper Details

Date Published: 5 December 2005
PDF: 7 pages
Proc. SPIE 6048, Optomechatronic Actuators and Manipulation, 60480C (5 December 2005); doi: 10.1117/12.650598
Show Author Affiliations
Kee S. Moon, San Diego State Univ. (United States)
Yong K. Hong, San Diego State Univ. (United States)

Published in SPIE Proceedings Vol. 6048:
Optomechatronic Actuators and Manipulation
Kee S. Moon, Editor(s)

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