Birhanu Desta Alemayehu



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Bisphenol A (BPA) is an important chemical used predominantly as a monomer in the production of polycarbonate plastics, epoxy resins and food packaging. BPA can migrate out of polycarbonate (packaging) and contaminate food and drinks. Intake of BPA is potentially toxic to human health, even at low concentrations. Hence, a device that can detect BPA at trace levels is needed. However, current analytical methods for BPA detection require sample pre-treatment steps, time consuming, expensive and cannot be performed on-site. We present the development of a portable, rapid, cost-effective and ultra-sensitive impedimetric biosensor to determine the concentration of BPA in drinking/ tap water at trace levels. 2D materials or Transition Metal Dichalcogenides (TMDCs) are used as conductive elements to fabricate electrodes/ films. Pulsed laser deposition is selected as thin film deposition technique due to the low temperatures involved and uniformity of the film, thus allowing deposition on any substrates. To enhance the sensitive and selectivity of the biosensor, the surface of the interdigitated electrode would be functionalized with enzyme. The ultimate goal of this work is to determine BPA at trace levels by analyzing the impedance spectrum of water diluted with different concentration of BPA over a range of frequencies and then publish the impedance data to a cloud computing interface where the data is logged and processed.

Publication Date


Project Designation

Graduate Research

Primary Advisor

Guru Subramanyam

Primary Advisor's Department

Electrical and Computer Engineering


Stander Symposium project, School of Engineering

United Nations Sustainable Development Goals

Clean Water and Sanitation; Good Health and Well-Being

A Portable Impedimetric Biosensor for Determination of Bisphenol A in Drinking Water