Design, Fabrication, and Characterization of Polythiophene Gate Electrode ChemFETs for Environmental Pollutant Sensing

Publication Date


Type of Culminating Activity


Degree Title

Master of Science in Electrical Engineering


Electrical and Computer Engineering

Major Advisor

Jeff Jessing


Water-borne pollutants such as volatile organic compounds are a serious environmental concern, which has increased the demand for chemical sensing elements. Solid-state sensors based on catalytic gate devices are a subject of current research; however they are restricted in practical applications because of their inability to operate at room temperature. Conducting polymer FETs, which employ a conducting gate polymer, have received much attention due to their unique electronic and optical properties. Polythiophene is chosen as the semi-conductive gate polymer in this work. A functional group attached to the polythiophene is used to detect analytes. (i.e. mercury in this work) of interest. The selectivity of the derivitized polythiophene to mercury can be rationalized based on the size of the ring, presence of oxygen and nitrogen donor atoms. In this work, the modeling, design, fabrication of a polythiophene gate electrode ChemFET will be discussed.

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