Title :
K+ detection using shear horizontal acoustic modes
Author :
Caliendo, C. ; Amico, A.D. ; Verardi, P. ; Verona, E.
Author_Institution :
CNR-Istituto di Acustica, Roma, Italy
Abstract :
An acoustic delay line sensor for the detection of potassium ion concentration in water has been implemented and tested. The device uses the propagation of shear horizontal (SH) waves in a piezoelectric plate (Love waves) in order to minimize acoustic energy loss in the liquid. One of the plate surfaces is covered with a polyvinyl-chloride-valinomycin membrane, a well-known ligand for the detection of potassium ions. The devices has shown a fairly good linearity of the response in the analyzed pK+ range of K+ concentration between 1.49 and 4. The operation is reversible and the response is highly reproducible. Measurements have demonstrated a high selectivity of the device with respect to exposure to Na+ solutions
Keywords :
Love waves; chemical analysis; detectors; surface acoustic wave devices; ultrasonic delay lines; K+ ion concentration detection; Love waves; SAW chemical sensor; SiO2; acoustic delay line sensor; pK+ range; piezoelectric plate; polyvinyl-chloride-valinomycin membrane; quartz substrate; response linearity; selectivity; shear horizontal acoustic modes; water; Acoustic devices; Acoustic propagation; Acoustic sensors; Acoustic signal detection; Acoustic testing; Acoustic waves; Biomembranes; Delay lines; Energy loss; Surface acoustic wave devices;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171392
