Title :
SH-SAW-based sensor for heavy metal ion detection
Author :
Ramshani, Zeinab ; Narakathu, Binu B. ; Reddy, Avuthu S. G. ; Atashbar, Massood Z. ; Wabeke, Jared T. ; Obare, Sherine O.
Author_Institution :
Dept. of Electr. & Comput. Eng., Western Michigan Univ., Kalamazoo, MI, USA
Abstract :
In this study, a shear horizontal mode surface acoustic wave (SH-SAW) sensor, was designed and fabricated for the detection of heavy metals. The SH-SAW sensor was photolithographically fabricated by patterning gold (Au) interdigitated electrodes (IDE) and reflectors on the surface of a 64° YX-LiNbO3 based piezoelectric substrate. A flow cell, with a reservoir volume of 3 μl, which employs inlet and outlet ports for the microfluidic chamber and polydimethylsiloxane (PDMS) based microfluidic channels, was also designed and fabricated using acrylic material. Phenol and naphtho[2,3-a]dipyrido[3,2-h:2´3´-f] phenazine-5,18-dione (QDPPZ) were employed as the sensing layers for mercury and nickel ions, respectively. The frequency based response of the SH-SAW sensor demonstrated picomolar level detection for mercury nitrate (Hg(NO3)2) and nickel nitrate (Ni(NO3)2).
Keywords :
electrodes; gold; mercury (metal); metal detectors; microfluidics; nickel; polymers; surface acoustic wave sensors; Au; Hg; LiNbO3; Ni; SH-SAW-based sensor; acrylic material; flow cell; frequency based response; gold interdigitated electrodes; heavy metal ion detection; mercury ions; mercury nitrate; microfluidic chamber; microfluidic channels; naphtho[2,3-a]dipyrido[3,2-h:2´3´-f] phenazine-5,18-dione; nickel ions; nickel nitrate; phenol; photolithographically fabricated sensor; picomolar level detection; polydimethylsiloxane; reflectors; reservoir volume; shear horizontal mode surface acoustic wave sensor; Gold; Microfluidics; Nickel; Substrates; Surface acoustic waves; SH-SAW sensor; mercury; microfluidics; nickel;
Conference_Titel :
Frequency Control Symposium & the European Frequency and Time Forum (FCS), 2015 Joint Conference of the IEEE International
Conference_Location :
Denver, CO
Print_ISBN :
978-1-4799-8865-5
DOI :
10.1109/FCS.2015.7138901
