A stretchable conductive Polypyrrole Polydimethylsiloxane device fabricated by simple soft lithography and oxygen plasma treatment
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This paper reports a simple method used to fabricate a stretchable conductive polypyrrole (PPy) rough pore-shape polydimethylsiloxane (p-PDMS) device. An abrasive paper is first used to imprint rough micro-structures on the SU-8 micromold. The p-PDMS microchannel is then fabricated using a standard soft-lithography process. An oxygen plasma treatment is then applied to form an irreversible sealing between the microchannel and a blank cover PDMS. The conductive layer is formed by injecting the PPy mixture into the microchannel which polymerizes in the rough pore-shape micro-structures; The PPy/p-PDMS hybrid device shows good electrical property and stretchability. The electrical properties of different geometrical designs of the PPy/p-PDMS microchannel under stretching were investigated, including straight, curved, and serpentine. Mouse embryonic fibroblasts (NIH/3 T3) were also cultured inside the PPy/p-PDMS device to demonstrate good biocompatibility and feasibility using the conductive and stretchable microchannel in cell culture microfluidics applications. Finally, cyclic stretching and bending tests were performed to evaluate the reliability of PPy/p-PDMS microchannel.
KeywordsPolypyrrole (PPy) Polydimethylsiloxane (PDMS) Microchannel Oxygen plasma treatment
The authors thank the Ministry of Science and Technology, Taiwan, and National Central University–Cathay General Hospital joint research program, for financially supporting this project under Grant No. MOST 105-2221-E-008-061, MOST 104-2911-I-008-514, and 105 CGH-NCU-A2. S.H Tan gratefully acknowledges the support of the Australian Research Council DECRA Fellowship (DE170100600), Griffith University-Peking University Collaboration Grant and Griffith University-Simon Fraser University collaborative grant.
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