Improvement in carrier mobility of poly(3,4‐ethylenedioxythiophene) nanowires synthesized in porous alumina templates |
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| Authors: | Yasuhiro Shirai Seiichi Takami Soesan Lasmono Hideo Iwai Toyohiro Chikyow Yutaka Wakayama |
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| Institution: | 1. ICYS‐MANA, National Institute for Materials Science, Tsukuba, Ibaraki 305‐0044, Japan;2. Advanced Electronic Materials Center, National Institute for Materials Science, Tsukuba, Ibaraki 305‐0044, Japan;3. Materials Analysis Station, National Institute for Materials Science, Tsukuba, Ibaraki 305‐0044, Japan;4. Department of Chemistry and Biochemistry, Faculty of Engineering, Kyusyu University, Tsukuba, Ibaraki 305‐0044, Japan |
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| Abstract: | Polymeric nanowires of poly(3,4‐ethylenedioxythiophene) (PEDOT) are electrochemically synthesized using porous anodic alumina oxide (AAO) membranes as templates. Four‐point resistivity measurements on more than 100 PEDOT nanowires with different diameters (50–250 nm) reveal a statistically significant size‐dependent phenomenon in which the nanowires with a smaller diameter exhibit higher conductivity. Structural characterization with Raman spectroscopy and doping level estimation with energy‐dispersive X‐ray spectrometry and X‐ray photoelectron spectroscopy indicate that the observed conductivity enhancement can be attributed to improved carrier mobility in PEDOT nanowires having an elongated conjugation structure because of the effect of the AAO template. From the estimated doping levels (～5%) and conductivity data (～100 S/cm), it is found that the carrier mobility reach 2.0 cm2/V s for the nanowire with the smallest diameter, as compared with 4.0 × 10?4 cm2/V s for a bulk PEDOT film. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2011 |
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| Keywords: | anodic alumina oxide carrier mobility conductivity conjugated polymers high performance polymers nanowire poly(3 4‐ethylenedioxythiophene) templates |
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