Date of Award

12-2011

Degree Name

Master of Science in Engineering

Department

Electrical and Computer Engineering

First Advisor

Dr. Massood Atashbar

Second Advisor

Dr. Bradley Bazuin

Third Advisor

Dr. Margaret Joyce

Access Setting

Masters Thesis-Campus Only

Abstract

A printed sensor was designed and fabricated, which was used for the detection of various biochemicals as well as humidity sensing. The sensor was fabricated on a flexible polyethylene terephthalate (PET) substrate. Silver (Ag) nano particle based ink was used as metallization for the printed interdigitated electrodes (IDE's), with 8 pair of electrodes and electrode dimensions of 8500 urn length, and 200 urn width and spacing. The capability of the printed sensor as an electrochemical sensor was evaluated for detecting varying concentrations of biochemicals like D-proline, sarcosine, mouse IgG, potassium chloride (KC1), cadmium sulphide (CdS) and lead sulfide (PbS) using electrochemical impedance spectroscopy (EIS) technique. The sensitivity and selectivity of the printed sensors were also studied as capacitive humidity sensors. A humidity sensitive polymer, poly (2-hydroxyethyl methacrylate) (pHEMA), was printed as the sensing layer by means of gravure printing process. The response behavior of the printed sensor as biosensor and humidity sensor is presented.

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