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9424523 
Meetings & Symposia 
Development of A Mems Chemical Sensor for Detection of Phthalates in Juice Using ElectroChemical Impedance Spectroscopy 
Tolouei, NE; Bhuiyan, MEK; Hankins, M; Shavezipur, M 
2020 
American Society of Mechanical Engineers (ASME) 
1 
English 
Presence of toxic chemicals in food products due to the use of different synthetic materials in food packages may cause longterm health hazard. Addition of chemical components such as phthalate family (for instance, Di(2-ethylhexyl) phthalate, DEHP) to plastics may result in diffusion of these materials in food specially in liquids such as bottled soft drink, water and juice. In this work, we present a chemical sensor that can detect DEHP in orange juice at extremely low concentrations. The sensor is made of two interdigitated electrodes, and electrochemical impedance spectroscopy (EIS) is used for the detection. Sensors with different overall dimensions and finger/gap sizes were fabricated using a polycrystalline silicon standard foundry. For simplification of the experiments, low concentration of citric acid in water (similar to orange juice) is used to represent the orange juice. The sensors are exposed to different concentrations of DEHP and their Nyquist and impedance-frequency plots are studied. The experimental data shows that the sensors can distinctly capture low concentrations of DEHP in the juice solution. An electrical model is developed that can simulate the frequency response of the system containing the sensor and the solution. The model includes dynamic physical parameters such as double-layer capacitance, solution resistance and Warburg impedance that can be used in detection. EIS curves fit to experimental data shows that the model well fits the experimental data. Copyright © 2020 ASME. 
Chemical contamination; Chemical detection; Chemical hazards; Chemical sensors; Citrus fruits; Curve fitting; Design; Electrochemical electrodes; Esters; Frequency response; Fruit juices; Health hazards; Nanosystems; Polycrystalline materials; Spectroscopy; Toxic materials; Di(2-ethylhexyl)phthalate; Double-layer capacitance; Electrical modeling; Inter-digitated electrodes; MEMS chemical sensors; Physical parameters; Solution resistance; Synthetic materials; Electrochemical impedance spectroscopy 
ASME 2020 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference 
Virtual, Online