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Demonstration of Semiconducting Polymers for Microsprings

This presentation demonstrates the use of semiconducting polymers for microsprings, highlighting their low cost, easy processing, excellent thermal stability, and flexibility. The application of conducting polymers in LEDs, transistors, optical devices, MEMS, drug delivery, and DLP technology will also be discussed.

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Demonstration of Semiconducting Polymers for Microsprings

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  1. Demonstration of Semiconducting Polymers for Microsprings Lilit Abramyan IMSURE Fellow Mentors: John LaRue (MAE) Richard Nelson (EECS)

  2. Polymers • Low cost • Easy processing • Excellent thermal stability • Flexibility

  3. Conducting Polymers • LEDs • Transistors • Optical devices • Micro-electro-mechanical systems • Drug delivery • DLP (Digital Light Processing)

  4. Motivation Image by Chang-hsiu Chen http://www.dlp.com/tech/what.aspx

  5. Plans • Thin films • Electrical properties • Equivalent circuit • Surface morphology • Young’s modulus

  6. Background Information • PEDOT poly(3,4-ethylenedioxythiophene) • Good conductor • Insoluble • PSS poly(styrenesulfonate) • Makes dispersion with PEDOT in water • PVA (polyvinyl alcohol) • Adds viscosity • Better mechanical properties

  7. PEDOT:PSS Baytron P (manufacturer-prepared) – conducting polymer NMP (N-Methyl-2-pyrrolidone) – conductivity enhancement Silquest – durability Isopropanol – reduce surface energy Dynol 604 – wetting agent Solutions

  8. Solutions (cont.) • Two separate solutions – PEDOT & PVA • Mix at different weight percentages

  9. Fabrication of Samples • Spin coat onto Silicon and glass • Silver epoxy contacts

  10. Resistance & Conductivity Thickness - profilometer Lower percentage of PEDOT → More PVA → More viscous → Thicker films ρ=resistivity R=resistance A=cross-sectional area L=length σ=conductivity L

  11. Transient Response • Pulse testing Sample on Silicon Sample on Glass

  12. R2 R3 1 2 1 2 R1 1 2 C2 C3 1 2 1 2 Initial Simulation Model

  13. Impedance Nyquist Plot Phase vs. Frequency

  14. Equivalent Circuit (Final Simulation Model)

  15. SEM (Scanning Electron Microscope) Images 100% PEDOT On glass 80% PEDOT On glass 50% PEDOT On silicon Soaked in water

  16. Resonant Frequency & Young’s Modulus • Vibrometer at Polytec (http://www.polytec.com)

  17. Acknowledgements • John LaRue • Richard Nelson • Allen Kine • Chang-hsiu Chen • Said Shokair • Urop & IM-SURE • National Science Foundation

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