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Wafer-Scale Fabrication of Ultra-Long Polypyrrole Nanoribbons Using Lithographically Patterned Nanowire Electrodeposition

Nicha Chartuprayoon, Carlos M. Hangarter, Youngwoo Rheem, and Nosang V. Myung. Chemical and Environmental Engineering, University of California, Riverside, Bourns Hall A242, 900 University Ave., Riverside, CA 92521

One dimensional conducting polymer nanostructures such as polypyrrole (PPy) nanoribbons are of research interests due to their unique properties such as environmental stability, mechanical flexibility, biocompatibility, ion exchange capacity, and tunable electrical conductivity. In this work, polypyrrole nanoribbons were fabricated via newly developed Lithographically Patterned Nanowire Electrodeposition (LPNE) method. This method overcomes disadvantages of current techniques. High aspect ratio PPy nanoribbons can be synthesized to pre-determined locations on substrate with controlled thickness and width via top down “photolithography” and bottom up “electrodeposition”. PPy nanoribbons fabricated by LPNE ultimately can be used as useful nanodevices.

Based on the preliminary experimental results, PPy nanoribbons were fabricated on 4'' Silicon/Silicon Dioxide wafer with patterned gold electrode. The length of PPy nanoribbons were varied depending on the pattern. The thickness and width of PPy nanoribbons were fixed to 100 nm and 3 µm, respectively, with lengths of more than 1mm. Electrical transport properties of PPy nanoribbons were investigated by temperature dependent measurements. Liquid ion gated field effect studies and responses to ammonia vapor demonstrate strong potential for these devices as pH and gas sensors.