AR2.3 - Design of an SH-SAW Sensor Array with High Sensitivity and Partial Selectivity Using Polymer-Plasticizer Coatings
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- Sensor Arrays 2
- Author(s)
- F. Josse, N. Post, K. Sothivelr, F. Bender - Dept. of El. & Comp. Engineering, Marquette University, Milwaukee, Wisconsin (USA), A. Ricco - Dept. of Electrical Engineering, Stanford University, Stanford, California (USA)
- Pages
- 266 - 267
- DOI
- 10.5162/IMCS2018/AR2.3
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
Coatings based on polymer-plasticizer blends for SH-SAW (shear-horizontal surface acoustic wave) sensor arrays are investigated for direct liquid-phase measurement. Based on a combination of Hansen solubility parameter analysis and previous experiments with different blend mixing ratios, polymers and plasticizers were selected to provide high sensitivity to BTEX compounds (benzene, toluene, ethylbenzene, xylenes) for each sensor device while maximizing array chemical diversity. The sensitivity of each coating/analyte combination was studied for a range of polymer-plasticizer mixing ratios. To characterize the chemical diversity in a given sensor array, the ratios of sensitivities of the coatings and the response time constants for each coating/analyte combination were compared. Guidelines for the design of an effective sensor array are discussed.