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Sensor responses of different SAW devices for 1000 ppm of toluene. All the devices are coated with the same recogntion layer i.e., permethylated β-cyclodextrin linked with hexafluorobenzene having a layer height of 60 nm, and the basic frequencies of the devices were 80, 301, 433 and 1000 MHz. Adapted with permission from [47], copyright (1998) Elsevier.
