Transistors and microfluidic devices for biosensor applications
- 1. Polymer based transistors & microfluidic devices for biosensor applicationsSenaka Krishna KanakamedalaAdvisor : Dr. Mark A DeCoster1Louisiana Tech University, Ruston, LA, USA
- 2. Introduction : Organic Electro Chemical Transistors (OECT) OECT : Low operating voltages , Aqueous environments & Simplified structure
- 3. Electrode materials : Gold, silver and platinum
- 4. Channel: Conducting polymers
- 5. Electrolyte solution for electrochemical reactionsGate (G)ElectrolyteSource (S)Drain (D)Polymer channel2
- 6. OECT with Optimized Dimensions3 Electrode & Channel material: PEDOT:PSS (conducting polymer)Fig: Schematic diagram of the OECT (top view)
- 7. OECT on Glass (left) & Polyester sheet (right)4Fabricated Transistors
- 8. Film Thickness = 200 nm5Surface roughness of the patterned filmFig: AFM image of the PEDOT:PSS film
- 9. Transistors Characteristics6Vds = Drain voltage, Ids = Drain current, and Vgs = Gate voltage
- 10. Glucose Sensor Response―Normalized ResponseI0 - IC=I0 I0 = Drain current before adding glucose
- 11. IC = Drain current after adding glucose (concentration of interest) 7
- 12. Developed Field Effect Transistors8 Two sensor devices on a single chip
- 13. Gold electrodes are separated by a narrow channel
- 14. Channel length = 50µm4.5 mm4.6 mm
- 15. 9OutletInlet 1Inlet 2Flexible disposable micromixerFig : Solid works model of the polymer micromixer (left), three layered polymer patterns constitute microchannel of the micromixer (right)
- 16. Fabricated flexible microfluidic devices10