Opto-electrochemical based dual detection of heavy metal compounds using a novel flow cell

Author

Narakathu, Binu B. ; Reddy, Avuthu S. G. ; Eshkeiti, Ali ; Bazuin, Bradley J. ; Atashbar, Massood Z.

Author_Institution

Dept. of Electr. & Comput. Eng., Western Michigan Univ., Kalamazoo, MI, USA

fYear

2013

fDate

3-6 Nov. 2013

Firstpage

1

Lastpage

4

Abstract

An efficient sensing system that detects heavy metal compounds, by employing opto-electrochemical based dual detection technique, has been successfully developed. A novel microfluidic flow cell consisting of an inlet and outlet port with a reservoir volume of 25 μl was designed and fabricated using acrylic material. An electrochemical sensor with gold (Au) interdigitated electrodes (IDE) on a glass substrate was used for the electrical impedance spectroscopy (EIS) of various heavy metal compounds. EIS performed on cadmium sulfide (CdS) and mercury sulfide (HgS) yielded picomolar (pM) concentration detection levels. Selective detection of heavy metal compounds was made possible based on optical signals produced in the Raman emission spectra. The response of this dual detection sensing system is analyzed and presented in this paper.

Keywords

Raman spectra; cadmium compounds; electrochemical electrodes; electrochemical impedance spectroscopy; electrochemical sensors; gold; mercury compounds; microfluidics; optical sensors; Au; CdS; HgS; Raman emission spectra; SiO₂; acrylic material; electrical impedance spectroscopy; electrochemical sensor; glass substrate; gold interdigitated electrodes; heavy metal compounds; microfluidic flow cell; optical signals; opto-electrochemical based dual detection; picomolar concentration detection levels; Compounds; Gold; Impedance; Materials; Microfluidics; Sensors;

fLanguage

English

Publisher

ieee

Conference_Titel

SENSORS, 2013 IEEE

Conference_Location

Baltimore, MD

ISSN

1930-0395

Type

conf

DOI

10.1109/ICSENS.2013.6688337

Filename

6688337