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(a) Fabricated flexible biosensor on PEN with AlN and Al electrode for better acoustic matching and reduced loss. (b) Surface adsorption of E. coli on the sensor surface at the IDT area. (c) Sensor frequency redshift with an increase in the number of bacteria [56]. Reproduced with permission from Leonardo Lamanna et al., Biosensors and Bioelectronics; published by Elsevier, 2020.
