Result: Reliability of poly 3,4-ethylenedioxythiophene strain gauge
MIC-Department of Micro and Nanotechnology, Building 345 East, Danish Technical University, 2800 Kongens Lyngby, Denmark
Department of Chemical Engineering, Building 423, Danish Technical University, 2800 Kongens Lyngby, Denmark
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Further Information
We report on the experimentally observed reliability of the piezoresistive effect in strained poly 3,4-ethylenedioxythiophene (PEDT). PEDT is an intrinsic conductive polymer which can be patterned by conventional Cleanroom processing, and thus presents a promising material for all-polymer Microsystems. The measurements are made on microfabricated test chips with PEDT resistors patterned by conventional UV-lithography and reactive ion etching (RIE). We determine a gauge factor of 3.41 ± 0.42 for the strained PEDT and we see an increase in resistivity from 1.98 x 10-4 Ωm to 2.22 x 10-4 Ω m when the polymer is immersed in water for 30 min. The resistivity continues to increase to 2.66 x 10-4 Ω m when the resistor is thermally dried due to interactions with oxygen from the ambient. We measure the PEDT sheet resistance over a period of four weeks and see small fluctuations caused by humidity variations.